Velocity

Velocity (pronounced vuh-los-i-tee)

(1) Rapidity of motion or operation; swiftness; a certain measurement of speed.

(2) In mechanics and physics, a measure of the rate of motion of a body expressed as the rate of change of its position in a particular direction with time.  It is measured in metres per second, miles per hour etc.

(3) In casual, non technical use, a synonym for speed.

1540-1550: From the Middle French vélocité, from the Latin velocitatem (nominative vēlōcitās) (swiftness; speed), from vēlōx (genitive velocis) (swift, speedy, rapid, quick) of uncertain origin.  It may be related either to volō (I fly), volāre (to fly) or vehere (carry) from the primitive Indo-European weǵh- (to go, move, transport in a vehicle) although some etymologists prefer a link with the Proto-Italic weksloks from the primitive Indo-European weg-slo-, a suffixed form of the root weg- (to be strong, be lively). Although in casual use, velocity and speed are often used interchangeably, their meanings differ.  Speed is a scalar quantity referring to how fast an object is moving; the rate at which an object covers distance.  Velocity is the rate at which an object changes position in a certain direction. It is calculated by the displacement of space per a unit of time in a certain direction. Velocity deals with direction, while speed does not.  In summary, velocity is speed with a direction, while speed does not have a direction.  Velocity is a noun; the noun plural is velocities.

Great moments in velocity stacks

Velocity stacks (also informally known as trumpets or air horns) are trumpet-shaped devices, sometimes of differing lengths, fitted to the air entry of an engine's induction system, feeding carburetors or fuel injection.  Velocity stacks permit a smooth and even flow of air into the intake tract at high velocities with the air-stream adhering to the pipe walls, a process known as laminar flow.  They allow engineers to modify the dynamic tuning range of the intake tract by functioning as a resonating pipe which can adjust the frequency of pressure pulses based on its length within the tract.  Depending on the length and shape of the stack, the flow can be optimized for the desired power and torque characteristics, thus their popularity in competition where the quest is often for top-end power but the flow can also be tuned instead to produce enhanced low or mid-range performance for specialized use.

1973 McLaren M20C.

The 1968 McLaren M8A was built for the Canadian-American Challenge Cup (the Can-Am) and used a new aluminum version (later sold for street use as the ZL1) of the 427 cubic inch (7.0 litre) big-block Chevrolet V8.  Dry sumped and fuel injected, it was rated at 625 bhp.  A series for unlimited displacement sports cars, the wonderful thing about the Can-Am was the brevity of the rules which essentially were limited to (1) enclosed body work and (2) two seats (one of which was close to a fake).  With engines eventually growing to 509 cubic inches (8.3 litres) and reaching close to 800 horsepower, the McLarens dominated the series for five years, their era ended only by the arrival of the turbo-panzers, the turbocharged Porsche 917s which in qualifying trim generated a reputed 1500 horsepower.  The McLarens remained competitive however, the final race of the 1974 series won by a McLaren  M20.    

1970 Ferrari 512S.

Ferrari built 25 512S models in 1969-1970 to comply with the FIA’s homologation rules as a Group 5 sports car to contest the 1970 International Championship for Makes.  It used a five-litre V12 and was later modified to become the 512M which, other than modified road cars, was the last Ferrari of the post-war era built for sports car racing, the factory instead focusing on Formula One.  Not until 2023 would Ferrari return to the Sports Car circuits, celebrated with victory in the Le Mans 24 hour endurance classic, the marque's first since winning with a 250 LM in 1965.  

1965 Coventry Climax FWMW flat-16 prototype.

Coventry Climax developed their FWMW between 1963-1965, intending it for use in Formula One.  A 1.5 litre flat-16, both the Brabham and Lotus teams designed cars for this engine but it was never raced and the engines never proceeded beyond the prototype stage.  Like many of the exotic and elaborate designs to which engineers of the era were attracted, the disadvantages imposed by the sheer bulk and internal friction were never overcome and the promised power increases existed in such a narrow power band it’s usefulness in competition was negligible.  Even on the test-benches it was troublesome, the torsional vibrations of the long crankshaft once destroying an engine undergoing testing.  It was Coventry at its climax; after the débacle of the FWMW, the company withdrew from Formula One, never to return.

1970 Porsche flat-16 prototype.

Porsche developed their flat-16 in the search for the power needed to compete with the big-capacity machines in the Can-Am series.  Unable further to enlarge their flat-12, their solution was to add a third more cylinders.  As an engine, it was a success and delivered the promised power but the additional length of the engine necessitated adding to the wheelbase of the cars and that upset their balance, drivers finding them unstable.  Porsche mothballed the flat-16 and resorted instead to forced-aspiration, the turbocharged flat-12 so effective that ultimately it was banned but not before it was tweaked to deliver a reputed 1500+ horsepower in Can-Am qualifying trim and, in 1975, at the Talladega raceway it was used to set the FIA closed course speed record at 221.160 mph (355.923 km/h); the mark stood for five years.  Had the 917 from the start been designed around a flat-16, it's history may have proved more remarkable still.

1966 Ford 289 V8 in GT40 Mk 1.

Not all the Ford GT40s had the photogenic cluster of eight velocity stacks.  When the Ford team arrived at Le Mans in 1966, their Mk II GT40s were fitted with a detuned version of the 427 cubic inch (7.0 litre) big-block FE engines used on the NASCAR circuits and instead of the multiple twin-choke carburetors with the velocity stacks familiar to the Europeans, it was fed by a single four barrel unit under a fairly agricultural looking air intake.  On the GT40s, the velocity stacks looked best on the 289 and 302 cubic inch (4.7 & 4.9 litre) small-block Windsor V8s, the ones built with the four downdraft Weber carburetors thought most charismatic and they're nicely complemented by the "bundle of snakes" exhaust systems.

1967 BRM H-16.

In typically English fashion, the 1949 BRM V16 is celebrated as a glorious failure.  In grand prix racing, it failed for many reasons but in one aspect, it was a great success: the supercharged 1.5 litre engine generated prodigious, if hard to handle, power.  Not discouraged, when a three litre formula was announced for 1966, BRM again found the lure of sixteen cylinders irresistible though this time, aspiration would be atmospheric.  It actually powered a Lotus to one grand prix victory in Formula One but that was its sole success.  Although nice and short, it was heavy and tall, the latter characteristic contributing to a high centre of gravity, exacerbated by the need to elevate the mounting of the block to make space for the exhaust system of the lower eight cylinders.  It was also too heavy and the additional power it produced was never enough to offset the many drawbacks.  Withdrawn from competition after two seasons and replaced by a more conventional V12, the FIA later changed the rules to protect BRM from themselves, banning sixteen cylinder engines.  Had BRM persisted, what was planned was four-valve head so the H-16's component count would have listed: 16 cylinders, 2 crankshafts, 8 camshafts, 2 distributers and 64 valves, making those who value intricacy porn most content.

