Silver Bullet | |
---|---|
Overview | |
Manufacturer | Sunbeam of Wolverhampton |
Production | one-off (1929) |
Body and chassis | |
Body style | Land speed record car |
Powertrain | |
Engine | Two Sunbeam 2,000hp supercharged V12 engines, totalling 48 litres [1] |
The Sunbeam Silver Bullet was a world land speed record challenging automobile built by Sunbeam of Wolverhampton for Kaye Don in 1929.
Powered by two supercharged engines of 24 litres each, it looked impressive but failed to achieve any records, [2] [3] and was the manufacturer’s last attempt at the record.
Sunbeam's 1927 200 mph The record won in 1927 with the Sunbeam 1000HP had been broken by 1929, and the company decided to build a car capable of reaching 250 mph (400 km/h) to recover it. Only aero engines offered enough power to do so, and such a car would also provide a test bed for developing a new generation of aero-engines.
Sunbeam decided to develop a new aero engine of 2,000 hp (1,500 kW), and the car would be powered by two of them.
This new engine was a water-cooled V-12 with a 50° angle between the banks. Ideal balance usually favours an angle of 60°, but this choice made the engine narrower overall. Cylinder bore was 140 mm (5.5 in) and stroke was 130 mm (5.1 in), for a capacity of 24.02 litres. [4] This oversquare geometry was a first for Sunbeam, but encouraged a high-revving and thus more powerful engine.
The engines were supercharged, using a large centrifugal blower, geared to 17,000 rpm. This was increasingly common aero engine practice of the time, in both the Napier Lion and the Rolls-Royce R-type, but again was a first for Sunbeam.
When installed in the record-attempt car the engines had an unusual cooling system using melting ice rather than a radiator. This avoided the drag of an open radiator, but obviously could only cool for as long as the ice lasted. It was a workable system for land speed records, used by the contemporary Golden Arrow and more recently by the JCB Dieselmax. Silver Bullet had an 11.5-cubic-foot (0.33 m3) ice tank, filled with 5.5 hundredweight (about 280 kilograms) of ice before each run, and a one-gallon mixing tank in the nose. [4]
Photographs of the car are rare, although there are some at the Brooklands photo archive. These show it outside Delaney & Sons. garage, a popular location for racing in this era. [5] Some also show close-ups, including the innovative rear aerofoil that could be adjusted to generate downforce. [6] [7] [8]
Rare Movietone News footage on YouTube shows the car outside the Sunbeam factory in Wolverhampton, England with a crowd of Sunbeam workers. Kaye Don arrives driving the Sunbeam V12 racing and land speed record car "Sunbeam Tiger". He is met by Louis Coatalen, Sunbeam's Managing Director and Chief Engineer who describes the effort to make the car. Don describes the planned attempt on the Land Speed Record at Daytona Beach on Florida
Competition for the land speed record between Segrave's Golden Arrow and Malcolm Campbell's new Blue Bird was fierce, so the car was built quickly, working around the clock in shifts. This left little time for thorough static testing of the engines, made even worse as only two engines were ever built and so the only engines available for testing were the race engines themselves. Silver Bullet first appeared in public on 21 February 1930.
Following the other teams, the first record attempt was to be made on Daytona Beach, in Florida, with Kaye Don driving. The car arrived at Daytona on 8 March and Louis Coatalen himself on 16th. The record attempts went poorly though, with engine reliability problems and the car proving difficult to control. The fastest speed attained was 186 mph (299 km/h), well below Sunbeam's own record of three years earlier.
After the team returned home, further attempts were made to improve the car with testing on Pendine Sands. [9] [10] [11]
Sunbeam aircraft engines had never recovered from the financial effects of the end of the Great War. [12] Coupled with the Depression of the 1930s, Sunbeam simply could not afford a competition program of this scale. Although other UK car companies even did well in this period, Sunbeam did not and went into receivership in 1935.
The Silver Bullet was sold to Jack Field, a Southport hotelier and garage owner. He tested the car on Southport beach, scene of Segrave's earlier success with the Sunbeam Tiger, but couldn't solve its problems and eventually the car was scrapped. [13]
In 1996 a redevelopment of the former works site of Star cars, in St. John's, Wolverhampton into a new Retail Park saw a themed set of public art features referencing the Sunbeam Land speed record attempts. A bronze relief panel tribute to the Silver Bullet car was depicted in a bas relief, attempting the speed record with reference to Kaye Don as the driver. The whole series of artworks around the Retail site were a design collaboration of artist Steve Field and the sculptor John McKenna A.R.B.S and rendered in 1930's Art Deco manner. They showed other Sunbeam Record attempts and reference the historical industrial car making heritage of Wolverhampton.
Sunbeam Motor Car Company Limited was a British automobile manufacturer in operation between 1905 and 1934. Its works were at Moorfields in Blakenhall, a suburb of Wolverhampton in Staffordshire, now West Midlands. The Sunbeam name had originally been registered by John Marston in 1888 for his bicycle manufacturing business. Sunbeam motor car manufacture began in 1901. The motor business was sold to a newly incorporated Sunbeam Motor Car Company Limited in 1905 to separate it from Marston's pedal bicycle business; Sunbeam motorcycles were not made until 1912.
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The Sunbeam 350HP is an aero-engined car built by the Sunbeam company in 1920, the first of several land speed record-breaking cars with aircraft engines.
Sir Henry O'Neal de Hane Segrave was an early British pioneer in land speed and water speed records. Segrave, who set three land and one water record, was the first person to hold both titles simultaneously and the first person to travel at over 200 miles per hour (320 km/h) in a land vehicle. He died in an accident in 1930 shortly after setting a new world water speed record on Windermere in the Lake District, England. The Segrave Trophy was established to commemorate his life.
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Sunbeam, Wolverhampton, England, started to build aircraft engines in 1912. Louis Coatalen joined Sunbeam as chief engineer in 1909, having previously been Chief Engineer at the Humber company works in Coventry. The company quickly became one of the UK's leading engine manufacturers and even designed an aircraft of its own. Sunbeam discontinued the production of aircraft engines after Coatalen left the company in the 1930s.
Julien Jean Chassagne was a pioneer submariner, aviator, and French racing driver active 1906-1930. Chassagne finished third in the 1913 French Grand Prix; won the 1922 Tourist Trophy and finished second in the 1925 Le Mans Grand Prix d'Endurance - all in Sunbeam motorcars. He was second in the 1921 Italian Grand Prix with a Ballot, and set speed records and won races at Brooklands and hill climbs internationally.
Louis Hervé Coatalen was an automobile engineer and racing driver born in Brittany who spent much of his adult life in Britain and took British nationality. He was a pioneer of the design and development of internal combustion engines for cars and aircraft.
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Kenelm Edward Lee Guinness MBE was an Irish racing driver of the 1910s and 1920s mostly associated with Sunbeam racing cars. He set a new Land Speed Record in 1922. Also an automotive engineer, he invented and manufactured the KLG spark plug. Additionally, aside from motorsport and mechanical interests, he was a director of the Guinness brewing company.
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The 1921 S.T.D. 'Works' Grand Prix chassis was built to the three-litre and minimum weight of 800 kilogrammes formula for that year's Indianapolis 500 and French Grand Prix de l’A.C.F. These team cars were modified by the Sunbeam Experimental department in Wolverhampton for the 1922 Isle of Man Tourist Trophy, which was won by one of the cars. A few months later, and with 1916 4.9-litre engines, two of the T.T. cars competed in the Coppa Florio, Sicily and gained second and fourth position.
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