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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Centre of flywheels and lateral centre of weight for a twin engine.
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<blockquote data-quote="timetraveller" data-source="post: 19638" data-attributes="member: 456"><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">I doubt that it is as simple as that. The only time that I had a tank slapper (while racing at Cadwell at about 100 mph) there was no way that the gyroscopic effect of the front wheel did me any good at all. Instead it went from lock to lock, faster than one could see clearly, with the kinetic energy of bike plus rider; say about 600 – 650 lbs at 100 mph being fed into the whole of the front end. The curved black skid marks on the track were about 3’ long with paired marks curved left and right at about 10 foot intervals. It is a long time ago but if I am remembering those figures correctly then, letting 100 mph be about 140 feet /second, means that the total cycle of left, right left again was occurring about 14 times per second. So much energy is fed into the front end as the forks hit the stops with the whole force of the bike behind the impact that the front wheel gyroscope doesn’t stand a chance. On a lesser bike the stops would have been fractured. It can be instructive to play with a gyroscope and see how it actually twists when a torque is applied to the axel. It does not do what one would naively expect. My scars are still visible in a bright light!</span></span></p></blockquote><p></p>
[QUOTE="timetraveller, post: 19638, member: 456"] [FONT=Times New Roman][SIZE=3]I doubt that it is as simple as that. The only time that I had a tank slapper (while racing at Cadwell at about 100 mph) there was no way that the gyroscopic effect of the front wheel did me any good at all. Instead it went from lock to lock, faster than one could see clearly, with the kinetic energy of bike plus rider; say about 600 – 650 lbs at 100 mph being fed into the whole of the front end. The curved black skid marks on the track were about 3’ long with paired marks curved left and right at about 10 foot intervals. It is a long time ago but if I am remembering those figures correctly then, letting 100 mph be about 140 feet /second, means that the total cycle of left, right left again was occurring about 14 times per second. So much energy is fed into the front end as the forks hit the stops with the whole force of the bike behind the impact that the front wheel gyroscope doesn’t stand a chance. On a lesser bike the stops would have been fractured. It can be instructive to play with a gyroscope and see how it actually twists when a torque is applied to the axel. It does not do what one would naively expect. My scars are still visible in a bright light![/SIZE][/FONT] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Centre of flywheels and lateral centre of weight for a twin engine.
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