1969 Ferrari 312P.

Build to comply with Group 6 regulations for prototype sports cars, the Ferrari 312 P was raced by the factory towards the end of the classic era for sports car racing which dated back to the early 1950s.  Fielded first with a three litre V12, it was re-powered with a flat-12 in 1971 and has often been described as the Ferrari Formula One car with bodywork and while a simplification, given the engineering differences between the two, that was the concept.  It appeared on the grid to contest the World Sportscar Championship in 1969, a return from a year of self-imposed exile after one of Enzo Ferrari's many arguments with the FIA.  Needing reliability for distance racing, the Formula One engine was slightly detuned and, as in the open wheeler on which it was based, acted as an integral load-bearing part of the structure.  Unlike Ferrari's earlier sports cars, this time the classic array of Webber carburetors was eschewed, the velocity stacks sitting atop Lucas mechanical fuel-injection.

Albert Einstein, Lindsay Lohan and velocity

Velocity plays is a critical component in Albert Einstein’s (1879-1955) Special (1905) & General (1915) Theories of Relativity which profoundly redined understanding of space, time, and gravity.  In the Special Theory of Relativity, there is an explanation of the perception of “simultaneity”: events simultaneous in one frame of reference may not be simultaneous in another frame moving at a different velocity.  The critical implication of this was that time was absolute but depends on the relative motion of observers.  This means a moving clock runs slower than one which is static (relative to the observer).  History’s second most quoted equation (number one said to be “2+2=4” although this is contested) is Einstein’s expression of mass-energy equivalence (E=mc²) which shows that mass and energy are interchangeable.  The significance in that of velocity is that as an object's velocity approaches the speed of light, its relativistic mass increases, requiring more energy to continue accelerating.  From this Einstein deduced the speed of light was the “universal speed limit” because for this eventually to be exceeded would require the input of an infinite amount of energy.  Whether such a state might have been possible in the first fraction of a second during the creation of the current universe remains a matter of speculation but as it now exists, the limit remains orthodox science although, for certain purposes, it is possible usefully to construct a model of the universe where, in a sense, "everything is happening at the same time", an abstraction which, paradoxically, is often used to illustrate why it's wrong.  This "everything is happening at the same time" model differs from one in which time doesn't exist: in such a place, everything would have to happen at once.     

The role of velocity in the General Theory of Relativity remains fundamental but is more complex still.  In addition to the dilation of time sue to relative motion, there is also “Gravitational Time Dilation” (due to relative motion, gravity itself causes time to dilate).  Objects moving in strong gravitational fields experience time more slowly than those existing in weaker fields.  Radically, what Einstein did was explain gravity not as a force (which is how we experience it) but as a curvature of space-time caused by the effects of mass & energy and the motion (and thus the velocity) of objects is is influenced by this curvature.  The best known illustration of the concept is that of “Geodesic Motion”: In curved space-time, a free-falling object moves along a geodesic path (the straightest possible between the points of departure & arrival). The velocity of an object influences its trajectory in curved space-time, and this motion is determined by the curvature created by mass-energy.

Two of Lindsay Lohan’s car most publicized car accidents.  All else being equal (which, as Albert Einstein would have explained, probably can’t happen), if an object is travelling at a higher velocity (in the casual sense of "speed"), the damage will be greater.  In these examples, at the point of impact, the Porsche 911 (997) CarreraS (2012, left) was travelling at a higher velocity than the Mercedes-Benz SL 65 AMG roadster (2005, right).

In classical (pre-Einstein) mechanics, the explanation would have been an object traveling at a higher velocity would have its kinetic energy increase quadratically with velocity (ie double the velocity and the kinetic energy increases by a factor of four.  In relativistic physics, as an object's velocity approaches the speed of light, its relativistic mass increases with velocity and relativistic mass contributes to the object's total energy.  For velocities much less than the speed of light (non-relativistic speeds (a car, even with Lindsay Lohan behind the wheel)), the increase in mass is negligible, and the primary difference is the increase in kinetic energy which follows the classical equation.  However, at velocities approaching the speed of light, both the kinetic energy and the relativistic mass increase significantly.  In a car crash, the main determinate of an impact's severity (and thus the damage suffered) is the kinetic energy:  A car traveling at a higher velocity will have significantly more kinetic energy, so any impact will be more destructive; the kinetic energy is determined by the square of the velocity meaning small a small increase in velocity results in a large increase in energy.  So, on the road, it’s really all about energy because the velocity attainable (relative to what’s going to be hit) means any increase in mass is going to be negligible.  However, were a car to be travelling at close to the speed of light the relativistic mass greatly would be increased, further contributing to the energy of the crash and making things worse still.

Virtual

Virtual (pronounced vur-choo-uhl)

(1) Being as specified in power, force, or effect, though not actually or expressly such; having the essence or effect but not the appearance or form.

(2) In optics, of an image (such as one in a looking glass), formed by the apparent convergence of rays that are prolonged geometrically, but not actually (as opposed to a real image).

(3) Being a focus of a system forming such images.

(4) In mechanics, pertaining to a theoretical infinitesimal velocity in a mechanical system that does not violate the system's constraints (applied also to other physical quantities); resulting from such a velocity.

(5) In physics, pertaining to a theoretical quality of something which would produce an observable effect if counteracting factors such as friction are disregarded (used often of the behavior of water if a factor such as friction were to be disregarded.

(6) In physics, designating or relating to a particle exchanged between other particles that are interacting by a field of force (such as a “virtual photon” and used also in the context of an “exchange force”).

(7) In digital technology, real, but existing, seen, or happening online or on a digital screen, rather than in person or in the physical world (actually an adaptation of an earlier use referring to political representation).

(8) In particle physics, pertaining to particles in temporary existence due to the Heisenberg uncertainty principle.

(9) In quantum mechanics, of a quantum state: having an intermediate, short-lived, and unobservable nature.

(10) In computing (of data storage media, operating systems, et al) simulated or extended by software, sometimes temporarily, in such a way as to function and appear to the user as a physical entity.

(11) In computing, of a class member (in object-oriented programming), capable of being overridden with a different implementation in a subclass.

(12) Relating or belonging to virtual reality (once often used as “the virtual environment” and now sometimes clipped to “the virtual”) in which with the use of headsets or masks, experiences to some degree emulating perceptions of reality can be produced with users sometimes able to interact with and change the environment.

(13) Capable of producing an effect through inherent power or virtue (archaic and now rare, even as a poetic device).

(14) Virtuous (obsolete).

(15) In botany, (literally, also figuratively), of a plant or other thing: having strong healing powers; a plant with virtuous qualities (obsolete).

(16) Having efficacy or power due to some natural qualities; having the power of acting without the agency of some material or measurable thing; possessing invisible efficacy; producing, or able to produce, some result; effective, efficacious.

