Mansfield

Mansfield (pronounced manz-feeld)

The slang term for the protective metal structures attached to the underside of trucks and trailers, designed to protect occupants of vehicles in “under-run” crashes (the victim’s vehicle impacting, often at mid-windscreen height with the solid frame of the truck’s tray).  A Mansfield bar, technically is called the RUPS (Rear Underrun Protection System).

1967: The devices are known as “Mansfield” bars because interest in the system was heightened after the death of the actress Jayne Mansfield (1933-1967), killed in an under-run accident on 28 June 1967.  The origin of the surname Mansfield is habitational with origins in Mansfield, Nottinghamshire. The early formations, recorded in the thirteenth century Domesday Book, show the first element uniformly as the Celtic Mam- (mother or breast (Manchester had a similar linkage)) with the later addition of the Old English feld (pasture, open country, field) as the second element.  The locational sense is thus suggestive of an association of the field by a hill called “Man”.  The etymology, one suspects, would have pleased Jayne Mansfield.

The "Mansfield crash" aftermath, 1966 Buick Electra 225, 28 June, 1967 (left) and the much re-printed photograph (right) of Sofia Loren (b 1934, left) and Jayne Mansfield (right), Romanoff's restaurant, Beverly Hills, Los Angeles, April 1957.  Ms Loren's sideways glance, one of the most famous in Hollywood's long history of such looks has been variously interpreted as "sceptical", "disapproving" and "envious", the latter a view probably restricted to men.  Ms Loren herself explained her look as one of genuine concern the pink satin gown might not prove equal to the occasion.  On the night, there were several photographers covering the event and images taken from other angles illustrate why that concern was reasonable. 

On 28 June 1967, Jayne Mansfield was a front-seat passenger in a 1966 Buick Electra 225 four-door hardtop, en route to New Orleans where she was next day to be the subject of an interview.  While cruising along the highway at around two in the morning, the driver failed to perceive the semi-truck in front had slowed to a crawl because an anti-mosquito truck ahead was conducting fogging and blocking the lane.  The mist from the spray masked the truck's trailer and, the driver unable to react in time, the car hit at high speed, sliding under the semi-trailer, killing instantly the three front-seat occupants.  Although the myth has long circulated she was decapitated, an idea lent some credence by the visual ambiguity of photographs published at the time, while it was a severe head trauma, an autopsy determined the immediate cause of death was a "crushed skull with avulsion of cranium and brain".  The phenomenon of the “under-run” accident happens with some frequency because of a co-incidence of dimensions in the machines using the roads.  Pre-dating motorised transport, loading docks were built at a height of around four feet (48 inches; 1.2 m) because that was the most convenient height for men of average height engaged in loading and unloading goods.  Horse-drawn carts and later trucks were built to conform to this standard so trays would always closely align with dock.  Probably very shortly after cars and trucks began sharing roads, they started crashing into each other and, despite impact speeds and traffic volumes being relatively low, the under-run accident was noted in statistics as a particular type as early as 1927.

In the post-war years, speeds and traffic volumes rose and, coincidentally, the hood-lines (bonnet) on cars became lower, the windscreen now often somewhere around four feet high so the under-run vulnerability was exacerbated, cars now almost designed to slide under a truck to the point of the windscreen, thus turning the tray into a kind of horizontal guillotine, slicing into the passenger compartment at head-height.  That’s exactly how Jayne Mansfield died and while the Buick was an imposing 223.4 inches (5,674 mm) in length, it was much lower than the sedans of earlier generations.  As a footnote, when introduced in 1959, the Electra 225 (1959-1980) gained its name from being 225.4 inches (5,725 mm) long and while during the 1960s it would be just a little shorter, by 1970 it did again deserve the designation even by 1975 growing to 233.4 inches (5,928 mm), making it the longest four-door hardtop ever built by GM (General Motors), a record unlikely to be broken.  The use of length as a model name was unusual but others have done it, most recently the Maybach (2002-2013), a revived marquee intended by Mercedes-Benz as a competitor for Rolls-Royce & Bentley.  The Maybach was an impressive piece of engineering but its very existence only devalued the Mercedes-Benz brand and was an indication the MBAs who has supplanted the engineers as the company’s dynamic really didn’t have a clue, even about marketing which was supposed to be their forte.  The Maybachs were designated “57” & “62”, the allusion to their length (5.7 & 6.2 metres respectively).  Between 1948-2016, many Land Rovers were given model designation according to their wheelbase (with a bit or rounding up or down for convenience) in inches, thus "80", "88", "110" etc. 

Rear under-run Mansfield bar.

The US authorities did react, federal regulations requiring trucks and trailers be built with under-ride guards (reflectorized metal bars hanging beneath the back-end of trailers) passed in 1953, but the standards were rudimentary and until the incident in 1967, little attention was paid despite similar accidents killing hundreds each year.  The statistics probably tended to get lost among the ever-increasing road-toll, cars of the era being death traps, seat belts and engineering to improve crashworthiness almost unknown.  Predictably, the industry did its math (which took longer in the pre-spreadsheet era) and argued, given that above a certain speed impacts would still cause fatalities, the costs of retro-fitting heavy vehicles would be disproportionate to the number of lives saved or injuries avoided or made less severe.  It's macabre math but it part of business and the most infamous example was Ford's numbers people working out it was projected to be cheaper to pay the costs associated with people being incinerated in rear-ended Pintos than it would be to re-engineer the fuel tank.   

The Mansfield bar works by preventing the nods of the car being slung under the truck, protecting the passenger compartment from impact.

After 1967, although regulations were tightened and enforcement, though patchy, became more rigorous, deaths continued and in the US there are still an average of two-hundred fatalities annually in crashes involving Mansfield Bars.  There are proposals by the Federal Motor Carrier Safety Administration (FMCSA) to include Mansfield Bars on any truck inspection and suggesting to improve the design to something more effective, the devices since 1963 little more than brute force impact barriers and there’s interest in spring-loaded devices which would absorb more of the energy generated in a crash.  Coincidentally, the increasing preference by consumers for higher, bluff-fronted SUVs and light (a relative term, the "light" pick-up trucks popular in the US market regarded as "big" just about everywhere else, even in the Middle East, Australia and New Zealand where they're also sold) trucks has helped improve this aspect or road safety.

There’s concern too about side impacts.  Only a very small numbers of trucks have ever been fitted with any side impact protection and this omission also make corner impacts especially dangerous.  The cost of retro-fitting side (and therefore corner) Mansfield bars to a country’s entire heavy transport fleet would be onerous and it may be practical to phase in any mandatory requirements only over decades.

A photograph of a parked car & truck, the juxtaposition illustrating the limits of the protection afforded, especially in cases when the truck's tray extends well beyond the rear axle-line.  The moving truck was one of two hired by Lindsay Lohan (b 1986) when in early 2012 she moved out of 419 Venice Way, Venice Beach, Los Angeles where during 2011 she lived (in the house to the right; the semi-mirrored construction sometimes called a “pigeon pair”) next door to former special friend DJ Samantha Ronson (b 1977) who inhabited the one to the left (417).  She was compelled to move after a “freemason stalker threatened to kill her”, proving the Freemasons will stop at nothing.

