Float

Float (pronounced floht)

(1) To rest, move or remain on the surface of a liquid (to be buoyant; to be supported by a liquid of greater density, such that part (of the object or substance) remains above the surface) or in the air.

(2) By metaphor, to move lightly and gracefully.

(3) By metaphor, information or items circulating.

(4) Figuratively, to vacillate (often followed by between).

(5) As applied to currencies, to be allowed freely to fluctuate in the foreign-exchange market instead of being exchanged at a fixed or managed rate.

(6) In the administration of interest rates, periodically to change according to money-market conditions.

(7) In the equities markets, the offering of previously privately held stock on public boards; an offering of shares in a company (or units in a trust) to members of the public, normally followed by a listing on a stock exchange.

(8) In the bond markets, an offering.

(9) In theatre, to lay down (a flat), usually by bracing the bottom edge of the frame with the foot and allowing the rest to fall slowly to the floor.

(10) An inflated bag to sustain a person in water; life preserver.

(11) In plumbing, in certain types of tanks, cisterns etc, a device, as a hollow ball, that through its buoyancy automatically regulates the level, supply, or outlet of a liquid.

(12) In nautical jargon, a floating platform attached to a wharf, bank, or the like, and used as a landing; any kind of buoyancy device.

(13) In aeronautics, a hollow, boat-like structure under the wing or fuselage of a seaplane or flying boat, keeping it afloat in water (aircraft so equipped sometimes called “float planes”).

(14) In angling, a piece of cork or other material for supporting a baited line in the water and indicating by its movements when a fish bites.

(15) In zoology, an inflated organ that supports an animal in the water; the gas-filled sac, bag or body of a siphonophore; a pneumatophore.

(16) A vehicle bearing a display, usually an elaborate tableau, in a parade or procession.

(17) In banking, uncollected checks and commercial paper in process of transfer from bank to bank; funds committed to be paid but not yet charged against the account.

(18) In metal-working, a single-cut file (a kind of rasp) of moderate smoothness.

(19) In interior decorating, a flat tool for spreading and smoothing plaster or stucco.

(20) In stonemasonry, a tool for polishing marble.

(21) In weaving and knitting, a length of yarn that extends over several rows or stitches without being interworked.

(22) In commerce, a sum of physical cash used to provide change for the till at the start of a day's business.

(23) In geology and mining, loose fragments of rock, ore, etc that have been moved from one place to another by the action of wind, water etc.

(24) To cause something to be suspended in a liquid of greater density.

(25) To move in a particular direction with the liquid in which one is floating (as in “floating downstream” etc).

(26) In aviation, to remain airborne, without touching down, for an excessive length of time during landing, due to excessive airspeed during the landing flare.

(27) To promote an idea for discussion or consideration.

(28) As expression indicating the viability of an idea (as in “it’ll never float”, conveying the same sense as “it’ll never fly”).

(29) In computer (graphics, word processing etc), to cause an element within a document to “float” above or beside others; on web pages, a visual style in which styled elements float above or beside others.

(30) In UK use, a small (often electric) vehicle used for local deliveries, especially in the term “milk float” (and historically, the now obsolete “coal float”).

(31) In trade, to allow a price to be determined by the markets as opposed to by rule.

(32) In insurance, premiums taken in but not yet paid out.

(33) In computer programming, as floating-point number, a way of representing real numbers (ie numbers with fractions or decimal points) in a binary format

(34) A soft beverage with a scoop of ice-cream floating in it.

(35) In poker, a manoeuvre in which a player calls on the flop or turn with a weak hand, with the intention of bluffing after a subsequent community card.

(36) In knitting, one of the loose ends of yarn on an unfinished work.

(37) In transport, a car carrier or car transporter truck or truck-and-trailer combination; a lowboy trailer.

(38) In bartending, the technique of layering of liquid or ingredients on the top of a drink.

(39) In electrical engineering, as “float voltage”, an external electric potential required to keep a battery fully charged

(40) In zoology, the collective noun for crocodiles (the alternative being “bask”).

(41) In automotive engineering, as “floating axle”, a type of rear axle used mostly in heavy-duty vehicles where the axle shafts are not directly attached to the differential housing or the vehicle chassis but instead supported by bearings housed in the wheel hubs.

Pre 1000: From the Middle English floten, from the Old English flotian (to float), from the Proto-Germanic flutōną (to float), from the primitive Indo-European plewd- & plew- (to float, swim, fly).  It was cognate with the Saterland Frisian flotje (to float), the West Frisian flotsje (to float), the Dutch vlotten (to float), the German flötzen & flößen (to float), the Swedish flotta (to float), the Lithuanian plaukti, the Middle Low German vloten & vlotten (to float, swim), the Middle Dutch vloten, the Old Norse flota, the Icelandic fljóta, the Old English flēotan (to float, swim), the Ancient Greek πλέω (pléō), the Lithuanian plaukti, the Russian пла́вать (plávatʹ) and the Latin plaustrum (wagon, cart).  It was akin to the Old English flēotan & Old Saxon flotōn (root of fleet).  The meaning “to drift about, passively to hover" emerged circa 1300 while the transitive sense of “to lift up, to cause to float (of water etc)” didn’t come into use for another 300-odd years and the notion of “set (something) afloat” was actually originally figurative (originally of financial matters) and noted since 1778.  Float was long apparently restricted to stuff in the water and didn’t come into use to refer to things in the air until the 1630s, this extending to “hover dimly before the eyes” by at least 1775.   In medicine, the term “floating rib” was first used in 1802, so called because the anterior ends are not connected to the rest.  The Proto-Germanic form was flutojanan, from the primitive Indo-European pleu (to flow) which endures in modern use as pluvial.