1350–1400: From the Middle English virtual & virtual (there were other spellings, many seemingly ad hoc, something far from unusual), from the Old French virtual & vertüelle (persisting in Modern French as virtuel), from their etymon Medieval Latin virtuālis, the construct being the Classical Latin virtū(s) (of or pertaining to potency or power; having power to produce an effect, potent; morally virtuous (and ultimately the source of the modern English “virtue” from the Latin virtūs (virtue)) + -ālis.  The Latin virtūs was from vir (adult male, man), ultimately from the primitive Indo-European wihrós (man) (the construct of which may have been weyh- (to chase, hunt, pursue) + -tūs (the suffix forming collective or abstract nouns)).  The –alis suffix was from the primitive Indo-European -li-, which later dissimilated into an early version of –āris and there may be some relationship with hel- (to grow); -ālis (neuter -āle) was the third-declension two-termination suffix and was suffixed to (1) nouns or numerals creating adjectives of relationship and (2) adjectives creating adjectives with an intensified meaning.  The suffix -ālis was added (usually, but not exclusively) to a noun or numeral to form an adjective of relationship to that noun. When suffixed to an existing adjective, the effect was to intensify the adjectival meaning, and often to narrow the semantic field.  If the root word ends in -l or -lis, -āris is generally used instead although because of parallel or subsequent evolutions, both have sometimes been applied (eg līneālis & līneāris).  The alternative spellings vertual, virtuall and vertuall are all obsolete.  Virtual is a noun & adjective, virtualism, virtualist, virtualism, virtualness, virtualization (also as virtualisation) & virtuality are nouns, virtualize (also as virtualise) is a verb and virtually is an adverb; the noun plural is virtuals.  The non virtualosity is non-standard.

The special use in physics (pertaining to a theoretical infinitesimal velocity in a mechanical system that does not violate the system’s constraints) came into English directly from the French.  The noun use is derived from the original adjective.  Virtual is commonly used in the sense of being synonymous with “de facto”, something which can now be misleading because “virtue” has become so associated with the modern use related to computing.  In the military matters it has been used as “a virtual victory” to refer to what would by conventional analysis be thought a defeat, the rationale being the political or economic costs imposed on the “winner” were such that the victory was effectively pyrrhic.  It was an alternative to the concept of “tactical defeat; strategic victory” which probably was a little too abstract for some.

"Virtual art galleries" range from portals which enable works to be viewed on any connected device to actual galleries where physical works are displayed on screens or in some 3D form, either as copies or with a real-time connection to the original.   

In computing, although “virtual reality” is the best known use, the word has for some time been used variously.  “Virtual memory” (which nerds insist should be called “virtual addressing” is a software implementation which enables an application to use more physical memory than actually exists.  The idea dates from the days of the early mainframes when the distinction between memory and storage space often wasn’t as explicit as it would later become and it became popular in smaller systems (most obviously PCs) where at a time when the unit cost of RAM (random access memory) hardware was significantly higher than the default storage media of the HDD (hard disk drive).  Behaving as static electricity does, RAM was many orders of magnitude faster than the I/O (input/output) possible on hard disks but allocating a portion of free disk space to emulate RAM (hence the idea “virtual memory”) did make possible many things which would not run were a system able to work only with the installed physical RAM and rapidly it became a mainstream technique.

There’s also the VPN (virtual private network), a technology which creates a secure and encrypted connection over a public network (typically the Internet) and use is common to provide remote access to a private network or to establish a secure tunnel between two networks using the internet for transport.  The advantage of VPNs is they should ensure data integrity and confidentiality, the two (or multi) node authentication requirement making security breaches not impossible but less likely.  Widely used by corporations, VPNs are best known as the way traditionally used to evade surveillance and censorship in certain jurisdictions as diverse as the PRC (People’s Republic of China), the Islamic Republic of Iran and the UK although this is something of an arms race, the authorities with varying degrees of enthusiasm working out way to defeat the work-arounds.  VPNs often use an IP tunnel which is a related concepts but the IP tunnel is a technique used to encapsulate one type of network packet within another type of network packet to transport it over a network that wouldn't normally support the type of packet being transported.  IP tunnels are particularly useful in connecting networks using different protocols and (despite the name), the utility lies in them being able to transport just about any type of network traffic (not just IP).  A modular technology, not all IP tunnels natively provide authentication & encryption but most support “bolt-ons” which can add either or both.  So, while all VPNs use some form of tunnelling (however abstracted), not all tunnels are VPNs.

Microsoft really wanted you to keep their Java Virtual Machine.

Then there are “virtual machines”.  In personal computing, the machine came quickly to be thought of as a box to which a monitor and keyboard was attached and originally it did one thing at a time; it might be able to do many things but not simultaneously.  That situation didn’t long last but the idea of the connection between one function and one machine was carried over to the notion of the “virtual machine” which was software existing on one machine but behaving functionally like another.  This could include even a full-blown installation of the operating systems of several servers running on specialized software (sometimes in conjunction with hardware components) on a singles server.  What made this approach practical was that it is not unusual for a server to be under-utilized for most of its life (critically components often recording 2-3% utilization for extended periods, thus the attraction of using one physical server rather than several.  Obviously, the economic case was also compelling, the cost savings of having one server rather than a number multiplied by reductions in electricity use, cooling needs, insurance premiums and the rent of space.  There was also trickery, Microsoft’s JVM (Java Virtual Machine) an attempt to avoid having to pay licensing fees to Sun Microsystems (later absorbed by Oracle) for the use of a Java implementation.  The users mostly indifferent but while the hardware was fooled, the judges were not and the JVM was eventually declared an outlaw.

Operating a computer remotely (there are few ways to do this) rather than physically being present is sometimes called “virtual” although “remote” seems to have been become more fashionable (the form “telecommuting” used as early as 1968 is as archaic as the copper-pair analogue telephone lines over which it was implemented although “telemedicine” seems to have survived, possibly because in many places voice using an actual telephone remains a part).  In modern use (and the idea of virtual as “not physically existing but made to appear by software” was used as early as 1959), there are all sorts of “virtuals” (virtual personal trainers, virtual assistants et al), the idea in each case is that the functionality offered by the “real version” of whatever is, in whole or in part, emulated but the “virtual version”, the latter at one time also referred to as a “cyberreal”, another word from the industry which never came into vogue.  “Virtual keyboards” are probably the most common virtual device used around the world, now the smartphone standard, the demise of the earlier physical devices apparently regretted only by those with warm memories of their Blackberries.  Virtual keyboards do appear elsewhere and they work, although obviously offer nothing like the tactile pleasure of an IBM Model M (available from ClickyKeyboards.com).  The idea of “a virtual presence” is probably thought something very modern and associated with the arrival of computing but it has history.  In 1766, in the midst of the fractious arguments about the UK’s reaction to the increasing objections heard from the American colonies about “taxation without representation” and related matters (such as the soon to be infamous Stamp Act), William Pitt (1708-1778 (Pitt the Elder and later Lord Chatham); UK prime-minister 1766-1768) delivered a speech in the House of Commons.  Aware his country’s government was conducting a policy as inept as that the US would 200 years on enact in Indochina, his words were prescient but ignored.  Included was his assertion the idea of “…virtual representation of America in this house is the most contemptible idea that ever entered into the head of man and it does not deserve serious refutation.”  However, refute quite seriously just about everything his government was doing he did.  Pitt’s use of the word in this adjectival sense was no outlier, the meaning “being something in essence or effect, though not actually or in fact” dating from the mid-fifteenth century, an evolution of the sense of a few decades earlier when it was used to mean “capable of producing a certain effect”.  The adverb virtually was also an early fifteenth century form in the sense of “as far as essential qualities or facts are concerned while the meaning “in effect, as good as” emerged by the early seventeenth.