Truganina, Melbourne, Australia, 4 June, 2025.

Mansfield bars can reduce injuries & fatalities but if the energy in a crash is sufficient (a product of mass, speed and the angle of contact at the point of impact), the consequences will still be catastrophic.  In the early morning of 4 June 2025 in Melbourne, Australia, a Mustang coupé crashed into the right-rear corner of a parked truck, the passenger (sitting in the left front seat of the RHD (right-hand drive) car) killed instantly while the driver was taken to hospital with non-life-threatening injuries.

Truganina, Melbourne, Australia, 4 June, 2025.

The damage sustained by the vehicles was what would be expected in the circumstances, the truck (build on a rigid steel ladder-chassis with a steel-framed freight compartment atop) suffering relatively minor damage while the Mustang’s (built to modern safety standards with the structure outside the passenger compartment designed as a “crumple zone” intended to absorb an impact’s energy before it reaches the occupants) left-front corner substantially was destroyed.  The right-side portion of the Mansfield bar which was hit was torn off in the impact, illustrating the limitations of the technology when speeds are very high, the same reason the car’s “safety cell” was unable to prevent a fatality.

The Seven Ups (1973).

Footage of crashes conducted during testing is illustrative but Hollywood does it better.  In the movie The Seven Ups (1973, produced & directed by Philip D'Antoni (1929-2018), a 1973 Pontiac Ventura Custom, while pursuing a 1973 Pontiac Grand Ville, crashes into a truck with an impact similar to the one in which Jayne Mansfield died; this being Hollywood, the driver emerges bruised & bloodied but intact.  In the movie, the truck is not fitted with a Mansfield bar but if the speed at the point of impact is sufficient, the physics are such that even such a device is unlikely to prevent fatalities.  A re-allocation of a name used on Pontiac’s full-sized (B-Body) line between 1960-1970, the Ventura (1971-1977) was built on the GM (General Motors) compact platform (X-Body), until then exclusive to the Chevrolet Nova (1968-1979 and badged between 1962-1968 as the Chevy II).

Quadraphonic

Quadraphonic (pronounced kwod-ruh-fon-ik)

(1) Of, noting, or pertaining to the recording and reproduction of sound over four separate transmission or direct reproduction channels instead of the customary two of the stereo system.

(2) A quadraphonic recording.

(3) A class of enhanced stereophonic music equipment developed in the 1960s.

1969: An irregular formation of quadra, a variant (like quadru) from the older Latin form quadri- (four) + phonic from the Ancient Greek phonē (sound, voice).  All the Latin forms were related quattor (four) from the primitive Indo-European kwetwer (four).  Phonē was from the primitive Indo-European bha (to speak, tell, say) which was the source also of the Latin fari (to speak) and fama (talk, report).  Phonic, as an adjective in the sense of “pertaining to sound; acoustics" was used in English as early as 1793. Those for whom linguistic hygiene is a thing approved not at all of quadraphonic because it was a hybrid built from Latin and Greek.  They preferred either the generic surround sound which emerged later or the pure Latin lineage of quadrasonic (sonic from sonō (make a noise, sound)) which appeared as early as 1970 although it seems to have been invented as a marketing term rather than by disgruntled pedants.  Quadraphonic, quadrasonic and surround sound all refer to essentially the same thing: the reproduction of front-to-back sound distribution in addition to side-to-side stereo.  In live performances, this had been done for centuries and four-channel recording, though not mainstream, was by the 1950s, not uncommon.  Quadraphonic is and adjective but had been used as a noun; the (equally irregular) noun plural is quadraphonics.

Surround sound

Quadraphonic was an early attempt to mass-market surround sound.  It used four sound channels with four physical speakers intended to be positioned at the four corners of the listening space and each channel could reproduce a signal, in whole or in part, independent of the others.  It was briefly popular with manufacturers during the early 1970s, many of which attempted to position it as the successor to stereo as the default standard but consumers were never convinced and quadraphonic was a commercial failure, both because of technical issues and the multitude of implementations and incompatibilities between systems; many manufacturers built equipment to their own specifications and no standard was defined, a mistake not repeated a generation later with the CD (compact disc).  Nor was quadraphonic a bolt-on to existing equipment; it required new, more expensive hardware.

Quadraphonic audio reproduction from vinyl was patchy and manufacturers used different systems to work around the problems but few were successful and the physical wear of vinyl tended always to diminish the quality.  Tape systems also existed, capable of playing four or eight discrete channels and released in reel-to-reel and 8-track cartridge formats, the former more robust but never suited to the needs of mass-market consumers.  The rise of home theatre products in the late 1990s resurrected interest in multi-channel audio, now called “surround sound” and most often implemented in the six speaker 5.1 standard.  Modern electronics and the elimination of vinyl and tape as storage media allowed engineers to solve the problems which beset quadraphonic but there remain audiophiles who insist, under perfect conditions, quadraphonic remains the superior form of audio transmission for the human ear.

Highway Hi-Fi record player in 1956 Dodge.

First commercially available in 1965, the eight-track cartridge format (which would later become the evil henchman of quadraphonic) convinced manufacturers it was the next big thing and they rushed to mass-production and one genuine reason for the appeal was that the 8-track cartridge was the first device which was practical for use as in-car entertainment.  During the 1950s, the US car industry had offered the option of record players, neatly integrated into the dashboard and in the relatively compact space of a vehicle's interior, the sound quality could be surprisingly high.  Although not obviously designed with acoustic properties optimized for music, the combination of parallel flat surfaces, a low ceiling and much soft, sound absorbing material did much to compensate for the small size and range offered by the speakers.  However, although they worked well when sitting still in showroom or in certain vehicles, on the road things could be different.  The records (the same size as the classic 7 inch (180 mm) 45 rpm "singles") played by means of a stylus (usually called "the needle") which physically traced the grooves etched into the plastic disks rotating at 16.66 rpm which, combined with an etching technique called "ultra micro-grooving" meant the some 45 minutes of music were available, a considerable advance on the 4-5 minutes of the standard single.  The pressings were also thicker than other records, better to resist the high temperatures caused by heat-soak from the engine and the environment although, in places like Arizona, warping was soon reported.  To keep the stylus in the track, the units were fitted with a shock-absorbing, spring enclosure and a counterweighted needle arm.  Improbably, in testing, the system performed faultlessly even under the most adverse road conditions so the designers presented the product for corporate approval.  At that point there was a delay because the designers worked for the Colombia Broadcasting Corporation (CBS) which had affiliations with thousands of radio stations all over the country and no wish to cannibalize their own markets; if people could play records in their cars, the huge income stream CBS gained from advertising would be threatened as drivers tuned out.  The proposal was rejected.

Highway Hi-Fi record player in 1956 Plymouth.