Etymologists have concluded the noun was effectively a merger in the Middle English of three related Old English nouns: flota (boat, fleet), flote (troop, flock) & flot (body of water, sea), all from the same source as the verb.  The early senses were the now-mostly-obsolete ones of the Old English words: the early twelfth century “state of floating"”, the mid thirteenth century “swimming”, the slightly later “a fleet of ships; a company or troop” & the early fourteenth century “stream or river”.  From circa 1300 it has entered the language of fishermen to describe the attachments used to add buoyancy to fishing lines or nets and some decades later it meant also “raft”.  The meaning “a platform on wheels used for displays in parades etc” dates from 1888 and developed either from the manner they percolated down a street on from the vague resemblance to flat-bottomed boat which had been so described since the 1550s.  The type of fountain drink, topped with a scoop of ice cream was first sold in 1915.

The noun floater (one who or that which floats) dates from 1717 as was the agent noun from the verb.  From 1847 it was used in political slang to describe an independent voter (and in those days with the implication their vote might be “for sale”), something similar to the modern “swinging voter”.  By 1859 it referred to “one who frequently changes place of residence or employment” and after 1890 was part of US law enforcement slang meaning “dead body found in the water”.  The noun flotation dates from 1765, the spelling influenced by the French flotaison.  The adverb afloat was a direct descendent from the Old English aflote.  In idiomatic use, it was the boxer Muhammad Ali (1942–2016) who made famous the phrase “float like a butterfly; sting like a bee” and “whatever floats your boat” conveys the idea that individuals should be free to pursue that which they enjoy without being judged by others.  To “float someone’s boat” is to appeal to them in some way.  Float is a noun & verb, floater is a noun, floated is a verb, floating is a noun, verb & adjective and floaty is a noun & adjective; the noun plural is floats.

Lindsay Lohan floating in the Aegean, June 2022.

In the modern age, currencies began to be floated in the early 1970s after the collapse of the Bretton Woods system (1944) under which most major currencies were fixed in relation to the US dollar (which was fixed to gold at a rate of US$35 per ounce).  That didn’t mean the exchange rates were static but the values were set by governments (in processes called devaluation & revaluation) rather than the spot market and those movements could be dramatic: In September 1949, the UK (Labour) government devalued Sterling 30.5% against the US dollar (US$4.03 to 2.80).  The Bretton Woods system worked well (certainly for developed nations like the US, the UK, Japan, Canada, Australia, New Zealand and much of western Europe) in the particular (and historically unusual) circumstances of the post-war years but by the late 1960s, with the US government's having effectively printed a vast supply of dollars to finance expensive programs like the Vietnam War, the nuclear arms build-up, the “Great Society” and the space programme, and social programs, surplus dollars rapidly built up in foreign central banks and increasingly these were being shipped back to the US to be exchanged for physical gold bars.  In 1971, the Nixon administration (1969-1974) responded to the problem of their dwindling gold reserves by suspending the convertibility, effectively ending the Bretton Woods system and making floating exchange probably inevitable, the trend beginning when Japan floated the Yen in 1973.

A Bloomberg chart tracking the effect of shifting the US dollar from its link with gold to a fiat currency.  Due to this and other factors (notably the oil price), in the 1970s, the bills of the 1960s were paid.

Others however moved more slowly, many adopting the tactic of the Australian government which as late as 1983 was still running what was known as a “managed float”, an arrangement whereby the prime-minister, the treasurer and the head of the treasury periodically would meet and, using a “a basket of currencies”, set the value of the Australian dollar against the greenback and the other currencies (the so-called “cross-rates”).  Now, most major Western nations have floating currencies although there is sometimes some “management” of the “float” by the mechanism of central banks intervening by buying or selling.  The capacity for this approach to be significant is however not as influential as once it was because the numbers in the forex (foreign exchange) markets are huge, dwarfing the trade in commodities bonds or equities; given the volumes, movements of even fractions of a cent can mean overnight profits or losses in the millions.  Because some "floats" are not exactly "free floats" in which the market operates independently, there remains some suspicion that mechanisms such as "currency pegs" (there are a remarkable variety of pegs) and other methods of fine tuning can mean there are those in dark little corners of the forex world who can benefit from these manipulations.  Nobody seem prepared to suggest there's "insider trading" in the conventional sense of the term but there are some traders who appear to be better informed that others. 

Orifice

Orifice (pronounced awr-uh-fis or or-uh-fis)

A mouth, opening or aperture, as of a tube or pipe; a mouth-like opening or hole; mouth; vent (mostly technical or medical use).

