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Slipper clutches - coil or diaphragm?

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In a previous RET-Monitor article we looked at how these 'Back Torque Limiters' or 'Slipper Clutch' units operate, and their particular advantages in motorcycle applications. They allow a controlled slipping of the clutch until the speeds of both the rear wheel and the engine are matched, and have found their way into many motorcycle race formulae including World and British Superbike, Supermoto and even Motocross. While not exclusively suited to motorcycle applications,...

High-speed raceboat propeller design

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Although attaining speeds up to and in excess of 100 mph on tarmac is not an arduous task, it is a rather more multi-faceted undertaking on water. One of the many considerations of high-speed marine applications is transmission and propeller design. There are a number of high-speed marine formulae that use various propulsion systems, including water-jet drives, super-cavitating and surface-piercing propeller drives. The Oulton Broads and surrounding areas, in Suffolk, England, have...

More on bike-engined cars

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In the previous article on this subject, I looked at a reversing differential for a bike-engined car where the engine is mounted longitudinally. Many bike-engined cars are configured with the engine mounted transversely, as it is in the motorcycle from which it is taken. This arrangement is commonly seen in Formula Student, for example. One particularly enterprising car constructor has developed, and very successfully used, its own gear-drive conversion in place of the existing chain...

Motorcycle-engined cars

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While most press coverage of motorsport tends to look at big-budget motor racing, there are interesting technical features on many of the lower-budget machines that pound around the circuits during the summer weekends. There are a number of race series where lightweight cars powered by motorcycle engines are popular and successful. In the UK, Radical in particular has made a very successful business out of building bike-engined sportscars, and its V8 car has an engine based on two...

Formula One CVT (Part 2)

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In the previous article, we looked at the prototype Formula One constantly variable transmission (CVT) system that Williams developed in conjunction with Van Doorn in the early 1990s, and spoke to engineer Arnaud Boulanger who was involved with the project. Anyone who follows Formula One closely will remember the dominant position that Williams had at that time. The CVT's development happened during a golden era for Williams; having the best car, they attracted the best drivers and for...
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