Discouraged but not deterred, the engineers went to Detroit and demonstrated the players to Chrysler which had their test-drivers subject the test vehicles to pot-holes, railway tracks and rolling undulations.  The players again performed faultlessly and Chrysler, always looking for some novelty, placed an order for 18,000, a lucrative lure which convinced even CBS to authorize production, their enthusiasm made all the greater by the proprietary format of the disks which meant CBS would be the exclusive source.  So, late in 1956, Chrysler announced the option of "Highway Hi-Fi", a factory-installed record player mounted under the car's dashboard at a cost of (US$200 (some US$1750 in 2023 terms)).  Highway Hi-Fi came with six disks, the content of which reflected the reactionary tastes of CBS executives and their desire to ensure people still got their popular music from radio stations but the market response was positive, Chrysler selling almost 4000 of the things in their first year, the early adopters adopting with their usual alacrity.

The second generation of players used standard 45 rpm singles: Austin A55 Farina (left) and George Harrison's (1943–2001) Jaguar E-Type S1 (right); all four Beatles had the players fitted in their cars and lead guitarist Harrison is pictured here stocking his 14-stack array.  The lady on the left presumably listened to different music than the Beatle on the right (although their in-car hardware was identical) but tastes can't always be predicted according to stereotype; although he disapproved of most modern music, Rudolf Hess (1894–1987; Nazi deputy Führer 1933-1941) told the governor of Spandau prison (where he spent 40 of his 46 years in captivity) he enjoyed The Beatles because their tunes "were melodic".  

At that point, problems surfaced.  Tested exclusively in softly-sprung, luxury cars on CBS's and Chrysler's executive fleets, the Highway Hi-Fi had to some extent been isolated from the vicissitudes of the road but when fitted to cheaper models with nothing like the same degree of isolation, the styluses indeed jumped around and complaints flowed, something not helped by dealers and mechanics not being trained in their maintenance; even to audio shops the unique mechanism was a mystery.  Word spread, sales collapsed and quietly the the option was withdrawn in 1957.  The idea however didn't die and by the early 1960s, others had entered the field and solved most of the problems, disks now upside-down which made maintaining contact simpler and now standard 45 rpm records could be used, meaning unlimited content and the inherent limitation of the 4 minute playing time was overcome with the use of a 14-disk stacker, anticipating the approach taken with CDs three decades later.  Chrysler tried again by the market was now wary and the option was again soon dropped.

1966 Ford Mustang with factory-fitted 8-track player.

Clearly though, there was demand for in-car entertainment, the content of which was not dictated by radio station programme directors and for many there were the additional attractions of not having to endure listening either to advertising or DJs, as inane then as now.  It was obvious to all tape offered possibilities but although magnetic tape recorders had appeared as early as 1930s, they were bulky, fragile complicated and expensive, all factors which mitigated against their use as a consumer product fitted to a car.  Attention was thus devoted to reducing size and complexity so the tape could be installed in a removable cartridge and by 1963, a consortium including, inter alia, Lear, RCA, Ford & Ampex had perfected 8-track tape which was small, simple, durable and able to store over an hour of music.  Indeed, so good was the standard of reproduction that to take advantage of it, it had to be connected to high quality speakers with wiring just as good, something which limited the initial adoption to manufacturers such as Rolls-Royce and Cadillac or the more expensive ranges of others although Ford's supporting gesture late in 1965 of offering the option on all models was soon emulated.  Economies of scale soon worked its usual wonders and the 8-track player became an industry standard, available even in cheaper models and as an after-market accessory, some speculating the format might replace LP records in the home.

Lindsay Lohan's A Little More Personal (Raw) as it would have appeared if released in the 8-Track format.

That never happened although the home units were widely available and by the late 1960s, the 8-track was a big seller for all purposes where portability was needed.  It maintained this position until the early 1970s when, with remarkable suddenness, it was supplanted the the cassette, a design dating from 1962 which had been smaller and cheaper but also inferior in sound delivery and without the broad content offered by the 8-track supply system.  That all changed by 1970 and from that point the 8-track was in decline, reduced to a niche by late in the decade, the CD in the 1980s the final nail in the coffin although it did for a while retain an allure, Jensen specifying an expensive Lear 8-track for the Interceptor SP in 1971, despite consumer reports at the time confirming cassettes were now a better choice.  The market preferring the cheaper and conveniently smaller cassette tapes meant warehouses were soon full of 8-track players and buyers were scarce.  In Australia, GMH (General Motor Holden) by 1975 had nearly a thousand in the inventory which also bulged with 600-odd Monaro body-shells, neither of which were attracting customers.  Fortunately, GMH was well-acquainted with the concept of the "parts-bin special" whereby old, unsaleable items are bundled together and sold at what appears a discount, based for advertising purposes on a book-value retail price there’s no longer any chance of realizing.

1976 Holden HX LE

Thus created was the high-priced, limited edition Holden LE (not badged as a Monaro although it so obviously looked like one that they've never been known as anything else), in "LE Red" (metallic crimson) with gold pin-striping, Polycast "Honeycomb" wheels, fake (plastic) burl walnut trim, deep cut-pile (polyester) carpet and crushed velour (polyester) upholstery with plaid inserts over vinyl surrounds in matching shades; in the 1970s, this was tasteful.  Not exactly suited to the image of luxury were the front and rear spoilers but they too were sitting unloved in the warehouse so they became part of the package and, this being the 1970s, rear-seat occupants got their own cigar lighter, conveniently located above the central ashtray.  Not designed for the purpose, the eight-track cartridge player crudely was bolted to the console but the audio quality was good and five-hundred and eighty LEs were made, GMH pleasantly surprised at how quickly they sold.  When new, they listed at Aus$11,500, a pleasingly profitable premium of some 35% above the unwanted vehicle on which it was based.  These days, examples are advertised for sale for (Aus$) six-figure sums but those who now buy a LE do so for reasons other than specific-performance.  Although of compact size (in US terms) and fitted with a 308 cubic inch (5.0 litre) V8, it could achieve barely 110 mph (175 km/h), acceleration was lethargic by earlier and (much) later standards yet fuel consumption was very high; slow and thirsty the price to be paid for the early implementations of the emission control devices bolted to engines designed during more toxic times.

1976 Holden HX LE Polycast "Honeycomb" wheel (14 x 7").

The Polycast process used a conventional steel wheel with a decorative face of molded polyurethane, attached with mechanical fasteners or bonded using adhesives (in some, both methods were applied) and although some snobs still call them "fake alloy" wheels, legitimately, they're a category of their own.  Because the rubbery, molded plastic fulfilled no structural purpose, designers were able to create intricate shapes which would then have been too delicate or complex to render (at an acceptable cost) in any sort of metal.  By consensus, some of the Ploycast wheels were among the best looking of the decade and, unstressed, they were strong, durable and long-lasting while the manufacturers liked them because the tooling and production costs were much lower than for aluminium or magnesium-alloy.  Another benefit was, being purely decorative (essentially a permanently attached wheelcover), their use faced no regulatory barriers; US safety rules were even then strict and Citroën at the time didn't both seeking approval for the more exotic "resin" wheels offered in Europe on the SM).