1535–1545: From the Middle English orifice (an opening, a mouth or aperture), from the Old French & Middle French orifice (the opening of a wound), from the Late Latin ōrificium (an opening (literally "the making of a mouth")), the construct being Latin ōr- (stem of ōs (genitive oris)) (mouth (and related to "oral")) + fic- (combining form of facere; facio) (to make, to do) + -ium (the noun suffix).  The root of facere was the primitive Indo-European dhe- (to set, put).  The adjective unorificed appears mostly in engineering where mostly its used to describe a component without an orifice (there is often an otherwise identical part with at least one orifice).  Orifice is a noun, orifical, orificial & orificed are adjectives; the noun plural is orifices.  Neither orificeish or orificesque appear to exist.

Miss Schilling’s Orifice

Rolls-Royce Merlin V12.

Fuel to early versions of the twenty-seven litre (1648 cubic inch) Rolls-Royce Merlin V12 engine was supplied with a carburetor, putting the pilots in the Merlin-powered Spitfires and Hurricanes at a disadvantage against the German Messerschmitt BF109 fighters which used a fuel-injected Daimler-Benz DB601 inverted V12.  In the British planes, during a negative G-force maneuver (pitching the nose hard down), fuel was forced upwards to the top of the carburetor's float chamber rather than into the combustion chamber, leading to a loss of power. If the negative G continued, the fuel would collect in the top of the float chamber, forcing the float to the bottom. This in turn would open the needle valve to maximum, flooding the carburetor with fuel, drowning the supercharger with an over-rich mixture which would shut down the engine, a serious matter in aerial combat.

Battle of Britain era Hawker Hurricane Mk IIA and Supermarine Spitfire Mk II.

Ms Beatrice “Tilly” Shilling (1909-1990) was a pre-modern rarity, a female engineer and amateur racing driver.  While employed as an engineer at the Royal Aircraft Establishment (RAE) at Farnborough, she worked on the fuel delivery problem, concluding quickly the only complete solution for fuel starvation was a pressurized fuel system such as the direct injection on the Daimler-Benz V12s but that such a development would take months to design, test, manufacture and install.  However, as a stop-gap measure, she designed a flow restrictor: a small metal disc with a central orifice, looking much like a plain metal washer.  The restrictor orifice was sized to accommodate just the fuel flow needed for maximum engine power, the setting usually used during dogfights and it solved the immediate, critical, problem of the engine shutdowns following flooding.  Officially named the RAE Restrictor or RAE Anti “G” Carburetor, the device proved popular with pilots, who much preferred to call it Miss Shilling's orifice or the Tilly orifice.  The simple and elegant solution proved effective until pressurized carburetors (essentially throttle-body injection, a simplified version of the Daimler-Benz direct fuel injection) were developed which permitted even inverted flight.  With a backpack of RAE Restrictors, she toured RAF airfields on her motor-bike instructing and assisting the maintenance crews with the installation of the devices.

RAE Anti "G" carburetor restrictor plate instruction sheet.

Ms Shilling was a serious engineer making an important contribution to the war effort and was not amused by the nick-names for her invention but, reportedly regarded it as something typical of minds of men, rolled her eyes and carried on with her work.  The orifice was but a footnote in the history of the Merlin and the Allied war effort but did typify the improvisation and speed with which British industry developed "quick & dirty" solutions, especially in the early days of the war.

Tilly Shilling on her Norton N30 500, Brooklands, July 1935.  Note the fishtail Brooklands Can (technically the Brooklands Silencer), designed in response to complaints from residents around the circuit who objected to the noise.

Even before she gained her MSc (Master of Science) in mechanical engineering, Ms Shilling had been building and racing motorcycles and it was on her modified (at one point she even fitted a supercharger) 490 cm³ Norton M30, she lapped the Brooklands track at 106 mph (171 km/h), a feat for which she was awarded the BMRC (British Motorcycle Racing Club) Brookland Gold Star; she remains only one of three women to have lapped the famous banked circuit “at the ton” before it was closed in 1939.  With the coming of war, she returned the Norton to road use and it was the machine she rode (rapidly) between RAF aerodromes to deliver the restrictor plates and instruct the ground crews about the installation routine.  As a road bike, she used the Norton until 1953.

Desmodromic

Desmodromic (pronounced des-moh-drom-ick)

(1) In internal combustion engines, a valve drive-train in which poppet valves are positively closed by a cam and leverage system, rather than a conventional spring.

(2) By extension, in various mechanical devices, a component having different controls for its actuation in different directions.

1953:  A construct from the Ancient Greek δεσμός (desmós) (band, connection; fibrous connection, ligament; bond or knot) + δρόμος (drómos) (a course; travel; road).  The etymology is likely oblique to all but mechanical engineers but denotes the characteristic of valves continuously being "bound" to the camshaft.  The idea of desmo + dromic is thus often deconstructed as something like “running in unison” or “connected racing” but that’s because of the historic association with engines and speed and the desmo- prefix is also used in medicine and other biological sciences in the sense of “being or maintaining a connection”, a desmosome a filament-like substance with which cells adhere to each-other and desmoplakin" is the protein associated with this intercellular junction.  In zoology, the term most closely analogous to desmodromic valve trains is desmopelmous, a type of foot in birds in which the hind toe cannot be bent independently because planter tendons are united (ie they are connected and work in unison).

