The motorcycle land speed record: the quest for the fastest flying kilometre

RaceAck Attack1948

From the beaches of Ormond Beach to the salt flats of Utah, the quest for the fastest flying kilometre tells a century of engineering and daring. The rule of two runs in opposite directions was born with it. Ernst Henne streamlined his BMW, Rollie Free stretched out in swimming trunks on a Vincent in 1948, then the American streamliners took over, from Don Vesco to Dave Campos. The duel between the Ack Attack and the BUB Seven ended on the average of 605.697 km/h set by Rocky Robinson in 2010, still unbeaten.

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The two-run rule: why an average

The outright motorcycle speed record never rewards an isolated peak. It crowns an average calculated over a timed distance, generally the flying kilometre or the flying mile, that is a measured stretch the machine enters already at full speed, after several kilometres of run-up. What happens before and after the timing traps does not enter the calculation.

The decisive constraint fits in one sentence: you have to come back the other way. The regulations of the Fédération Internationale de Motocyclisme require two runs made in opposite directions over the same distance, the whole to be completed within two hours. American national records follow a similar logic, with a there-and-back on the same day.

The rule is no administrative nicety. On a course several kilometres long, a moderate tailwind or an almost imperceptible slope is enough to inflate a speed by several tens of kilometres per hour. By forcing the team to make the run again in the other direction, then taking the average of the two, the regulation mechanically cancels out the advantage of terrain and wind.

The gap between the two figures can be spectacular. In 2010, the Top 1 Oil-Ack Attack streamliner was clocked at 634.2 km/h on its fastest run, but it is the average of 605.697 km/h that went into the record books. A rider who announces a peak without giving an average therefore holds, in regulatory terms, no record at all.

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The pioneers: beaches, roads and approximate stopwatches

On 24 January 1907, on the hard sand of Ormond Beach in Florida, the American Glenn Curtiss launched a machine of his own making fitted with a V8 aircraft engine and was credited with around 219 km/h. The figure long circulated as that of « the fastest man in the world », but it was never ratified : timing was by hand, and the drive shaft failed before the return run could be made. The example alone illustrates the usefulness of the double run.

It took until 14 April 1920 for a record to be officially recognised: on that day, at Daytona Beach, Gene Walker took the mark to 166.6 km/h on an Indian. The discipline took shape, and American beaches and long European straights became manufacturers' favourite playgrounds.

The 1920s belonged to the British. Nicknamed the wizard of Brooklands, Herbert « Bert » le Vack made attempt after attempt on the Arpajon straight in France and set an average of 191.5 km/h in 1924 aboard a JAP-engined machine. He piled up nine world records in 1924 alone. The marque he flew the flag for is also the one that embodied English mechanical luxury at the time, and whose story we tell in our portrait of the Brough Superior SS100. Pure speed became a commercial argument as much as a sporting achievement.

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The age of the fairing: Henne, Taruffi and Herz

From 1929, one name dominated the discipline without ever monopolising it: Ernst Henne. The Bavarian rider started with 216.6 km/h on a supercharged 750, then strung together records for eight years for a claimed total of seventy-six world marks. Between two of his attempts, the record regularly passed back to the JAP-engined British, from Joseph Wright in 1930 to Eric Fernihough, who still held it in the spring of 1937 at 273.1 km/h. His machines tell in fast-forward the story of aerodynamics applied to motorcycles, a subject running through the history of BMW Motorrad.

The Italian riposte came on 21 October 1937: on a supercharged four-cylinder Gilera faired in a wind tunnel, Piero Taruffi took the mark back from Fernihough with an average of 274.2 km/h. The German answer landed five weeks later. On 28 November 1937, Henne lined up a fully faired supercharged 500, a shell shaped like a shell on two wheels, and took the record to 279.5 km/h.

The war froze the discipline, and that 1937 figure would stand for fourteen years. It took until 12 April 1951 for another German, Wilhelm Herz, to beat it at 290 km/h on a supercharged NSU, launched this time on the motorway linking Munich to Ingolstadt.

Herz above all marked the geographical shift of the discipline. In August 1956, he took his NSU Delphin III, a blue enclosed shell driven by a supercharged half-litre twin, to the salt flats of Utah, and recorded an average of 339 km/h there. He became the first motorcyclist past 200 miles per hour, and America settled durably at the centre of the game.

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1948: Rollie Free, swimming trunks and a Vincent

Eight years earlier, an episode of an entirely different kind had already made its mark. The American patron John Edgar wanted to take the United States national record back from Harley-Davidson, held since 13 March 1937 by Joe Petrali at 219.2 km/h on Daytona beach. The aim was therefore not the outright world record, then still Ernst Henne's property, but the American mark.

The machine chosen was a Vincent HRD prepared by the English factory, which most historians identify as the very first example of the Black Lightning, the racing version of the road bike we detailed in our article on the Vincent Black Shadow. Everything not strictly necessary had been removed : lighting, mudguards, silencers, stands.

On 13 September 1948, on the Utah salt flats, rider Roland « Rollie » Free made a first attempt in leathers, which tore under the pressure of the wind according to the most widespread account. He set off again wearing nothing but swimming trunks, a borrowed pair of plimsolls and a bathing cap, stretched full length on the machine, legs extended behind him. The average of the two runs came to 241.9 km/h, that is 150.313 miles per hour, and the American record changed hands.

The gesture bordered on recklessness: a fall on the salt crust, abrasive as sandpaper, would have left no chance. It nevertheless produced one of the most reproduced photographs in motorcycling. The shot, taken from a vehicle following the bike, holds entirely in one contrast: an almost naked man, stretched out on a black machine, skimming across a white desert.