Aftermath of the pace car crash, Indianapolis 500, 29 May 1971; dozens were injured but there were no fatalities, despite impact with the well-populated camera stand being estimated at 60 mph (100 km/h).

The Holden LE's wheels came straight from the Pontiac parts bin in the US where they'd first appeared on the 1971 Firebird Trans-Am.  The concept proved popular with manufacturers and a set of Motor Wheels' "Exiter" (14" x 7", part number 36830 and advertised also as "Exciter") was fitted to the Dodge Challenger Pace car which crashed during the 1971 Indianapolis 500.  The crash was unrelated to the wheels, the driver (one of the Dodge dealers providing the pace car fleet) blaming the incident on somebody moving the traffic cone he'd used in practice as his pit-lane braking marker.    Motor Wheel's advertising copy: “What wheel can survive this beating?” and “...the new wheel too tough for the 'mean machine'” predated the crash at Indianapolis and was intended to emphasise the strength of the method of construction.

Twenty years on, the “parts bin special” idea was a part of local story-telling.  Although most doubt the tale, it's commonly recounted the 85 HSV VS GTS-R Commodores Holden built in 1996 were all finished in the same shade of yellow because of a cancelled order for that number of cars in "taxi spec", the Victorian government having mandated that color for the state's cabs.  While a pleasing industry myth, most suspect it's one of those coincidences and the government's announcement came after the bodies for the GTS-R had already been painted.  Being "taxi yellow" doesn't appear to have deterred demand and examples now sell for well into six figures (in Aus$).      

1971 Holden HQ Monaro LS 350

The overwrought and bling-laden Holden LE typified the tendency during the 1970s and of US manufacturers and their colonial off-shoots to take an elegant design and, with a heavy-handed re-style, distort it into something ugly.  A preview of the later “malaise era” (so named in the US for many reasons), it was rare for a facelift to improve the original.  The HQ Holden (1971-1974) was admired for an delicacy of line and fine detailing; what followed over three subsequent generations lacked that restraint although to be fair, while the last of the series (HZ, 1977-1980) ascetically wasn't as pleasing as the first, dynamically, it was much-improved.   

1973 Ford Falcon XA GT Hardtop (RPO83).

In the era of the LE, Ford Australia had it's own problem with unwanted two-door bodyshells.  Released too late to take advantage of what proved a market fad, Ford’s Falcon Hardtops (XA; 1972-1973, XB; 1973-1976 & XC; 1976-1979) never enjoyed the success of Holden’s Monaro (1968-1976), Chrysler’s Valiant Charger (1971-1978) or even that of Ford’s own, earlier Falcon Hardtop (XM; 1964-1965 & XP; 1965-1966).  The public’s increasing and unpredicted uninterest in the style meant that by 1976, like Holden, Ford had languishing in unwanted in their hands hundreds of body-shells for the big (in Australian terms although in the US they would have been classed “compacts”) coupés.  When released in 1972 Ford’s expectation was it would every year sell more than 10,000 Hardtops but that proved wildly optimistic and not even discounting and some “special editions” did much to stimulate demand.  By 1977 sales had dropped to a depressing 913 and with over 500 bodies in stock, the projection no more than 100 would attract buyers meant a surplus of 400; an embarrassing mistake.

Edsel Ford II with Falcon Cobra #001, publicity shot, Ford Australia's Head Office, Campbellfield, Victoria.  The badge below the Cobra decal reads 5.8; Australia switched to the metric system in 1973 but because of the nature of the machines, almost always the V8s are described either as 302 (4.9) or 351 (5.8), cubic inches being a muscle car motif. 

Scrapping them all had been discussed but in Australia at the time was Edsel Ford II (b 1948), great-grandson of Henry Ford (1863-1947), grandson of Edsel Ford (1893–1943) and the only son of Henry Ford II (1917–1987).  The scion had been sent to southern outpost to learn the family business and been appointed assistant managing director of Ford Australia; his solution profitably to shift the surplus hardtops was hardly original but, like many sequels, it worked.  What Edsel Ford suggested was to use the same approach which in 1976 had been such a success when applied in the US to the Mustang II (1973-1978): Create a dress-up package with the motifs of the original Shelby Mustangs (1965-1968), the most distinctive of which were the pair of broad, blue stripes running the vehicle’s full length.  In truth, the stripes had been merely an option on the early Shelby Mustangs but so emblematic of the breed did they become it’s now rare to see one un-striped.  The blinged-up Mustang IIs had been dubbed “Cobra II” and although mechanically unchanged, proved very popular.  One (unverified) story which is part of industry folklore claims the American’s suggestion was initially rejected by local management and discarded before a letter arrived from Ford’s Detroit head office telling the colonials that if Edsel Ford II wanted a Falcon Cobra with stripes, it must be done.  As Edsel's father once told a Lee Iacocca (1924–2019) who seemed to be getting ideas above his station: "Don't forget my name is on the building". 

Falcon Cobra #31.  The rear-facing bonnet (hood) scoop was the most obvious visual clue identifying the Option 97 (#002-031) cars although the after market responded and it became possible to buy replica scoops as well as the decals and plaques for those who wanted their own "Cobra look".

The Australian cars thus came to be “Cobra” and as well as providing a path to monetizing what had come to be seen as dead stock, the cars would also be a platform with which Ford could homologate some parts for use in racing.  The latter task was easy because in November 1977 Ford had built 13 “special order” XC Hardtops which conformed with the “evolution” rules of the Confederation of Australian Motor Sport (CAMS, then the regulatory body) for homologating parts for Group C touring car events.  Cognizant of the furore which had erupted in 1972 when high-output engines were homologated in road cars, the changes were mostly about durability and included enlarged rear wheel wells to accommodate wider wheels and tyres, a reverse hood (bonnet) scoop which drew desirable cool-air from the low-pressure area at the base of the windscreen, twin electric fans (switchable from the cockpit) which replaced the power-sapping engine-driven fan, a front tower brace (K-brace) which stiffened the body structure, an idler arm brace and front and rear spoilers.

Falcon Cobra #094 which was one of the "fully optioned" of the Option 96 build (#081-200 including the 351 V8, air-conditioning, power steering & power windows).

A prototype Falcon Cobra was built in April 1978 with production beginning the following July.  Unusually, all were originally painted Bold Blue before the areas which would become the stripes and the sill & wheel-arch highlights was masked with a coating of Sno White was painted over the top (thin Olympic (Blaze) Blue accent stripes separated the colors and “Cobra” decals were fitted to the sides and rear).  Each of the 400 built was fitted with a sequentially numbered plaque (001 to 400) on the dash and the production breakdown was:

#001: Created for promotional use, it was allocated for the photo-sessions from which came the images used in the first brochures (351 automatic).

#002-031: The Option 97 run which contained the parts and modifications intended for competition and produced in conformity with CAMS’s “evolution” rules (351 manual).

#032-041: 351 manual with air-conditioning (A/C) & power steering (P/S).

#042-080: 351 manual with A/C, P/S & power windows (P/W).