Conventional valve activation (left) versus desmodromic (right).

Probably as soon as there were poppet valves engineers began to ponder way of perfecting their opening and closing, the use of a spring for the latter effective but inexact and embryonic ideas would have been discussed but it was the German Daimler company which was first granted a patent for a desmodromic like valve-train system for a V-twin engine in 1889.  After that, designs, prototypes and even the odd racing car appeared so equipped and while there was some success on the track, no manufacturer attempted mass-production because of the high costs inherent in the intricate design and, more practically, the formidably frequency with which the system demanded adjustment to maintain perfect operation.  However, as the trophies won in competition had celebrated, the desmodromic arrangement uniquely permitted very high engine speeds and thus more power without the need to increase displacement and therefore bulk and weight.

A desmodromic valve schematic.

During World War II, there were great advances in metallurgy and the design of internal combustion engines and one manufacturer which had learned much was Daimler-Benz which had perfected the pressurized fuel-injection system which early in the conflict had given Luftwaffe pilots some real advantages over the allied opposition which continued to rely on primitive carburettors for fuel delivery, these adversely affected by gravity while the German aircraft were not.  However, the valve-train relied still on a spring to effect closing and this was a limitation which prevented the advantages of fuel-injection being fully explored.  The big aero-engines in the wartime Messerschmitts has been low-revving so the valve-springs weren’t challenged by physics but the company’s interest has returned to the race tracks and there, the systems limitations were exposed, “valve-float” intruding at high engine speeds.  The dreaded valve float is a phenomenon which occurs at high engine speeds when valve springs can’t return the valves to their seat with the cam follower still in contact with the cam.  This means the valves can be launched too high, even to the point where it can be still wide open when the piston arrives at the top dead centre (TDC), something which in the worst case can result in impact between the two, bending or even snapping the valve.  That will often be catastrophic, the debris perforating and possibly collapsing the hot aluminium piston head.  From that point on, the damage caused will be a matter only of extent, ranging from severe to complete destruction.

The Mercedes-Benz W196 Formula One Grand Prix (1954-1955) car used the desmodromic straight-eight in 2.5 litre form.  A 3.0 litre version was created for the W196S (300 SLR) used in sports car racing.  

That was something desirable to avoid in any engine but especially so in a racing car because, as the saying goes, “to finish first, first one must finish”.  Thus was designed Daimler-Benz’s surprisingly simple desmodromic system for the Mercedes-Benz W196 Formula One car for the 1954 season, ruin under the new 2.5 litre (152 cubic inch) displacement rule.  An amusing mix of new (fuel-injection and the desmodromics) and old (archaic swing axles and a straight-eight configuration), it succeeded, dominating the World Championship in 1954-1955 and in 3.0 litre form as the 300 SLR (technically the W196S), sports car racing too.  One thing which proved vital in all this was that the engineers had removed from the desmodromic hardware the small, final closing spring which had previously been thought necessary.  What the Daimler-Benz engineers discovered was that if a residual clearance of a mere 0.03 mm (0.001181099 inch) was machined, by simply leaving the return “desmo valve” in the closed position, the inertia of the valve and the gas pressure in the cylinder was sufficient to maintain the closure, a variation of the exploitation of the long-documented behaviour of fluid dynamics Chrysler would soon market (somewhat opportunistically) as Sonoramic.  The innovation was made possible by the development of metals stimulated by the demands of war; in the pre-war years, the desmodromic design adopted for the W196 simply wouldn’t have been possible.

Schematic of the Mercedes-Benz W196 straight-eight.

The desmodromic valve control system used an opening cam which directly controlled a shoe at the upper end of the cylindrical tappet rod while another (closing) cam used a deliberately out-of-alignment rocker arm which engaged in a hole drilled in the same tappet.  It was simple, precise and effective and reliably delivered such power that even Enzo Ferrari (1898-1988) considered matters desmodromic, discussing the matter with Dr Fabio Taglioni (1920-2001) who was working on the idea, his design first used by Ducati in 1954 on their 125 cm³ (7.6 cubic inch) racer and later adopted for many of their production and competition machines, used even to this day. 

Lindsay Lohan with Ducati Monster 600 (Desmodromic) in Freaky Friday (2003).

Not needing return springs, the valves being positively opened and closed by a cam and leverage system, desmodromic offered higher engine speed, more power and a variety of improvements to specific efficiencies.  Despite that, except for Ducati, it never became a system used by volume manufacturers (or indeed low-volume operations) because of the disadvantages which included complexity, cost, noise (especially as the cylinder count grew) and, critically, more frequent maintenance.  It was advances in high-speed photography and later computer analysis which rendered desmodromic an engineering cul-de-sac.  With a frame-by-frame view of how valves and valve springs behaved, designers were able to engineer solutions to the problems previously though inherent to conventional valve-trains and, by the 1980s, vastly more powerful computers permitted the virtual testing of every design permutation.  Eventually, the advantages offered by desmodromics became so small that few attempted to justify to additional cost and maintenance penalty.