Lindsay Lohan's 2021 predictions of the US$ value of Bitcoin (BTC) & Ethereum (ETH).  By April 2024 the trend was still upward so the US$100,000 BTC may happen.  

In general use, the terms “cybercurrency”, “cryptocurrency” & “virtual currency” tend to be used interchangeably and probably that has no practical consequences, all describing electronic (digital) “currencies” which typically are decentralized, the main point of differentiation being that cryptocurrencies claim to be based on cryptographic principles and usually limited in the volume of their issue (although the decimal point makes this later point of little practical significance)  Whether they should be regarded as currencies is a sterile argument because simultaneously they are more and less, being essentially a form of gambling but for certain transactions (such as illicit drugs traded on various platforms), they are the preferred currency and in many jurisdictions they remain fully convertible and it’s telling the values are expressed almost always in US$, “cross-rates” (ie against other cryptocurrencies) rarely quoted.  However, to be pedantic, a “virtual currency” is really any not issued by a central government or authority (in the last one or two centuries-odd usually a national or central bank) and they can include in-game currencies, reward points and, of course, crybercurrencies.  The distinguishing feature of a cryptocurrency is the cryptotography.

Although the term is not widely used, in Christianity, "virtuality" was the view that contrary to the Roman Catholic doctrine of transubstantiation, the bread & wine central to Holy Communion do not literally transform into flesh and blood but are the medium or mechanism through which the spiritual or immaterial essence of the flesh and blood of Jesus Christ are received.  Within the Church, those who espoused or adhered to the heresy of virtuality were condemned as "virtualists.  In philosophy, the concept of virtuality probably sounds something simple to students but of course academic philosophy has a “marginal propensity to confuse”, the important distinction being “virtual” is not opposed to “real” but instead to “actual”, “real” being opposed to “possible”.

Afterburner

Afterburner (pronounced af-ter-bur-ner)

(1) In aviation, a device placed within, or attached to the exit of, a jet-engine exhaust pipe to produce afterburning.

(2) In engineering, a device in the exhaust system of an internal-combustion engine for removing or rendering harmless potentially dangerous components in the exhaust gases.

1948: A compound word, the construct being after + burn +-er.  The verb after developed from its use as an adverb and preposition, from the Middle English after-, efter- & æfter-, from the Old English æfter- (after, behind, against; later in time; in pursuit, following with intent to overtake), the idea being off + -ter (a comparative suffix), the original formation meant "more away, farther off”.  It was cognate with the Scots efter-, the Old Frisian & West Frisian efter-, the Dutch achter-, the German after-, the Swedish efter, the Old Norse eptir, the Old High German aftar, the Gothic aftra (behind), the Greek apotero (farther off) and the Old Persian apataram (further).  From circa 1300 it assumed the meaning "in imitation of; in the style of" while, as a conjunction in the sense of "subsequent to the time that" the use was inherited from the late Old English.  The phrase “after hours” (hours after regular working hours) dates from 1814 although the exact purpose has always proved elusive but it’s assumed by most to relate to retail commerce rather than terms of employment.  Afterwit was from circa 1500 and deconstructs literally as "wisdom that comes too late" but is familiar feeling of one for whom a perfect piece of repartee comes to mind only after the moment has passed; it’s perhaps surprising afterwit didn’t endure in the language.  The phrase “after you” an element in etiquette meaning “yielding precedence to another” dates from 1650.

Burn was from the Middle English bernen & birnen, from the Old English birnan (to burn), a metathesis from the Proto-West Germanic brinnan, from the Proto-Germanic brinnaną (to burn), from the primitive Indo-European bhrenw- and related to the Middle Irish brennim (drink up) & bruinnim (bubble up), the present stem from bhrewh- & bhru- (linked to the Middle Irish bréo (flame), the Albanian burth, the Cyclamen hederifolium (mouth burning) and the Sanskrit भुरति (bhurati) (moves quickly, twitches, fidgets).  The verb was from the early twelfth century brennen (be on fire, be consumed by fire; be inflamed with passion or desire, be ardent; destroy (something) with fire, expose to the action of fire, roast, broil, toast; burn (something) in cooking) which when applied to objects imparted the sense of “to shine, glitter, sparkle, glow like fire”, the form from both the Old Norse brenna (to burn, light) an two originally distinct Old English verbs: the transitive bærnan (to kindle) and the intransitive beornan (be on fire).  All of these were from the Proto-Germanic brennanan (causative brannjanan), source also of the Middle Dutch bernen, the Dutch branden, the Old High German brinnan, the German brennen, the Gothic brannjan (to set on fire); the ultimate etymology uncertain.  The noun burn dates from circa 1300 in the sense of "act or operation of burning” and was from the Old English bryne, the etymology identical to the verb and prior to the mid-sixteenth century, the usual spelling was brenne.

The Figurative use of burn (of passion, conflict etc.) was in Old English and survives to this day while the literal sense of "be hot, radiate heat" was from the later thirteenth century, the meaning "produce a burning sensation, sting" from a hundred years later.  A further figurative sense, that of "being cheated, swindled or victimized" emerged in the 1650s on the notion that whatever one lost “may as well have been burned”.  The slang use of burned from the late eighteenth century meaning "infected with venereal disease" referred to the sensation which was one of the symptoms.  To “burn one's bridges (behind one)” meant "behave so as to destroy any chance of returning to a status quo" and was used in the late nineteenth century, perhaps because of some of the reckless cavalry operations documented during the US Civil War although it’s a variation on the “burn the boats” (so one’s soldiers have no alternative but to fight, there being no chance of escape) approach known since Antiquity.  To have money “burn a hole in (one's) pocket” was a critique from the 1850s of those with an irresistible propensity to spend whatever money was in one’s possession; the modern expression of economists is of “expenditure rising to meet income”.  The meaning "mark or injury made by burning" is from 1520s while “slow burn” dates from 1938 and refers to a technique in acting.

The –er suffix was from the Middle English –er & -ere, from the Old English -ere, from the Proto-Germanic -ārijaz, thought usually to have been borrowed from Latin –ārius and reinforced by the synonymous but unrelated Old French –or & -eor (the Anglo-Norman variant was -our), from the Latin -(ā)tor, from the primitive Indo-European -tōr.  The –er suffix was added to verbs to create a person or thing that does an action indicated by the root verb; used to form an agent noun.  If added to a noun it usually denoted an occupation.

The afterburner

Attracted by theoretical work which hinted at improved thrust, Rolls-Royce began ground tests on one of their early jet engines in 1944 although the war ended before the technology was ready for production.  By the early 1950s, most advanced jet fighters had adopted afterburners and they continue generally to be used mostly in military aircraft although a few civilian applications have existed including the now defunct Tupolev Tu-144 and Concorde.