#081-200: 351 automatic with A/C, P/S & P/W.

#201-300: 302 manual.

#301-360 (except 351): 302 automatic with A/C & P/S.

#351: 351 manual.

#361-400: 302 automatic with A/C, P/S & P/W.

Moffat Ford Dealers team cars in the Hardie-Ferodo 1000 at Bathurst, finishing 1-2 in 1977 (left) and on the opening lap in 1978 (right).  In 1978, the cars (actually 1976 XB models modified to resemble XCs) matched their 1977 qualifying pace by starting second & third on the grid but in the race both recorded a DNF (did not finish). 

The Option 97 run (#002-031) included the modifications fitted to the 13 cars built in November 1997 but also included was engine & transmission oil coolers, a tramp rod (fitted only to the left-side because most racing in Australia is on anti-clockwise circuits and most turns thus to the left) and a special front spoiler which directed cooling air to the front brakes.  Visually, the Option 97 run was differentiated from the rest by the (functional) bonnet scoop and a pair of Scheel front bucket seats (part number KBA90018) in black corduroy cloth. Collectively, the 370 Option 96 and 30 Option 97 made up the 400 SVP (Special Value Pack) that was the Falcon Cobra.  The Cobra’s blue & white livery appeared on the race tracks in 1978 but the best known (the pair run by Allan Moffat's (v 1939) “Moffat Ford Dealers” team were actually modified XB Hardtops built in 1976 and the same vehicles which had completed the photogenic 1-2 at Bathurst in 1977.

Sunroof

Sunroof (pronounced suhn-roof)

(1) A section of an automobile roof (sometimes translucent and historically called a moonroof) which can be slid or lifted open.

(2) In obstetrics, a slang term used by surgeons to describe the Caesarean section.

1952: A compound word, the construct being sun + roof.  Sun was from the Middle English sonne & sunne, from the Old English sunne, from the Proto-West Germanic sunnā, from the Proto-Germanic sunnǭ, from the primitive Indo-European shwen-, oblique of sóhw (sun).  The other forms from the Germanic included the Saterland Frisian Sunne, the West Frisian sinne, the German Low German Sünn, the Dutch zon, the German Sonne and the Icelandic sunna.  The forms which emerged without Germanic influence included the Welsh huan, the Sanskrit स्वर् (svar) and the Avestan xᵛə̄ṇg.  The related forms were sol, Sol, Surya and Helios.  Roof was from the Middle English rof, from the Old English hrōf (roof, ceiling; top, summit; heaven, sky), from the Proto-Germanic hrōfą (roof).  Throughout the English-speaking world, roofs is now the standard plural form of roof.  Rooves does have some history but has long been thought archaic and the idea there would be something to be gained from maintaining rooves as the plural to avoid confusion with roof’s the possessive never received much support.  Despite all that, rooves does seem to appear more than might be expected, presumably because there’s much more tolerance extended to the irregular plural hooves but the lexicographers are unimpressed and insist the model to follow is poof (an onomatopoeia describing a very small explosion, accompanied usually by a puff of smoke), more than one poof correctly being “poofs”.  In use, a poof was understood as a small event but that's obviously a spectrum and some poofs would have been larger than others so it would have been a matter of judgement when something ceased to be a “big poof” and was classed an explosion proper.  Sunroof is a noun (sometimes hyphenated); the noun plural is sunroofs.

1973 Lincoln Continental Mark IV with moonroof.

Sunroofs existed long before 1952 but that was the year the word seems first to have been adopted by manufacturers in Detroit.  The early sunroofs were folding fabric but metal units, increasingly electrically operated, were more prevalent by the early 1970s.  Ford, in 1973, introduced the word moonroof (which was used also as moon roof & moon-roof) to describe the sliding pane of one-way glass mounted in the roof panel over the passenger compartment of the Lincoln Continental Mark IV (1972-1976).  Moonroof soon came to describe any translucent roof panel, fixed or sliding though the term faded from use and all such things tend now to be thought sunroofs.

Open (left) and shut (centre) case: 1976 Lincoln Continental Mark IV (right) with Moonroof.

According to Ford in 1973, a “sunroof” was an opening in the roof with a sliding hatch made from a non-translucent material (metal or vinyl) while a “moonroof” included a hatch made from a transparent or semi-transparent substance (typically then glass).  The advantage the moonroof offered was additional natural light could be enjoyed even if the weather (rain, temperature etc) precluded opening the hatch.  A secondary, internal, sliding hatch (really an extension of the roof lining) enabled the sun to be blocked out if desired and in that configuration the cabin’s ambiance would be the same whether equipped with sunroof, moonroof or no sliding mechanism of any kind.  Advances in materials mean many of what now commonly are called “sunroofs” are (by Ford’s 1973 definition) really moonroofs but use of the latter term is now rare.

Lindsay Lohan standing through a sunroof: Promotional photo-shoot for Herbie Fully Loaded (2005).

Unlike many manufacturers, for many years Volkswagen maintained specific “Sunroof” models in the Beetle (Type 1) range.  When in 1945 the British military occupation forces assumed control of the Volkswagen factory and commenced production of civilian models (those made since 1938 delivered almost exclusively to the German armed forces or Nazi Party functionaries), one of the first organizational changes was to replace Herr Professor Ferdinand Porsche’s (1875–1951) internal type designations with a new set and these included the 115 (Standard Beetle Sunroof Sedan (LHD (left-hand drive)), 116 (Standard Beetle Sunroof Sedan (RHD (right-hand drive)), 117 (Export Deluxe Beetle Sunroof Sedan (LHD) & Export Deluxe Beetle Sunroof Sedan (RHD).  The original sunroof was a folding, fabric apparatus and this remained in use until 1963, a steel, sliding (manually hand-cranked) unit was fitted after the release of the 1964 range.  The Beetle used in the original film (The Love Bug (1968)) was a 1963 Sunroof Beetle; at the time they were readily available at low cost but by 2004-2005 when Herbie: Fully Loaded was in production, they were less numerous and some of those used in the filming were actually 1961 models modified (to the extent required in movies) for purposes of continuity.  Interestingly, the one which appears in most scenes appears to be a 1964 model which implies the folding sunroof was at some point added, not difficult because the kits have long been available.

Caesarean section post-operative scar: C-section scar revision is now a commonly performed procedure.