2002 Ducati MH900e (desmodromic).

What the photography revealed was that valve float was caused mostly by resonance in the springs which generated oscillating compression waves among the coils and that at specific resonant speeds, the springs were no longer making contact at one or both ends, leaving the valve “floating” before crashing into the cam on closure.  The solutions were varied and some, such as Norton's “mousetrap” or “hairpin” spring were soon discarded because, although they worked well, the engineering challenges in integrating them with existing combustion chamber designs created as many problems as were solved.  A less elegant but more manageable approach was to install as many as three concentric valve springs, sometimes nested inside one other; not for more force (the inner ones having no significant spring constant), but to act as dampers, both absorbing and reduce oscillations in the outer spring (engineers delighting in calling the additional springs “snubbers”).  Again, the advances in metallurgy made possible what was once though unattainable.  Complex valve springs were engineered which did not resonate, being progressively wound with a varying pitch varying diameter and dubbed “beehive springs” because of the shape.  The number of active coils in these springs would vary during the stroke, the more closely wound coils located at the static end, becoming inactive as the spring compressed or (as in the beehive) where the small diameter coils at the top were stiffer.  Thus valve float was conquered with springs.

2023 Ducati Multistrada V4, the first Ducati in decades to use conventional valve activation.

But Ducati persists to this day, their raucous machines, once a cult known to a few now enjoying a wider audience which seems prepared to accept both the frequency of with which valve-train adjustments are required and the inherent clatter (which is admittedly quite spine-tingling if sampled at speed when wearing a crash helmet).  Tellingly, Ducati’s motor-cycles are almost all V-twins because the noise level does become intrusive as the cylinder count increases and their recent Multistrada V4 was the first in decades to not use desmodromic valves, the owner rewarded, inter alia, with recommended maintenance intervals of 60,000 km (37,500 miles), a considerable advance on the traditional 12-18,000 km (7500-11,200 miles).  Advances in engineering techniques have allowed the noise of the desmodromic arrangement to be reduced and there are now four-cylinder Ducatis using the system, appealing to those who lust for top end power.  Among collectors of US muscle cars, Ferraris, Jaguars and such there are those who can think of no more pleasurable way to spend a day than adjusting solid valve lifters or tinkering with an array of carburettors (the fascination of intricacy its own reward), the synchronization of which defy all but the chosen priesthood of such things so Ducati seems likely to offer the devoted their desmodromics as long as such things remain somewhere lawful.

Fishtail

Fishtail (pronounced fish-teyl)

(1) As "to fishtail" or "fishtailing", to swerve or skid from side to side, as the rear end of a car (an oversteering sequence).

(2) In aviation, to slow an airplane by causing its tail to move rapidly from side to side; such a maneuver.

(3) A gas burner having two jets crossing each other so as to produce a flame resembling a fish's tail.

(4) A device having a long, narrow slot at the top, placed over a gas jet, as of a Bunsen burner, to give a thin, fanlike flame.

(5) In nautical design, a propeller consisting of a single blade that oscillates like the tail of a fish while swimming.

(6) In jewelry design, a setting consisting of four prominent triangular corner prongs to hold the stone.

(7) In dance, a step in ballroom dancing in which the feet are quickly crossed

(8) In fashion design, a dress or skirt with a flowing, scalloped hemline sometimes longer at the back than at the front, flaring usually from about the knee.

(9) A kind of chisel with a flared blade.

(10) In hair-styling, a two-stranded braid.

1400–1450: From the late Middle English, the construct being fish + tail.  Fish the noun (strictly a vertebrate which has gills and fins adapting it for living in the water but the word came to be more widely applied, zoologically) was from the Middle English fisch, from the Old English fisċ (fish), from the Proto-West Germanic fisk, from the Proto-Germanic fiskaz (fish) (source also of the Old Saxon, the Old Frisian & the Old High German fisc, the Old Norse fiskr, the Middle Dutch visc, the Dutch vis, the German Fisch & the Gothic fisks) and related to the West Frisian fisk, the Danish, Norwegian & Swedish fisk, the Irish iasc & the Latin piscis; Root probably either the primitive Indo-European peysḱ- (fish) or pisk (a fish) but at least one etymologist, on phonetic grounds, has suggested it might be a northwestern Europe substratum word.  Fish the verb is from the Old English fiscian (to fish, to catch or try to catch fish), and was cognate with the Old Norse fiska, the Old High German fiscon, the German fischen & the Gothic fiskon, all derived from the noun.  In popular use, since Old English, fish has been used to apply to "any animal that lives entirely in the water," hence shellfish & starfish although, in English there’s an early fifteenth century document which describes fishes bestiales as "water animals other than fishes").  Today, aquatic mammals like dolphins are presumed fish by some.  The plural is fishes, but in a collective sense, or in reference to fish meat as food, the singular fish is commonly used as a plural so, except for the pedants, that battle is lost.  Regarding the heavens, the constellation Pisces is from the late fourteenth century.  The hyphenated form fish-tail is common.