An afterburner’s purpose is to provide an increase in thrust, usually for supersonic flight, takeoff and in combat. Afterburning is achieved by injecting additional fuel downstream of the turbine and produces significantly increased thrust; the trade-off being very high fuel consumption and inefficiency, though this is considered acceptable for the short periods during which it is usually used.  The quantum of a jet-engine’s thrust is determined by the general principle of mass flow rate and thrust depends on two things: the velocity of the exhaust gas and the mass of that gas. A jet engine can produce more thrust by either accelerating the gas to a higher velocity or by having a greater mass of gas exit the engine.  Designing a basic turbojet engine around the second principle produces the turbofan engine, which creates slower gas but more of it. Turbofans are highly fuel efficient and can deliver high thrust for long periods, but the design trade-off is a large size relative to the power output. To generate increased power with a more compact engine for short periods, an engine requires an afterburner. The afterburner increases thrust primarily by accelerating the exhaust gas to a higher velocity.

Lockheed SR-71 Blackbird afterburning for additional thrust during take-off (left) and Royal Australian Air Force (RAAF) General Dynamics F-111 Aardvark performing a dump-and-burn (right).

What many people think of as afterburners are actually displays of dump-and-burn at air shows, a procedure where dumped fuel is intentionally ignited using the plane's afterburner. A spectacular flame combined with high speed makes this an interesting sight but it’s just for entertainment.  Fuel dumping is used to reduce the mass of an aircraft about to undertake emergency landings and thus, for other than for safety reasons, dump and burn has no practical use.  In the slang of pilots who flew the early generation of fighters with afterburners the phrase was "lit up the burners" while the dump and burn is also called a "torching" or a "zippo".

Lighting up the burners: Lindsay Lohan in The Canyons (2013).

Flak

Flak (pronounced flak)

(1) Ground-based anti-aircraft fire using explosive shells.

(2) In casual use, criticism; hostile reaction; abuse.

1938: From the German Flak (anti-aircraft gun), condensed from Fliegerabwehrkanone (literally "air defense gun"), the acronym deconstructed from Fl(ieger) + a(bwehr) + k(anone).  The sense of "anti-aircraft fire" became generalized in English from 1940 and the flak jacket is attested from 1956.  The metaphoric sense of "criticism" is American English circa 1963.  The synonym (and military verbal shorthand) is ack-ack, which appears to have developed independently in the German and allied military, the former using (from 1939) acht-acht (eight-eight) as an informal reference to the 88mm canon, the later being World War I (1914-1918) signalers' phonetic spelling of "AA".  Jargon has its own life and even after the NATO Phonetic Alphabet was standardized in 1956, ack-ack was so distinctive and well-known there was no suggestion it should be replaced by alpha-alpha. 

Lindsay Lohan in flak jacket.

The homophone flack (public relations spokesman) was first noted in US use in 1945, initially as a noun but, almost immediately became also a verb and it’s always had the sense of handling adverse criticism; if necessary by lying ("taking the flak" as it were).  The origin is murky; there’s a suggestion it was coined at entertainment industry magazine Variety but the first attested use was in another publication.  Flack was said to have emerged because of a coincidence in existence between flak being used to describe criticism (analogous with anti-aircraft fire) and a certain Mr Flack, said to be a public relations spokesman in the movie business but, given the accepted etymology, most regards this as an industry myth.

The 88mm Flak Canon

Panzer VI (Tiger Tank 1) with 88mm canon, Sicily, 1943.

The German 88 mm anti-aircraft canon was developed during the 1930s and was one of the most versatile and widely used weapons of World War II (1939-1945), deployed as field artillery, in anti-aircraft batteries, in ground assault and anti-tank roles and, on the larger tanks, as canon.  The naval 88, although the same caliber, was an entirely different weapon, dating from 1905.

88mm Flak Gun, Russia, 1941.

However, its stellar reputation belied to some extent, latter-day battlefield reality.  Like much mass-produced German weaponry of World War II, the 88 lost some of its comparative advantage as the allies’ quantitative and (with a few notable exceptions, especially in jet and rocket propulsion) qualitative superiority in materiel became apparent.  As an anti-aircraft gun, the Flak 88 needed high muzzle velocity to reach the altitudes at which bombers flew (20,000+ feet (6000+m)) and to achieve that the projectile itself was relatively small.  The high velocity made the Flak 88 a formidable anti-tank weapon, but did limit its effectiveness as field artillery.  Right to the end however, it remained a potent force wherever the terrain was suitable.

Zoo Flak Tower, Berlin, 1945.

One place the Flak 88s weren’t used was on the three huge concrete structures in Berlin called the Flak Towers.  Because the newer British and US bombers flew at higher altitudes, the bigger 128 mm canon was required.

The best known of the structures was the Berlin Zoo Flak Tower (Flakturm Tiergarten), the construction of which was induced by the Royal Air Force’s (RAF) first bombing raids on the city in August 1940.  Even by the standards of the time, these attacks were small-scale and of no obvious military value but, like the raid on Tokyo staged by the US in 1942 and the seemingly quixotic cross-border incursions by forces of indeterminate origin probing Russia’s “special military operation”, they compelled a disproportionately large re-allocation of civilian and military resources.  Early in the war, Hermann Göring (1893–1946; leading Nazi 1922-1945 and Reichsmarschall 1940-1945) in his capacity as head of the air force (Luftwaffe) had been asked if the industrial Ruhr was at risk of being bombed and he assured the nation: “No enemy bomber can reach the Ruhr… if one reaches the Ruhr, my name is not Göring. You can call me Meyer.”  The Reichsmarschall might have believed his own publicity but the RAF did not though few in 1940 thought the more distant Berlin was vulnerable and the first raids, pin-pricks though they were compared with what was to come, embarrassed the Nazi hierarchy and convinced Adolf Hitler (1889-1945; German head of government 1933-1945 & head of state 1934-1945) to fear that ominous mantra of the 1930s: “The bomber will always get through”.

Accordingly, needing to retain popular support and well aware of the capital’s lack of air-raid shelters (though the leading Nazis and their families were well provided for), the Führer ordered the construction of huge anti-aircraft gun towers, the designs submitted for his approval as early as the following March.  Construction began immediately and the first, the Berlin Zoo Flak Tower, was made operational within months and in its massiveness was entirely typical of the architectural practices of the Third Reich.  Reflecting Hitler’s preferences, it was rendered in a neo-Romantic style and any medieval soldier would have recognized it as a fortress, albeit one on a grand scale.  It gained its name by virtue of its proximity to the municipal zoo and the term “tower” was a rare instance of modesty of expression during the Nazi era.  The reinforced concrete structure was as tall as a 13-story building with a 70 x 70 m (230 x 230 feet) footprint and in addition to the flak guns on the roof, it housed an 85-bed hospital, extensive storage space for art works & cultural artifacts as well as the capacity to provide shelter for some 15,000 people (a number greatly exceeded later in the war when the raids became both frequent and severe.