Manufacturers in the 1970s allocated resources to refine the sunroof because, at the time, the industry’s assumption was the implications of the US NHTSA's (National Highway Traffic Safety Administration) FMVSS (Federal Motor Vehicle Safety Standards) 208 (roll-over protection, published 1970) fully would be realized, outlawing both convertibles and hardtops (certainly the four-door versions).  FMVSS 208 was slated to take effect in late 1975 (when production began of passenger vehicles for the 1976 season) with FMVSS 216 (roof-crush standards) added in 1971 and applying to 1974-onwards models.  There was a “transitional” exemption for convertibles but it ran only until August 1977 (a date agreed with the industry because by then Detroit’s existing convertible lines were scheduled to have reached their EoL (end of life)) at which point the roll-over and roof-crush standards universally would be applied to passenger vehicles meaning the only way a “convertible” could registered for use on public roads was if it was some interpretation of the “targa” concept (Porsche 911, Chevrolet Corvette etc), included what was, in effect a roll-cage (Triumph Stag) or (then more speculatively), some sort of device which in the event of a roll-over would automatically be activated to afford occupants the mandated level of protection and Mercedes-Benz later would include such a device on the R129 SL roadster (1998-2001).  Although in 1988 there were not yet “pop-ups” on the internet to annoy us, quickly the press dubbed the R129’s innovative safety feature a “pop-up roll bar”, the factory called the apparatus automatischer Überrollbügel (automatic rollover bar).  It was spring loaded and pyrotechnically activated, designed fully to deploy in less than a half-second if sensors detected an impending rollover although the safety-conscious could at any time raise it by pressing one of the R129’s many buttons.

Alternative approaches (partial toplessness): 1973 Triumph Stag in Magenta (left) and 1972 Porsche 911 Targa in silver (right).  The lovely but flawed Stag (1970-1977) actually needed its built-in roll cage for structural rigidity because it's underpinnings substantially were unchanged from the Triumph 2000 sedan (1963-1977) on which it was based.

Despite the myths which grew to surround the temporary extinction of convertibles from Detroit’s production lines, at the time, the industry was at best indifferent about their demise and happily would have offered immediately to kill the breed as a trade-off for a relaxation or abandonment of other looming safety standards.  As motoring conditions changed and the cost of installing air-conditioning fell, convertible sales had since the mid-1960s been in decline and the availability of the style had been pruned from many lines.  Because of the additional engineering required (strengthening the platform, elaborate folding roofs with electric motors), keeping them in the range was justifiable only if volumes were high and it was obvious to all the trend was downwards, thus the industry being sanguine about the species loss.  That attitude didn’t however extend to a number of British and European manufacturers which had since the early post-war years found the US market a place both receptive and lucrative for their roadsters and cabriolets; for some, their presence in the US was sustained only by drop-top sales.  By the 1970s, the very existence of the charming (if antiquated) MG & Triumph roadsters was predicated upon US sales.

High tech approach (prophylactic toplessness): Mercedes-Benz advertising for the R129 roadster (in the factory's Sicherheitsorange (safety orange) used for test vehicles).

The play on words uses the German wunderbar (“wonderful” and pronounced vuhn-dah-baah) with a placement and context so an English speaking audience would read the word as “wonder bar”; it made for better advertising copy than the heading: Automatischer Überrollbügel.  This was a time when the corporate tag-line “Engineered like no other car” was still a reasonable assertion.  It had been the spectre of US legislation which accounted for Mercedes-Benz not including a cabriolet when the S-Class (W116) was released in 1972, leaving the SL (R107; 1971-1989) roadster as the company’s only open car and it wasn’t until 1990 a four-seat cabriolet returned with the debut of the A124. 

Chrysler was already in the courts to attempt to have a number of the upcoming regulations (focusing on those for which compliance would be most costly, particularly barrier crash and passive safety requirements) so instead of filing their own suit, a consortium of foreign manufacturers (including British Leyland & Fiat) sought to “append themselves” to the case, lodging a petition seeking judicial review of roll-over and roof-crush standards, arguing that in their present form (ie FMVSS 208 & 216), their application unfairly would render unlawful the convertible category (on which the profitability of their US operation depended).  A federal appeals court late in 1972 agreed and referred the matter back to NHTSA for revision, ordering the agency to ensure the standard “…does not in fact serve to eliminate convertibles and sports cars from the United States new car market.”  The court’s edit was the basis for the NHTSA making convertibles permanently exempt from roll-over & roof crush regulations.  That ensured the foreign roadsters & cabriolets lived on but although the ruling would have enabled Detroit to remain in the market, it regarded the segment as one in apparently terminal decline and had no interest in allocating resources to develop new models, happily letting existing lines expire.

The “last American convertible” ceremony, Cadillac Clark Street Assembly Plant, Detroit, Michigan, 21 April 1976.

One potential “special case” may have been the Cadillac Eldorado which by 1975 was the only one of the few big US convertibles still available selling in reasonable numbers but the platform was in its final years and with no guarantee a version based on the new, smaller Eldorado (to debut in 1978) would enjoy similar success, General Motors (GM) decided it wasn’t worth the trouble but, sensing a “market opportunity”, promoted the 1976 model as the “Last American convertible”.  Sales spiked, some to buyers who purchased the things as investments, assuming in years to come they’d have a collectable and book a tidy profit on-selling to those who wanted a (no longer available) big drop-top.  Not only did GM use the phrase as a marketing hook; when the last of the 1976 run rolled off the Detroit production line on 21 April, the PR department, having recognized a photo opportunity, conducted a ceremony, complete with a “THE END OF AN ERA 1916-1976”) banner and a “LAST” Michigan license plate.  The final 200 Fleetwood Eldorado convertibles were “white on white on white”, identically finished in white with white soft-tops, white leather seat trim with red piping, white wheel covers, red carpeting & a red instrument panel; red and blue hood (bonnet) accent stripes marked the nation’s bicentennial year.

The “last American convertible” ceremony, Cadillac Clark Street Assembly Plant, Detroit, Michigan, 21 April 1976.

Of course in 1984 a convertible returned to the Cadillac catalogue so some of those who had stashed away their 1976 models under wraps in climate controlled garages weren’t best pleased and litigation ensued, a class action filed against GM alleging the use of the (now clearly incorrect) phrase “Last American Convertible” had been “deceptive or misleading” in that it induced the plaintiffs to enter a contract which they’d not otherwise have undertaken.  The suit was dismissed on the basis of there being insufficient legal grounds to support the claim, the court ruling the phrase was a “non-actionable opinion” rather than a “factual claim”, supporting GM's contention it had been a creative expression rather than a strict statement of fact and thus did not fulfil the criteria for a “deceptive advertising” violation.  Additionally, the court found there was no actual harm caused to the class of plaintiffs as they failed to show they had suffered economic loss or that the advertisement had led them to make a purchase they would not otherwise have made.  That aspect of the judgment has since been criticized with dark hints it was one of those “what’s good for General Motors is good for the country” moments but the documentary evidence did suggest GM at the time genuinely believed the statement to be true and no action was possible against the government on several grounds, including the doctrines of remoteness and unforeseeability.

Ronald Reagan (1911-2004, US president 1981-1989). in riding boots & spurs with 1938 LaSalle Series 50 Convertible Coupe (one of 819 produced that year), Warner Brothers Studios, Burbank California, 1941.  

LaSalle was the lower-priced (although marketed more as "sporty") "companion marque" to Cadillac and a survivor of GM's (Great Depression-induced) 1931 cull of brand-names, the last LaSalle produced in 1940.  Mr Regan remained fond of Cadillacs and when president was instrumental is shifting the White House's presidential fleet to them from Lincolns.  Although doubtlessly Mr Reagan had fond memories of top-down motoring in sunny California (climate change not yet making things too hot, too often for them to be enjoyed in summer) and was a champion (for better and worse) of de-regulation, it's an urban myth he lobbied to ensure convertibles weren't banned in the US.  

