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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Mongrel
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<blockquote data-quote="davidd" data-source="post: 107016" data-attributes="member: 1177"><p>As Tim says, the Newby can be very light. I would tighten the springs for land speed runs and loosen them for road racing.</p><p></p><p>Using the brakes as an example, the amount of force you can generate is a result of the leverage on the lever, which is about 400 lbs (based upon where it is grabbed and the 100 lbs you apply.) That 400 lbs is divided by the distance of the pivot to the cable end in the lever (center to center.) Because that pivot distance in in the denominator, it really changes the cable force dramatically. For example, if the pivot distance is 1" it is easy to see that all 400 lbs is transmitted. If it more like the Vincent, you have 7/8" in the denominator (making it smaller), it would make the force much higher than 400 lbs. If you used a pivot distance of 1-1/8", the denominator is much bigger and the resulting force is much lower.</p><p></p><p>The reason Vincent could get away with such short brake arms on the brake plates is that they used a small pivot distance in the lever, which created more force. The larger pivot distances tend to use much longer brake arms, which technically could have provided similar forces.</p><p></p><p>The Vincent brake system, it uses a short pivot distance to create a high force, short travel brake. The other systems use a longer pivot distance to create a low force, long throw brake. The systems should achieve similar results, all other things being equal. However, mixing the two necessitates a lot of experimentation to get to a useful compromise.</p><p></p><p>[ATTACH=full]26970[/ATTACH]</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 107016, member: 1177"] As Tim says, the Newby can be very light. I would tighten the springs for land speed runs and loosen them for road racing. Using the brakes as an example, the amount of force you can generate is a result of the leverage on the lever, which is about 400 lbs (based upon where it is grabbed and the 100 lbs you apply.) That 400 lbs is divided by the distance of the pivot to the cable end in the lever (center to center.) Because that pivot distance in in the denominator, it really changes the cable force dramatically. For example, if the pivot distance is 1" it is easy to see that all 400 lbs is transmitted. If it more like the Vincent, you have 7/8" in the denominator (making it smaller), it would make the force much higher than 400 lbs. If you used a pivot distance of 1-1/8", the denominator is much bigger and the resulting force is much lower. The reason Vincent could get away with such short brake arms on the brake plates is that they used a small pivot distance in the lever, which created more force. The larger pivot distances tend to use much longer brake arms, which technically could have provided similar forces. The Vincent brake system, it uses a short pivot distance to create a high force, short travel brake. The other systems use a longer pivot distance to create a low force, long throw brake. The systems should achieve similar results, all other things being equal. However, mixing the two necessitates a lot of experimentation to get to a useful compromise. [ATTACH type="full"]26970[/ATTACH] David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Mongrel
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