An artist's depiction of Lindsay Lohan as mermaid.

Tail was from the Middle English tail, tayl & teil (hindmost part of an animal), from the Old English tægl & tægel (tail), from the Proto-Germanic taglaz & taglą (hair, fiber; hair of a tail) (source also of the Old High German zagal, the German Zagel (tail), the dialectal German Zagel (penis), the Old Norse tagl (horse's tail) and the Gothic tagl (hair), from the primitive Indo-European doklos, from a suffixed form of the roots dok & dek- (something long and thin (referring to such things as fringe, lock of hair, horsetail & to tear, fray, shred)), source also of the Old Irish dual (lock of hair) and the Sanskrit dasah (fringe, wick).  It was cognate with the Scots tail (tail), the Dutch teil (tail, haulm, blade), the Low German Tagel (twisted scourge, whip of thongs and ropes; end of a rope), the dialectal Danish tavl (hair of the tail), the Swedish tagel (hair of the tail, horsehair), the Norwegian tagl (tail), the Icelandic tagl (tail, horsetail, ponytail), and the Gothic tagl (hair). In some senses, development appears to have been by a generalization of the usual opposition between head and tail.  The Oxford English Dictionary (OED) suggest the primary sense, at least among the Germanic tongues, seems to have been "hairy tail," or just "tuft of hair," but already in Old English the word was applied to the hairless "tails" of worms, bees etc.  The alternative suggestion is that the notion common to all is that of the "long, slender shape."  It served as an adjective from the 1670s.  A long obsolete Old English word for tail was steort.  Fishtail is a noun & verb and fishtailed & fishtailing are verbs; the noun plural is fishtails.

1952 Vincent Black Shadow with “fishtail” exhaust extension.

An unmistakable look, the “fishtail tip” polarizes opinion; it really is a “love it or hate it” fitting but they retain some popularity in the Harley Davidson community, a crew as devoted to their machines as any.  There are many modern takes on the design; while all feature the characteristic vertical, narrow flare in the distinctive shape, many are upswept and some protrude from the back more than others.  As well as the look, fishtails often are advertised on the basis of their sound (loud) and internally, are tuned to create different resonances, the ears of Harley Davidson riders as sensitive to the variations as are collectors of Stradivarii.

1937 Norton Model 30 International with Brooklands Can (technically the Brooklands Silencer) (left) and 1934 MG Magnette 'K3' Specification Supercharged Roadster (right).

One of the world’s first dedicated venues for motorsports and aviation, England’s Brooklands motor racing circuit was built in 1907, predating the Indianapolis Motor Speedway by two years.  Located in what had until then been the quiet little hamlet of Weybridge in the county of Surrey, some 20 miles (12 km) south-west of London, it sits 9 miles (14.5 km) south of Heathrow Airport and a portion of the original outer circuit (originally 2.75 miles (4.4 km) in length with the banking in places rising almost 30 feet (9.1 m) high) still exists.  Then, as now, Motorsport was a very noisy business and as the sport boomed in popularity after World War I (1914-1918), the tolerance of the inhabitants of Weybridge must have been tested because there’s a record of complaints about the noise (especially on Sundays and during the 24 hour events sometimes run) and eventually, in September 1924, a group commenced in the High Court an action in the tort of nuisance.  By July 2025 (reasonably brisk by the standards of the legal system), a settlement was agreed which included a permanent injunction limiting the days and hours of operation and the creation of the novel “Brooklands Can”, a design of muffler which could be adapted to both cars and motorcycles.

1937 Norton Model 30 International with Brooklands Can (Left), diagram of Brooklands Can for a number of contemporary 1930s MGs close to the Magnette NE (1934) specification (centre) and a Luminous White male Guppy (right).

What the High Court’s injunction required was even on those days when racing was allowed, noise levels had to be reduced and the obvious solution was a muffler (in England then known optimistically as “silencers”) and the case turned out to be influential as the century progressed, often cited as the way a court might balance technological progress, any public nuisance created and the right of individuals to the “quiet enjoyment” of life in their homes.  Interestingly, the French (silencieux) and Italians (silenziatore) followed the English practice while the more practical Germans adhered to the realistic literalness of the Americans with Schalldämpfer (sound damper).  All Brooklands cans had two distinguishing characteristics: a rhomboidal receptacle located close to the engines header pipes which emerge from the exhaust manifold and a fishtail tip (although those used on some smaller capacity cars did terminated in a straight “dump pipe” and depending on the displacement (and thus the volume of exhaust gasses), the dimensions of the apparatus varied.  The “silencer” didn’t make the machines “quiet” in the accepted sense of the word; just less noisy.

Tilly Shilling on her Norton N30 500, Brooklands, July 1935.  Note the fishtail Brooklands Silencer.

Ms Beatrice “Tilly” Shilling (1909-1990) was a pre-modern rarity, a female engineer and amateur racing driver.  Even before she gained her MSc (Master of Science) in mechanical engineering, Ms Shilling had been building and racing motorcycles and it was on her modified (at one point she even fitted a supercharger) 490 cm³ Norton M30, she lapped the Brooklands track at 106 mph (171 km/h), a feat for which she was awarded the BMRC (British Motorcycle Racing Club) Brookland Gold Star; she remains only one of three women to have lapped the famous banked circuit “at the ton” before it was closed in 1939.  With the coming of war, she returned the Norton to road use, riding in this form until 1953.