The installed armament was a battery of four 128 mm (5 inch) twin Flak mounts, augmented by 20 mm (¾ inch) and 37-mm (1½ inch) guns on lower platforms, the sides of the tower 8 m (26 feet) thick, the roof 5 m (16 feet).  The versatility of the design was proven when in 1945 the city was under assault by the Red Army and the big guns were deployed at low angle, proving highly effective as tank destroyers and according to the estimates of both sides, delaying the entry of Soviet troops by almost two weeks.  Even then, after the city had been occupied and the surrender negotiated, the Germans remained in control of the tower, the thick walls having withstood all attacks.  After the war, it proved difficult to demolish and it was only in 1948, after several attempts and over 100 tons of explosives that finally it was razed, the land eventually returned to the Berlin Zoo.

Ghat

Ghat (pronounced gat, got (Indian) or gawt (Indian) or (apparently optionally) fat/fhat for certain slang)

(1) In India, a wide set of steps descending to a river, especially a river used for bathing; a mountain pass; a mountain range or escarpment; a place of cremation (also as burning-ghat).

(2) A leaf possessing simulative qualities, chewed in Yemen, Ethiopia, Somalia, and among Yemenite Jews in Israel.  Ghat chewing sessions are social and involve playing music, smoking a nargilah (a hookah-type device for smoking) and what’s sometimes described as “other such Eastern reveries” (usually with initial capital).

(3) Among the criminal classes, a slang word for a firearm, derived from the Gat Air Pistol, a low-velocity air-powered pistol produced circa 1937-1996 which fired a variety of projectiles.

(4) An acronym standing for Give Hope And Take (away), a short series of events in which someone gives hope to another then instantly and ruthlessly takes it away.

(5) Slang for something very good or much admired (class specific with a noted ethnic bias in use).

(6) As a homophone, slang for the Gatling Gun.

(7) As the homophonic acronym GATT, the General Agreement on Tariffs & Trade (1947-1995), predecessor of the World Trade Organization (WTO) arrangements.

(8) In Hinduism, a certain type of temple.  A brahmin (a member of the highest (priestly) caste) who acted as the hereditary superintendent of a particular ghat (temple) and who was regarded as authoritative in matters of genealogy and ritual was known as a panda.

1595–1605: From Hindi घाट (ghāṭ) (a pier; a pass of descent from a mountain, hence also "mountain range, chain of hills," also "stairway leading up from a river" (to a shrine, temple, etc.), from the Sanskrit घट्ट (ghaṭṭa or ghattah) (a landing-place, steps on the side of a river leading to the waters).  The Sanskrit is of unknown origin but there may be a connection with the Telugu కట్ట (kaṭṭa) (dam, embankment).  In Indian use, the related form is ghaut.  Under the Raj, some language guides suggested a ghaut differed from a ghat in that the former was used exclusively to describe “a ravine leading to the sea” but this was later discredited.  The mistake probably arose in assuming a local practice was universal and it appears ghaut and ghat were inconsistently but widely used interchangeably (the plural was ghauts).  Ghat is a noun; the noun plural is ghats.

As a point of usage, it appears the slang forms of ghat should be pronounced with a hard “G” except when used in meaning 5 (above) when an “ef” or “ph” (as in fat or phat) is used.  It’s an important convention of use: If one has just been ghatted in the sense of meaning 4 (above), it’s correct to say “The bitch really gatted me” and not “The bitch really phatted me”.  That really seems just common sense.        

The Gat Air Pistol

The Gat Air Pistol was made by the Harrington company in the UK.  It was in production continuously between the late 1930s and late 1990s, except during the Second World War when the factory re-tooled for war production.  The pistol could fire .177 pellets, ball bearings, darts, corks and anything else small and light enough to suit the barrel.  A low-powered weapon with a very low muzzle velocity, the target market was hobbyists and children.  There was a time when children were given such things.  The other lucrative market was the travelling fair.  In every sideshow ally there were usually several shooting gallery stall owners who offered famously worthless prizes for anyone able to hit the target and for their purposes, the cheaply-produced, notoriously inaccurate Gat was ideal.  Anyone who could hit a target with a Gat gun was probably a pretty bad shot.

Spat

Spat (pronounced spat)

(1) A petty quarrel; a dispute.

(2) A light blow; a slap or smack (now rare).

(3) A classic footwear accessory for outdoor wear (technically an ankle-length gaiter), covering the instep and ankle, designed to protect these areas from mud & stones etc which might be splattered (almost always in the plural).

(4) In automotive design, a piece of bodywork on a car's fender encapsulating the aperture of the wheel-arch, covering the upper portion of the wheel & tyre (almost always on the rear) and used variously to reduce drag or as a aesthetic choice.  In the US, these tend to be called "fender skirts".

(5) In aviation, on aircraft with fixed undercarriages, a partial enclosure covering the upper portion of the wheel & tyre, designed to reduce drag.

(6) In zoology, a larval oyster or similar bivalve mollusc, applied particularly when one settles to the sea bottom and starts to develop a shell; young oysters collectively, especially seed oysters.

1350-1400: From the Middle English spat (argument, minor scuffle), from the Anglo-Norman spat, of unknown origin but presumed related either to (1) being the simple past tense & past participle of spit or (2) something vaguely imitative of the sound of a dispute in progress.  In use, a spat implies a dispute which is minor and brief.  That doesn’t preclude violence being involved but the word does tend to be applied to matters with few serious consequences but a spat can of course escalate to something severe at which point it ceases to be a spat and becomes a brawl, a fight, a murder, a massacre or whatever the circumstances suggest is appropriate.  Otherwise, a spat is synonymous with words like bickering, brouhaha, disagreement, discord, falling-out, feud, squabble, tiff or argument.

As a descriptor of the short gaiter covering the ankle (which except in technical and commercial use is used only in the plural), use dates from 1779 as an invention of American English and a shortening of the trade-terms spatterdash (or splatterguard) (long gaiter to keep trousers or stockings from being spattered with mud), the construct being spatter + dash (or guard), the former the same idea as the noun dashboard which was a timber construction attached to the front of horse-drawn carriages to protect the passengers from mud or stones thrown up when the beasts were at a dash.  In cars, the use of the term dashboard persisted although the device both shifted rearward (aligned with the cowl (scuttle) & windscreen) and changed in function.  In aircraft where the link to horse-drawn transport didn’t exist, the preferred equivalent term became “instrument panel”.

Stanley Melbourne Bruce (front row, second from left) in spats, official photograph of his first cabinet, Melbourne, 1923.

Spats date from a time when walking in cities could be a messy business, paved surfaces far from universal.  As asphalt and concrete became commonplace in the twentieth century, spats fell from frequent use though there were those who clung to them as a fashion accessory.  Stanley Melbourne Bruce (1883–1967; prime minister of Australia 1923-1929) liked spats and wore them as late as the 1940s but historians of fashion note it's said nothing was more influential in their demise than George V (1865–1936; King of the United Kingdom 1910-1936) eschewing them after 1926.

However, despite losing the imprimatur of the House of Windsor (ex Saxe-Coburg and Gotha), when Disney in 1947 created Scrooge McDuck (the world's richest duck, noted for diving into his vast "money bin" to swim among the cash), spats must still have been associated with wealth and uncle Scrooge has almost always been depicted sporting a pair.