Following Lindsay Lohan's example: President Xi standing through a sunroof, reviewing military parade in Hongqi L5 state limousine, Beijing, 2019.

The highlight of the ceremonies marking the 70^th anniversary of the founding of the People's Republic of China (PRC) was the military parade, held in Beijing on 1 October 2019.  Claimed to be the largest military parade and mass pageant in China's 4,000-odd year history (and the last mass gathering in China prior to the outbreak in Wuhan of became the COVID-19 pandemic), the formations were reviewed by the ruling Chinese Communist Party’s (CCP) General Secretary Xi Jinping (b 1953; paramount leader of the PRC since 2012).  The assembled crowd was said without exception to be “enthusiastic and happy” and the general secretary's conspicuously well-cut Mao suit was a nice nostalgic touch.

Two generals of the Belarus army take the salute standing, in Honggi L5 Parade Convertibles, Minsk, Belarus, June 2017.

Independence Day in Belarus is celebrated annually on 3 June and there is always a significant military component.  Other than the PRC, Belarus is the only known operator of the Honqqi and the four-door convertible parade cars were apparently a "gift" (as opposed to foreign aid) from the Chinese government but the aspect of this photograph which attracted some comment was whether the hats worn by generals in Belarus were bigger than the famously imposing headwear of the army of the DPRK (Democratic People’s Republic of Korea (North Korea)); analysts of military millinery appeared to conclude the dimensions were similar.  Purists traditionally describe this style of coach-work as "four-door cabriolet" and it was "Cabriolet D" in the Daimler-Benz system but the "parade convertible" is a distinct breed and often includes features such as grab bars for those standing, microphones and loud-speakers so the “enthusiastic and happy” crowd miss not one word.   

Hongqi L5 state limousine.

The car carrying President Xi was the Hongqi L5, the state limousine of the PRC, the coachwork styling a deliberately retro homage to the Hongqi CA770, the last in the line (dating from 1958) of large cars built almost exclusively for use by the upper echelons of the CCP.  Most of the earlier cars were built on the large platforms US manufacturers used in the 1960s and were powered by a variety of US-sourced V8 engines but the L5 was wholly an indigenous product, built with both a 6.0 litre (365 cubic inch) V12 and 4.0 litre (245 cubic inch) V8 although neither configuration is intended for high-performance.  Interestingly, although Hongqi L5 have produced a version of the L5 with four-door convertible coachwork as a formal parade car and they have been used both in the PRC and in Belarus, the general secretary conducted his review in a closed vehicle with a sunroof.

US President Richard Nixon (1913-1994, US president 1969-1974) with Anwar Sadat (1918–1981; President of Egypt 1970-1981) in a 1967 Cadillac convertible, Alexandria, Egypt, June 1974.  On that day, the motorcade was 180-strong and unlike the reception his appearance in the US now induced, the Egyptian crowd really did seem genuinely enthusiastic and happy.  Within two months, in disgrace because of his part in the Watergate Affair, Nixon would resign.

The CCP didn’t comment on the choice of a car with a sunroof and it may have been made on technical grounds, the provision of a microphone array presumably easier with the roof available as a mounting point and given the motorcade travelled a higher speed than a traditional parade, it would also have provided a more stable platform for the general secretary.  It’s not thought there was any concern about security, Xi Jinping (for a variety of reasons) safer in his capital than many leaders although heads of state and government became notably more reticent about travelling in open-topped vehicles after John Kennedy (1917–1963; US president 1961-1963) was assassinated in 1963.  Some, perhaps encouraged by Richard Nixon being greeted by cheering crowds in 1974 when driven through the streets of Alexandria (a potent reminder of how things have changed) in a Cadillac convertible, persisted but after the attempt on the life of John Paul II (1920–2005; pope 1978-2005) in 1981, there’s been a trend to roofs all the way, sometimes molded in translucent materials of increasing chemical complexity to afford some protection from assassins.

Military parade marking the 70^th anniversary of the founding of the PRC, Beijing, China, 1 October 2019.  Great set-piece military parades like those conducted by the PRC and DPRK (recalling the spectacles staged by both Nazi Germany (1933-1945) and the Soviet Union (1922-1991) are now packaged for television and distribution on streaming platforms and it may be Donald Trump (b 1946; US president 2017-2021 and since 2025) was hoping the "Grand Military Parade" he scheduled in 2025 for his 79^th birthday (ostensibly to celebrate 250 years since the formation of the US Army) would display the same impressive precision in chorography.     

Covering all possibilities during the 24 hour cycle.  US advertisement (1974) for the Renault 17 Gordini Coupe Convertible, the Gordini tag adopted as a "re-brand" of the top-of-the-range R17 (1971-1979).  Gordini was a French sports car producer and tuning house, absorbed by Renault in 1968, the name from time-to-time used for high-performance variants of various Renault models.

Renault over the decades made the occasional foray into the tempting US market but all ended badly in one way or another, their products, whatever their sometimes real virtues, tending not to be suited to US driving habits and conditions.  Sunroofs had long been popular in Europe and, noting (1) what was assumed to be the demise of the convertible and (2) Lincoln's coining of "moon roof", Renault decided Americans deserved a sunroof, moonroof & starroof, all in one.  Actually, they got even more because there was also a removable, fibreglass hardtop for the winter months, Renault correctly concluding there would be little demand for a rainroof.  Physically large as it had to be, unlike a targa top, the 17's panel was intended (like other hardtops) to be stored in a garage until the warmer months.  One quirk of the R17's nomenclature was in Italy, in deference to the national heptadecaphobia, the car was sold as the R177 but the Italians showed little more interest than the Americans.

Porsche, sunroofs, weight distribution and centres of gravity 

Porsche 917K, Le Mans, 1970.

Porsche in the early 1970s enjoyed great success in sports car racing with their extraordinary 917 but greatly innovation and speed disturb the clipboard-carriers at the Fédération Internationale de l'Automobile (the FIA; the International Automobile Federation) which is international sport's dopiest regulatory body.  Inclined instinctively to ban anything interesting, the FIA outlawed the 917 in sports car racing so Porsche turned its glance to the Can-Am (Canadian-American Challenge Cup) for unlimited displacement (Group 7) sports cars, then dominated by the McLarens powered by big-displacement Chevrolet V8s.  Unable to enlarge the 917's Flat-12 to match the power of the V8s and finding their prototype Flat-16 too bulky, Porsche resorted to forced aspiration and created what came to be known as the "TurboPanzer", a 917 which in qualifying trim took to the tracks with some 1,500 horsepower (HP).  There's since been nothing quite like it and for two years it dominated the Can-Am until the first oil shock in 1973 put an end to the fun.  However, the lessons learned about turbocharging the factory would soon put to good use.