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The American streamliners: Vesco, Rayborn, Campos

The 1950s and 1960s saw the rise of the format that still dominates today: the enclosed shell, long and narrow, inside which the rider is shut in lying down. On 6 September 1956, Johnny Allen passed 345 km/h in a machine nicknamed the Texas Ceegar, driven by a Triumph twin. The FIM refused to ratify the performance on a regulatory point, but the English factory drew from it a name destined for posterity, the one still carried by the Triumph Bonneville T120.

Progress then became steady. On 5 September 1962, Bill Johnson took the record to 361.4 km/h, still with Triumph machinery. In 1966, Bob Leppan passed the 395 km/h mark with the Gyronaut X-1, a slender spindle that prefigures today's machines.

Then came Don Vesco, a central figure in the discipline. In 1970, he was the first past 250 miles per hour with an average of 405 km/h on a Yamaha-engined machine. The same year, Cal Rayborn answered at 427.3 km/h on a Harley-Davidson streamliner, in a rivalry that set two manufacturers against each other as much as two riders.

On 28 September 1975, Vesco set the bar at 487.5 km/h with the Silver Bird, driven by two Yamaha TZ750 engines: the first pass beyond 300 miles per hour. Three years later, on 28 August 1978, he turned the machine into the Lightning Bolt, fitted it with two turbocharged thousand-cubic-centimetre Kawasakis and set 512.7 km/h. That record would stand for twelve years.

On 14 July 1990, Dave Campos succeeded him aboard the Easyriders, a seven-metre spindle driven by two Harley-Davidson-derived V-twins, with an average of 518.5 km/h. Funded by the readers of an American magazine rather than by a major manufacturer, this hand-built machine would hold the record for sixteen years.

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The modern duel: Ack Attack against BUB Seven

The discipline woke up in 2006, for a simple reason: two independent teams arrived at the same moment with fully developed machines. On one side, engineer Mike Akatiff fielded the Ack Attack, a six-metre streamliner driven by two turbocharged Suzuki Hayabusa engines, around 2,600 cc for over a thousand horsepower, whose lineage with the production Suzuki Hayabusais plain to see.

On the other, Denis Manning, a salt veteran, entered the BUB Seven and its 2,997 cc turbo V4 making around five hundred horsepower, designed specifically for the exercise. The two teams answered each other two days apart : Rocky Robinson took the record on 3 September 2006, Chris Carr took it back on the 5th.

The demonstration had a price. In 2007, Robinson lost control of the Ack Attack beyond 320 miles per hour; the machine rolled sixteen times before coming to rest, and the rider walked away. The machine was rebuilt and the team came back.

On 26 September 2008, Robinson took the mark to 580.8 km/h. On 24 September 2009, Carr replied at 591.2 km/h: a former seven-time AMA Grand National champion, he came from a discipline at the opposite pole from the flying kilometre, the one we cover in our article on American flat track. The record changed hands five times between 2006 and 2010.

The denouement came on 25 September 2010, at a session organised on the Utah salt flats. Robinson completed his two regulation runs and obtained a ratified average of 605.697 km/h, with an outward run clocked at 634.2 km/h. That is the figure still listed today in the FIM register and in the Guinness World Records.

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Ground that wears out: the fragility of the salt desert

The quest for the flying kilometre depends on a resource nobody manufactures: a flat, hard surface several kilometres long. The great salt flats of Utah have met that specification since the 1930s, but the salt crust is thinning. Where the US Geological Survey recorded more than two metres at the thickest point in 1960, then one metre seventy in 1988, measurements in the 2010s were counted in tens of centimetres, and in places in centimetres.

The consequence is direct for records: the international course, which once approached twenty kilometres, has shrunk. Yet a streamliner weighing more than 700 kilos needs length to build up speed before the timed section, then to slow down afterwards using its parachutes. Shortening the course means capping the attainable speed.

Cancellations have indeed multiplied: the site's big speed week could be held neither in 2014 nor in 2015, for want of a usable surface after rain. In 2025, during the motorcycle speed trials, the international course was closed intermittently because of standing water, to the point of losing the final day entirely, and the BUB Seven could not have its chance.

The result is a paradox few disciplines know. Technical means have never been so available, projects to go back beyond 400 miles per hour exist, but the weather window and the quality of the salt govern everything. More than fifteen years on, the 2010 average still stands, and every passing season adds to its legend.

🏁 These silhouettes of spindles launched across the salt suit a wall better than a garage: discover our selection of motorcycle posters and prints.

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Summary table

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FAQ — Frequently asked questions

• What is the current motorcycle speed record?
  On 25 September 2010, on the Utah salt flats, Rocky Robinson took the outright record to an average of 605.697 km/h aboard the Top 1 Oil-Ack Attack streamliner. That FIM-ratified mark had still not been beaten when this article was written.
• Why must two runs be made in opposite directions?
  Because a single run would reward a tailwind and a slope. The rules therefore require an outward and a return run over the same timed distance, and the speed taken is the average of the two. The FIM requires those two runs to be completed within two hours.
• Did Rollie Free break the world record in swimming trunks?
  No. On 13 September 1948, his average of 241.9 km/h earned him the American national record, taken back from Joe Petrali and Harley-Davidson. The outright world record was then still the property of Ernst Henne and BMW, at 279.5 km/h since 1937.
• What is a streamliner?
  It is a fully faired record motorcycle, inside which the rider lies enclosed. The machine runs on two wheels in line, supplemented by outriggers used at the start and the finish, and slows using parachutes. The Ack Attack is around six metres long and weighs more than 700 kilos.
• Can a production motorcycle come close to this record?
  No. The fastest sports bikes on sale are deliberately limited to around 300 km/h following an agreement between manufacturers reached in the late 1990s. An outright record is set at more than double that, with an enclosed shell, several hundred horsepower and a course several kilometres long.

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