Battle of Britain era Hawker Hurricane Mk IIA and Supermarine Spitfire Mk II.

In 1940, while employed as an engineer at the RAE (Royal Aircraft Establishment) at Farnborough, she worked on the "fuel delivery problem" reported by RAF (Royal Air Force) Fighter Command pilots, the Rolls-Royce Merlin V12s in their Hurricanes an Spitfires "cutting out" for as long as 1½ seconds during a "negative G-force maneuver" (pitching the nose hard down), the fuel being forced upwards to the top of the carburetor's float chamber rather than into the combustion chamber, leading to a loss of power.  If the negative G continued, the fuel would collect in the top of the float chamber, forcing the float to the bottom. This in turn would open the needle valve to maximum, flooding the carburetor with fuel, drowning the supercharger with an over-rich mixture which would shut down the engine, a serious matter in aerial combat.  While 1½ seconds doesn't sound long, in combat at altitude, travelling at hundreds of mph, inches and seconds can be critical and the difference between life and death.  The complete solution for fuel starvation was a pressurized fuel system such as the direct injection used by Daimler-Benz 600-series inverted V12s as used in the German fighters but such a development would take months to design, test, manufacture and install.

RAE Anti "G" carburetor restrictor plate instruction sheet.

As a stop-gap measure, Ms Shilling designed a flow restrictor: a small metal disc with a central orifice, looking much like a plain metal washer.  The restrictor orifice was sized to accommodate just the fuel flow needed for maximum engine power, the setting usually used during dogfights and it solved the immediate, critical, problem of the engine shutdowns following flooding.  Officially named the RAE Restrictor or RAE Anti “G” Carburetor, the device proved popular with pilots, who much preferred to call it Miss Shilling's orifice or the Tilly orifice.  The simple and elegant solution proved effective until pressurized carburetors (essentially throttle-body injection, a simplified version of the Daimler-Benz direct fuel injection) were developed which permitted even inverted flight.  With a backpack of RAE Restrictors, she toured RAF airfields on the same Norton N30 500 on which she'd once lapped Brooklands at 100 mph, instructing and assisting the maintenance crews with the installation of the devices.  Ms Shilling was a serious engineer making an important contribution to the war effort and was not amused by the nicknames for her invention but, reportedly regarded it as something typical of minds of men, rolled her eyes and carried on with her work.  The orifice was but a footnote in the history of the Merlin and the Allied war effort but did typify the improvisation and speed with which British industry developed "quick & dirty" solutions, especially in the early days of the war.

1933 Napier-Railton.

Driven by John Cobb (1899–1952), this car in 1935 set the Brooklands lap record for the Outer Circuit at 143.44 mph (230.84 km/h) a mark which will stand for all time because after being appropriated in 1939 for military purposes, the facility never re-opened.  The Napier-Railton was powered by a W12 (the so-called “broad arrow”) aero engine of 24 litres (1,461 cubic inch) and because the configuration had the cylinders in three banks of four, three of the Brooklands Cans had to be fitted and, with each bank displacing some 8 litres (487 cubic inch), each system was among the largest ever built.  Away from the delicate ears and aspidistras of the Surrey middle class, the machine sometimes ran “unsilenced”, including on the Bonneville Salt Flats where it ran with nothing more open stack exhausts, setting a world 24 hour record at an average speed of 158.6 mph (242 km/h).

The sense in common law of tail (limitation of ownership) which endures mostly in the law of real property began as a legal term in English in the early fourteenth century (late thirteenth in Anglo-French & Anglo-Latin); in almost all cases it was a shortened form of entail.  The verb tail dates from the 1520s and was derived from the noun, the sense originally "attach to the tail", the meaning "move or extend in a way suggestive of a tail" dating from 1781.  The meaning “secretly to follow" is a US colloquial creation from 1907, borrowed from the earlier sense of "follow or drive cattle”.  The saying "tail off” (diminish) was noted in 1854.  The tail of a coin (reverse side; opposite the side with the head, hence “heads or tails”) appears to have been first described that was in the 1680s.  The more predictable "backside of a person, buttocks" is recorded from circa 1300, the slang sense of "pudenda" is from the mid-fourteenth century and as a term to refer to an “act of copulation with a prostitute”, it was first noted in 1846.  From circa 1933 it was applied to mean "woman as sex object" is from 1933.  In printing and typography, tail was the technical term to describe the descending strokes of letters from the 1590s.  As “tails”, the formal dress for men (coat with tails), the first advertisements appeared in 1857.  The tail-race, the part of a mill race below the wheel is from 1776.  The phrase “to turn tail” (take flight) dates from the 1580s and was originally from falconry, later to be adopted by the Admiralty and the army.  The image of the “tail wagging the dog” is from 1907 and was part of the language of political science.

A whale fluking its fluke (left) and 1987 Ford Sierra RS Cosworth (1986-1992).