Spats (left) and gaiters (centre & right).  Historically, gaiters were either medium (mid-calf) or long (reaching to the knee) while the shorter variations, extending from ankle to instep, were known as spats.  In the fashion industry, the terms gaiters and spats are often used interchangeably and except among the equestrian and other horse-oriented crowds, they now exist only as a fashion item, improvements in the built-environment meaning the need for them as functional devices has diminished.  They days, spats tend to be seen only in places like the Royal Enclosure at Ascot or smart weddings (used as a wealth or class signifier) although variations are still part of some ceremonial full-dress military uniforms.  Technically, a spat probably can be called a “short” or “ankle-length” gaiter but it’s wise to use “spat” because gaiters are understood as extending higher towards the knee.

Lindsay Lohan in SCRAM bracelet (left), the SCRAM (centre) and Chanel's response from their Spring 2007 collection (right).

Spats for the twenty-first century: Before Lindsay Lohan began her “descent into respectability” (a quote from the equally admirable Mandy Rice-Davies (1944-2004) of MRDA fame), Lindsay Lohan inadvertently became of the internet’s early influencers when she for a time wore a court-ordered ankle monitor (often called “bracelets” which etymologically is dubious but rarely has English been noted for its purity).  At the time, many subject to such orders often concealed them under clothing but Ms Lohan made her SCRAM (Secure Continuous Remote Alcohol Monitor) a fashion statement, something that compelled the paparazzi to adjust their focal length to ensure her ankle of interest appeared in shots.  The industry responded with its usual alacrity and “ankle monitor” purses were soon being strutted down the catwalks.

Chanel's boot-mounted ankle purse in matching quilted black leather.

In one of several examples of this instance of Lohanic influence on design, in their Spring 2007 collection, Chanel included a range of ankle bags.  Functional to the extent of affording the wearing a hands-free experience and storage for perhaps a lipstick, gloss and credit card (and the modern young spinster should seldom need more), the range was said quickly to "sell-out" although the concept hasn't been seen in subsequent collections so analysts of such things should make of that what they will.  Chanel offered the same idea in a boot, a design actually borrowed from the military although they tended to be more commodious and, being often used by aircrew, easily accessible while in a seated position, the sealable flap on the outer calf, close to the knee.

On the Jaguar 2.4 & 3.4 (1955-1959, top row; later retrospectively named Mark 1), full-sized spats were standard equipment when the standard wheels were fitted but some owners used the cut-down versions (available in at least two designs) fitted when the optional wire wheels were chosen.  For use in competition, almost all drivers removed the spats.  The Mark 2 (bottom row;1959-1969) was never fitted with the full-size units but many used slimmer version available from both the factory and third-party suppliers; again, in competition, spats in any shape were usually discarded.  On the big Jaguars, spats (which had already been scalloped) disappeared after production of the Mark IX ended in 1961.    

On cars, it wasn’t until the 1930s that spats (which some English manufacturers called "aprons" and in the US they came to be called “fender-skirts” though the original slang was “pants”) began to appear as the interest in streamlining and aerodynamic efficiency grew and it was in this era they became also a styling fad which, for better and worse, would last half a century.  They’d first been seen in the 1920s as aerodynamic enhancements on speed record vehicles and some avant-garde designers experimented with enveloping bodywork but it was only late in the decade that the original style of separate mudguards (later called cycle-fenders) gave way to more integrated coachwork where the wheel-arch was an identifiable feature in the modern sense.  Another issue was that the early tyres were prone to wear and damage and needed frequently to be changed, hence the advantage of making access to the wheels un-restricted.  In the 1930s, as streamlining evolved as both a means to reduce drag (thus increasing performance and reducing fuel consumption) and as a styling device, the latter doubtlessly influenced by the former.  On road cars, spats tended to be used only at the rear because of the need to provide sufficient clearance for the front wheels to turn although there were manufacturers (Delahaye, Nash and others) which extended use to the front and while this necessitated compromise (notably the turning circle and cooling of the brakes), there were some memorable art-deco creations.

The aerodynamic advantages were certainly real, attested by the tests conducted during the 1930s by Mercedes-Benz and Auto-Union, both factories using spats front and rear on their land-speed record vehicles, extending the use to road cars although later Mercedes-Benz would admit the 10% improvement claimed for the 1937 540K Autobahn-kurier (highway cruiser) was just “a calculation” and it’s suspected even this was more guesswork than math.  Later, Jaguar’s evaluation of the ideal configuration to use when testing the 1949 XK120 on Belgium roads revealed the rear spats added about 3-4 mph to top speed though they precluded the use of the lighter wire wheels and did increase the tendency of the brakes to overheat in severe use so, like many things in engineering, it was a trade-off.

1958, 1959 & 1960 Chevrolet Impalas.  Not actually wildly popular when new, accessory spats now often appear on restored cars as a “period accessory”.

In the post-war years, concerns with style rather than specific aerodynamic outcomes probably prevailed.  In the US especially, the design motifs borrowed from aircraft and missiles (where aerodynamic efficiency was important and verified in wind tunnels) were liberally applied to automobiles but in some cases, although they actually increased drag, they anyway appeared on production cars because they lent the desired look.  Because they added to the cost of production, spats tended often to be used on the more expensive ranges, this association encouraging after-market accessory makers to produce them, often for models where they’d never been available as a factory fitting or option.  Although now usually regarded as naff (at least), there’s still some demand because they are fitted sometimes (often in conjunction with that other acquired taste period-accessory, the "Continental" spare-tyre kit) by those restoring cars from the era although the photographic record does suggest that when the vehicles were new, such things were vanishingly rare.

Spats vanished from cars made in the UK and Europe except among manufacturers (such as Citroën) which made a fetish of conspicuous aerodynamics and in the US, where they endured, increasingly they appeared in cut-down form, exposing most of the wheel with only the upper part of the tyre concealed.  By the mid 1990s spats appeared only on some of the larger US cars (those by then also down-sized from their mid-seventies peak) and none survived into the new century, the swansong the 1996 Cadillac DeVille.  However, the new age of efficiency did see a resurgence of interest with spats (some actually integrated into the bodywork rather than being detachable) used on some electric and hybrid vehicles where every possible way of optimizing the use of energy is deployed.