The widow-maker: 1979 Porsche 930 Turbo (RoW (rest of the world (ie Non-NA (North American) market) model) in the “so 1980s” Guards Red with “Sunroof Delete” option.

Although an RoW car, this one has been "federalized" for registration in the US including the then required sealed-beam headlights, fitted inside the "sugar-scoop" housings.  Curiously, although the term “sunroof delete option” is often applied to the relative few 930s with solid metal roofs, there was at the time no such 930 option code and, the sunroof being listed as “standard equipment” on 930s, if a customer requested one not be fitted, what the factory did was not include option 9474 (electric sunroof) on the build sheet.  Later the companion option codes 650 (Sunroof) and 652 (Delete Sunroof) became part of the list for all models.  Rare though it may be in some Porsches, for some the “sunroof delete” thing is surprisingly desirable and in the aftermarket, it's possible to purchase “sunroof delete” panels which convert a sunroof-equipped car into one with a solid metal roof.  They are bought usually by those converting road-going cars for track use, the removal of the 29 lb-odd (13 kg) assembly not only saving weight but also lowering the centre of gravity.

1977 Porsche 930 “Sunroof Coupé” in Talbot Yellow.

Introduced in 1975, the 911 Turbo (930 the internal designation) had been intended purely as a homologation exercise (al la the earlier 911 RS Carrera) so the engine could be used in competition but so popular did it prove it was added to the list as a regular production model and one has been a permanent part of the catalogue almost continuously since.  The additional power and its sometimes sudden arrival meant the early versions were famously twitchy at the limit (and such was the power those limits were easily reached if not long explored), gaining the machine the nickname “widow-maker”.  There was plenty of advice available for drivers, the most useful probably the instruction not to use the same technique when cornering as one might in a front-engined car and a caution that even if one had had a Volkswagen Beetle while a student, that experience might not be enough to prepare one for a Porsche Turbo.  When stresses are extreme, the physics mean the location of small amounts of weight become subject to a multiplier-effect and the advice was those wishing to explore a 930's limits of adhesion should get one with the rare “sunroof delete” option, the lack of the additional weight up there slightly lowering the centre of gravity.  However, even that precaution may only have delayed the inevitable and possibly made the consequences worse, one travelling a little faster before the tail-heavy beast misbehaved.

Porsche 911 Carrera S, Pacific Coast Highway in Santa Monica, Los Angeles, June 2012.

Although it seems improbable, when in 2012 Lindsay Lohan crashed a sunroof-equipped Porsche 911 Carrera, it's not impossible the unfortunate event may have been related to the slight change in the car's centre of gravity when fitted with a sunroof.  She anyway had some bad luck when driving black German cars but clearly Ms Lohan should avoid Porsches with sunroofs.

The interaction of the weight of a 911’s roof (and thus the centre of gravity) and the rearward bias of the weight distribution was not a thing of urban myth or computer simulations.  In the February 1972 edition of the US magazine Car and Driver (C&D), a comparison test was run of the three flavours of the revised 911 (911T, 911E & 911S), using one of each of the available bodies: coupé, targa & sunroof coupé, the latter with the most additional weight in the roof.  What the testers noted in the targa & sunroof-equipped 911s was a greater tendency to twitchiness in corners, something no doubt exacerbated in the sunroof coupé because the sliding panel’s electric motor was installed in the engine bay.  C&D’s conclusion was: “If handling is your goal, it's best to stick with the plain coupe.”  

The Porsche 911 E series and the Ölklappe affair

1971 Porsche 911S (note the flap for the oil filler cap behind the passenger-side door (US market model and thus left-hand drive (LHD)).  The factory confirmed this car was built in July 1971, despite many references to E series production beginning in August.

Although in C&D's 1972 comparison test there was much focus on the rearward weight bias, the three 911s supplied actually had a slightly less tail-heavy weight distribution than either that season's predecessor or successor.  Porsche in 1971 began the build of its E series update (produced between July 1971-July 1972 and generally known as the “1972 models”) of the then almost decade-old 911 and in addition to the increase in the flat-six’s displacement from 2.2 litres (134 cubic inch) to 2.3 (143) (although always referred to as the “2.4”), there were a myriad of changes, some in response to US safety & emissions legislation while others were part of normal product development.  One of latter was the placing of the hinged-flap over the oil filler cap behind the right side door, something necessitated by the dry sump oil tank having been re-located from behind the right rear wheel to in front, one of a number of design changes undertaken to shift the weight distribution forward and improve the handling of the rear-engined machine’s inherently tail-heavy configuration.  In Germany, the addition was known variously as Ölklappe, Oil Klapper or Vierte Tür (fourth door, the fuel filler flap being the third).  Weight reduction (then becoming difficult in the increasingly strict regulatory environment), especially at the rear, was also a design imperative and the early-build E series cars were fitted with an aluminum engine lid and license-plate panel although these components were soon switched to steel because of production difficulties and durability concerns.

Where the troubles began:  The fuel filler flap on the left-front fender (left) and the oil filler flap on the right-rear fender (right).  Apparently, not even the “◀ Oil” sticker in red was sufficient warning.

For the E series 911s, Porsche recommended the use of a multigrade mineral oil (SAE 20W-50 or SAE 15W-40, depending on climate) but were aware those using their vehicles in competition sometimes used a high-viscosity SAE 50 monograde.  With the car’s 10 litre (10.6 US quarts, 8.8 Imperial quarts) oil tank, the fluid’s weight would be between 8.5-9.1 kg (18.7-20.0 lb) and the physics of motion meant that the more rearward the placement of that mass, the greater the effect on the 911’s handling characteristics.  It was thus a useful contribution to what would prove a decades-long quest to tame the behaviour of what, in the early versions, was a car regarded (not wholly unfairly) as handling like “a very fast Volkswagen Beetle” and ultimately the engineers succeeded, it being only at the speeds which should be restricted to race tracks the 911s of the 2020s sometimes reveal the implications of being rear-engined.

VDO instruments in 1971 Porsche 911S.  In home market cars, the oil pressure gauge (to the left of the centrally mounted tachometer) was labelled DRUCK.

However, when in August 1972 the revised F series entered production, the oil tank was back behind the rear wheel and the filler under the engine lid, the retrogressive move taken because there had been instances of gas (petrol) station attendants (they really used to exist) assuming the oil filler flap was the access point for the gas cap and, to be fair, it was in a location used for gas on many front-engined cars (a majority of the passenger-car fleet in most markets where Porsche had a presence).  Quite how often this happened isn’t known but it must have been frequent enough for the story to become part of the 911 legend and the consequences could have been severe and rectification expensive.  The factory paid much attention to oil and also ensured drivers could monitor the status of the critical fluid; all air-cooled 911s ran hot and the more highly tuned the model (in 1971-1972 the 911T, E & S in increasing potency), the hotter they got.  As well as being a lubricant, engine oil functions also as a coolant and the VDO instrumentation included gauges for oil level, oil temperature, and oil pressure; for all three to appear in a road car was unusual but being air-cooled and thus with no conventional fluid coolant, the oil's dynamics were most important.