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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Speet Brake Installation Query
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<blockquote data-quote="davidd" data-source="post: 110598" data-attributes="member: 1177"><p>Gary,</p><p></p><p>Your figures seem incorrect to me, but I fully admit that I have had trouble with this approach before. If I summarize what I believe the argument has been it is that the twin cables split the force generated at the hand lever. Thus, 10 lbs. at the lever turns into 5 lbs. (per cable) at the end of each brake arm. The Vincent balance beam is different: 10 lbs. of force on the hand lever yields 10 lbs. of force on the inner cable (on the primary side) and 10 lbs. of force on the primary side of the balance beam from the sheath or outer cover. That force is in turn pulling up 10 lbs. on the timing side of the balance beam (and the attached brake arm), meaning the the 10 lbs. of pull is generating a total of 20 lbs. of pull at end of both brake arms...double the pull of the twin cable system (ignoring for the moment the different distances travelled.)</p><p></p><p>To simplify even further, I think the argument has been that the Vincent system has no stationary brake anchors where the hand lever force is lost to the frame. The Vincent has a moving brake anchor (the brake anchor is the primary side of the balance beam), that utilizes the force lost with the frame brake anchor by transferring it to the timing side brake arm. The balance beam acts as a moving brake anchor transferring the force lost by the frame brake anchors to the timing side brake arm.</p><p></p><p>I have not seen any simple explanation of the physics of the differences of these two systems and why they yield such different results. It is most likely my lack of schooling in this area, but I would be interested in know how the physics work.</p><p></p><p>I don't know in which MPH Tom's article appears, but I remember reading it. I posted the Higgins articles here.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 110598, member: 1177"] Gary, Your figures seem incorrect to me, but I fully admit that I have had trouble with this approach before. If I summarize what I believe the argument has been it is that the twin cables split the force generated at the hand lever. Thus, 10 lbs. at the lever turns into 5 lbs. (per cable) at the end of each brake arm. The Vincent balance beam is different: 10 lbs. of force on the hand lever yields 10 lbs. of force on the inner cable (on the primary side) and 10 lbs. of force on the primary side of the balance beam from the sheath or outer cover. That force is in turn pulling up 10 lbs. on the timing side of the balance beam (and the attached brake arm), meaning the the 10 lbs. of pull is generating a total of 20 lbs. of pull at end of both brake arms...double the pull of the twin cable system (ignoring for the moment the different distances travelled.) To simplify even further, I think the argument has been that the Vincent system has no stationary brake anchors where the hand lever force is lost to the frame. The Vincent has a moving brake anchor (the brake anchor is the primary side of the balance beam), that utilizes the force lost with the frame brake anchor by transferring it to the timing side brake arm. The balance beam acts as a moving brake anchor transferring the force lost by the frame brake anchors to the timing side brake arm. I have not seen any simple explanation of the physics of the differences of these two systems and why they yield such different results. It is most likely my lack of schooling in this area, but I would be interested in know how the physics work. I don't know in which MPH Tom's article appears, but I remember reading it. I posted the Higgins articles here. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Speet Brake Installation Query
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