1 1937 Mercedes-Benz 540K Autobahn-kurier
2 1937 Mercedes-Benz W125 Rekordwagen
3 1937 Auto-Union Type C Stromlinie
4 1939 Mercedes-Benz W154 Rekordwagen
5 1939 Mercedes-Benz T80 Rekordwagen
6 1940 Mercedes-Benz 770K Cabriolet B
9 1970 Porsche 917 LH
8 1988 Jaguar XJR9

1939 Mercedes-Benz T80, Mercedes-Benz Museum, Stuttgart, Germany.

Designed by Ferdinand Porsche (1875–1951), the Mercedes-Benz T80 was built between 1937-1939 to lay siege to the world land speed record (LSR) but with the outbreak of World War II (1939-1945), the attempt was never made.  It was a single-purpose machine designed to achieve maximum terminal velocity and for that reason, the T80 was an exercise in pure functionalism; not one nut or bolt was used other than for the purpose of ensuring its top speed would be as high as possible.  Cognizant of the existing record, the initial goal was 550 km/h (342 mph) but as others in the late 1930s raised the mark, so were Professor Porsche’s ambitions and when the final specification was set in 1939, the target was 650 km/h (404 mph) (not 750 km/h (466 mph) as is sometimes quoted).  Configured with six wheels, the T80 would have used a supercharged, fuel-injected, 44.5 litre (2716 cubic inch) Daimler-Benz DB 603 inverted V12 aero-engine, an enlarged version of the DB 601 which powered a number of Messerschmitts and other warplanes.  Intended for use in bombers, the T80’s engine was actually the third DB 603 prototype and was initially tuned to generate some 2237 kW (3000 horsepower) on an exotic cocktail of methyl alcohol (63%), benzene (16%), ethanol (12%), acetone (4.4%), nitrobenzene (2.2%), avgas (2%), and ether (0.4%) with MW (methanol-water) injection for charge cooling and as an anti-detonant.  This was more than twice the output of the Hurricanes, Spitfires and Messerschmitts which in 1940 fought the Battle of Britain but Porsche’s calculations suggested 2,574 kW (3,500 hp) would be needed to touch the 650 km/h target and the DB 603 would have been re-tuned to achieve this as an “emergency war rating”.

1939 Mercedes-Benz T80, Mercedes-Benz Museum, Stuttgart, Germany.

Some 8 metres (26 feet) in length with two of the three axles providing drive, the weight when fuelled and crewed was some 2600 kg (2.9 short tons) while the measured coefficient of drag (CD) was reported at 0.18, an impressive figure for such a thing as late as the 1990s and it would have been lower still, had wind-tunnel testing not revealed the need to add two small “winglets” to provide sufficient down-force to ensure the shape didn’t at speed assume the characteristics of an aeroplane and "try to take off" and notably, when in 1964 the Bluebird-Proteus CN7 set the flying mile record at 403.1 mph (648.7 km/h), it was the first LSR machine to include “ground effect” technology to reduce lift.  Fundamentally, the aerodynamics are thought sound although there would be the usual vulnerability to cross-winds, the cause of several deaths in such attempts and the surface conditions of what was a temporarily closed public road would also have been critical; whether the tyre technology of the time would have been adequate under such conditions will never be known.  Had the T80 been run on the long, flat straights of the salt flats in the US (Bonneville) or Australia (Lake Eyre), the prospects of success would have been better but for propaganda purposes (always a theme for the Nazis) the LSR runs had to be on German soil.

Bluebird-Proteus CN7, Lake Eyre, Australia, 1964.

The plan was for the attempt to be staged in January 1940 during what the regime dubbed RekordWoche (Record Week) on a section of the Berlin-Halle-Leipzig autobahn (now part of the A9), closed for the occasion.  The legend is that Adolf Hitler (1889-1945; Führer (leader) and German head of government 1933-1945 & head of state 1934-1945) himself choose the nickname Schwarzer Vogel (Black Bird) but that too may have been propaganda.  The design was all done in the era of slide rules and although some computer work has been applied to emulating the event, there’s no consensus on whether the T80 really would have hit 650 km/h and set the world land speed record (LSR).  As it was, it wasn't until November 1965 that the 650 km/h mark was reached by a machine powered by four fuel injected Chrysler 426 cubic inch (7.0 litre) hemi V8s.  On the Bonneville Salt Flats, it recorded a two-way average of 658.526 km/h (409.277 mph).

Ground effects: 1970 Chaparral 2J (the "sucker car"). 

The most extraordinary vindication of the concept was probably the 1970 Chaparral 2J, built for the Canadian-American Challenge Cup (the Can-Am, a series for unlimited displacement sports cars under the FIA’s minimalist Group 7 rules).  Although using a similar frame and power-plant (the all aluminum, 427 cubic inch (7.0 litre) Chevrolet V8 (ZL1)) as most of its competition, it differed in that the bodywork was rather more rectilinear, the transmission was semi-automatic and, most intriguingly, the use of two small auxiliary engines (Rockwell JLO 247 cm³ two-stroke, two-cylinder units which usually powered snowmobiles).  Unlike the auxiliary engines used in modern hybrids which provide additional or alternative power, what the Rockwells did was drive two fans (borrowed from the M-109 Howitzer, the US Army’s self-propelled 155 mm (6 inch) cannon) which pumped air from underneath at 9650 cfm (cubic feet per minute) (273 m3 per minute), literally sucking the 2J to the road, the technique enhanced by a Lexan (a thermoplastic polymer) skirt which partially sealed the gap between the shell and the road.  The rear spats (integrated into the body-shell) were part of the system, offering not only their usual contribution to reduced drag but increasing the extent of the suction generated by the extractor fans.  The 2J was immediately faster than the competition but the suction system proved fragile although, as a proof of concept it worked and it was clear that only development was needed to debug things.  Unfortunately, innovation and high speed have always appalled the FIA (the Fédération Internationale de l'Automobile which has for decades been international sport’s dopiest regulatory body) and, using the mechanism of the Commission Sportive Internationale (CSI) which was at the time the FIA’s competition arm, it prevailed upon the SCCA (Sports Car Club of America) to ban the J2 on the grounds the fans constituted “movable aerodynamic aids” which the FIA had earlier banned (rather than regulating which would have been the intelligent thing to do).  Deciding the fans should be handled with the same rule used for chassis or suspension-mounted wings which had proved fragile demanded some torturous reasoning which made sense to few outside the FIA’s many committee rooms but the sport had ever since been stuck with its implications.  Really, the FIA should give up on motorsport and offer their services to competitive crochet where they can focus on things like pins and needles not being too sharp.

1949 Delahaye 175-S Saoutchik roadster (left), 1967 Cadillac Fleetwood Sixty Special  (centre) & 2016 Rolls-Royce Vision Next 100 (electric) (right).

Fashions change and spats in the post-war years became unfashionable except in the odd market segment which appealed to an older demographic and even there, as the years were by, they were cut-away, revealing more of the wheel & tyre but they never entirely went away and designers with big computers now don’t even need even bigger wind tunnels to optimize airflow and spats have been displayed which are mounted vertically, some even responding to dynamic need by shifting location or direction.

Flown first in 1938 and named after the Spartan admiral Lysander (circa 467-395 BC), the Westland Lysander was a British army co-operation and communications aircraft used extensively during the Second World War (1939-1945).  Although it couldn’t match the extraordinary STOL (short Take-Off & Landing) performance of the its German contemporary the Fieseler Fi 156 Storch, it was capable, robust and had a good enough short-field capability to perform valuable service throughout the conflict.  Like many aircraft with a fixed undercarriage, partially enveloping spats were fitted to reduce drag but those on the Lysander had the unusual feature of being fitted with their own removable spats (similar to those used on automobiles).  Once these were dismounted, assemblies could be fitted to mount either Browning machine guns or stub wings which could carry light bombs or supply canisters.  The arrangement was popular with ground crew because the accessibility made servicing easy and pilots appreciated the low placement because the change in weight distribution had little adverse effect on handling characteristics.