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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Gearbox woes
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<blockquote data-quote="hadronuk" data-source="post: 56687" data-attributes="member: 1866"><p>Eddy asked if I add some numbers. It’s a while since I looked at this, but for what it’s worth….</p><p></p><p>With the original Vincent damper fitted, the top link can move through 53 degrees, and the bottom damper through 55 degrees.</p><p>I gave up on extending my model further to calculate all the forces, but the forces in the links at full full compression, solely as a result of the springs pushing forward (@42 degrees) must be somewhere near 1000 lbs tension for the bottom link and 600 lb compressive for the top link.</p><p>Obviously, braking forces act on the links in the opposite direction.</p><p>I got as far as working out that to stop from 30mph in 29 ft is 1.037 g. (I think many road tests were around this.)</p><p>Plucking some figures from the air:</p><p>Assuming an all up weight of 620 lbs, and that the front brake is doing 60% of the braking, the force at the tyre contact patch comes out 386 lb, and this has a lot of leverage beacause of its distance from the links.</p><p>Ted Davis writes that under instruction from Phil Vincent he did tests with a Comet equipped with a system that sprayed paint onto the road when the brakes were applied.</p><p>He achieved a best stopping distance of 21 feet, which requires 1.43g.</p><p>That seems quite extraordinary to me.</p></blockquote><p></p>
[QUOTE="hadronuk, post: 56687, member: 1866"] Eddy asked if I add some numbers. It’s a while since I looked at this, but for what it’s worth…. With the original Vincent damper fitted, the top link can move through 53 degrees, and the bottom damper through 55 degrees. I gave up on extending my model further to calculate all the forces, but the forces in the links at full full compression, solely as a result of the springs pushing forward (@42 degrees) must be somewhere near 1000 lbs tension for the bottom link and 600 lb compressive for the top link. Obviously, braking forces act on the links in the opposite direction. I got as far as working out that to stop from 30mph in 29 ft is 1.037 g. (I think many road tests were around this.) Plucking some figures from the air: Assuming an all up weight of 620 lbs, and that the front brake is doing 60% of the braking, the force at the tyre contact patch comes out 386 lb, and this has a lot of leverage beacause of its distance from the links. Ted Davis writes that under instruction from Phil Vincent he did tests with a Comet equipped with a system that sprayed paint onto the road when the brakes were applied. He achieved a best stopping distance of 21 feet, which requires 1.43g. That seems quite extraordinary to me. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Gearbox woes
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