Among the most photographed “fish tails” are those of whales, once hunted for their meat and oil, they’re now charismatic creatures and among nature’s most prolific content providers, their tails “fluking” (appearing above the surface just as a deep dive is about to begin) long an Instagram staple.  Whales are however not fish, all being mammals, they’re thus within the zoological class Mammalia, not Pisces.  The “whale tail” spoiler first appeared on Porsches in 1974 and is best remembered for its use on the 911 Turbo (930, 1974-1989), a vehicle which gained the nickname “widow-maker” because, in unskilled hands, the quirky handling (the 930 wasn’t exactly a “250 horsepower VW Beetle” but the layout was the same and the inherent characteristics thus exaggerated although (up to a point), well-tamed) could lead to “fishtailing” and worse.  The “whale tail” later evolved into the “tea tray” although the original nickname remains more widely used, even of later variants.

Fish appears often in idiomatic use.  The figurative sense of “fish out of water” (a person in an unfamiliar and awkward situation) is attested from the 1610s, the use extended from circa 1750, usually with a modifier (strange fish, queer fish, cold fish) but from at least 1722 it was used in reference to a person considered desirable to “catch”, a sense preserved in the phrase “plenty more fish in the sea”, a form picked up by one dating site.  To “drink like a fish” (one with a habitually high consumption of alcohol) is from 1744 and the “fishy story” (an incredible or extravagant narration) was first noted in 1819, a US colloquial form based on the tendency of anglers to exaggerate the size of “the one that got away”.  Having “other fish to fry” (having other things which demand one’s attention) is from the 1650s.  In optics, the fish-eye lens was patented in 1959.  Fish-and-chips seem first to have been advertised in 1876 and fish-fingers were first sold in 1962.

Lindsay Lohan in fishtail dresses.  Herbie: Fully Loaded premiere, El Capitan Theatre, Hollywood Boulevard, Los Angeles, June 2005; Vanity Fair Oscar Party, Morton’s West Hollywood, Los Angeles, March 2006; Liz & Dick premiere, Beverly Hills Hotel, Los Angeles, November 2012.

A fitted bodycon construction, the distinguishing feature of the fishtail dress is the flowing, scalloped hemline, often longer at the back and tending to flare from around the knee-line.  Because a successful implementation of the style depends most on length and volume, most fishtail dresses are floor length, many better described as gowns although some have tried shorter variations.  The bodice can vary but fitted waists are the most frequently seen.  The design was originally called the "fishtail train" and the early versions, first seen in the 1870s, all featured the asymmetric extension at the back and it wasn’t until the turn of the century the flaring lowered from mid-thigh to the knee.  Prior to the Victorian era, trains were not unknown but they were then worn only as evening gowns and were really an addition to existing garments.

Promotional shot of the author for Fierce: The History of Leopard Print (2018) by Jo Weldon (b 1962), founder of the New York School of Burlesque.

Some in the industry refer to the “fishtail” as the “trumpet” or the more charming mermaid and there are those who insist on distinguishing between the three, based usually from the point at which the flare begins but the distinction escapes the many who use the terms interchangeably, regarding all as variations on a theme.  However described, the great advantage of the lines is that they create, on a suitable frame, an hourglass figure and one with a range of definition, all determined by the point at which the flare begins and the volume of material chosen for the fishtail; done properly it can render a feminine and flawless silhouette, perhaps the most persuasive reason it’s chosen by so many brides.  Sore however are probably too easily persuaded, the fishtail really not suited to those either too short or too wide.  Successfully to wear a fishtail, it’s not necessary to be truly statuesque or actually thin but beneath a certain height, one starts to look like part of a condiment set; one must be realistic about what shapewear can achieve.  The recommendation is that the style can be worn by those of at least average height and it works best on those who are slim with small or medium size hips.  A good seamstress can adapt things to better suit other shapes but there’s a law of diminishing returns the more one is removed from the ideal; a deep but narrow cut can disguise only so much.

Fishtail braid in blonde.

The fishtail braid is a variation of the French braid, both with a smoothly woven appearance, the fishtail dividing the hair into two sections instead of the French three.  The technique essentially is that a small piece of each section is passed over to the other, the process repeated until the braid assumes its shape; in the nineteenth century this was known as the "Grecian braid".  The fishtail braid appears intricate because it's built with small strands but hairdressers say it's a simple, and essentially repetitive, nine-step process.  On great advantage of the fishtail is it lends itself well to a looser braid, one which over a couple of days will tend usually (and gradually) to deconstruct into a deliberately messy look, the attraction is technical as well as aesthetic: the messy fishtail is uniquely suited to act as a framework for hair extensions.

(1) Split the hair into two equal strands

(2) Pick up a small section of hair on the right side of the right strand

(3) Cross the small section over and add it to the left strand

(4) Pick up a small section of hair on the left side of the left strand

(5) Cross the small section over and add it to the right strand

(6) Pick up a small section of hair on the right side of the right strand

(7) Cross the small section over and add it to the left strand

(8) Pick up a small section of hair on the left side of the left strand

(9) Cross the small section over and add it to the right strand

(10) Repeat steps 2-9 until the end is reached.