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Dirt Bike Mods & Maintenance
Understanding....rebound
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[QUOTE="will pattison, post: 24554, member: 19283"] well...alrighty then. this is what i call a stimulating discussion. it seems as if the question has been answered by a good experiment. one of my favorite engineering maxims is this: "one test is better than 1000 expert opinions." however, let me shed some more light, since, as spanky250 asked, i are an engunieer. masters degree in mechanical engineering, for whatever credibility that's worth. (i was actually a terrible student, i just hung around a few more years so i could keep drinking beer!) spanky is partially right in saying that the force is applied to the swingarm at the axle. however, it has to get there via the sprocket and hub. at any given moment, it's totally valid to consider the combination of swingarm and wheel as a rigid body- an "l" shaped one that is attached to the frame via the chain. it is also true that in analyzing the problem, one should break down the force vector extending from the top of the "l" to the frame (countershaft sprocket) into it's horizontal and vertical components. further, it's true that- at least when the swingarm is either centered with respect to the countershaft or above it- that the vertical component points at the ground. however, since we cannot consider the joint between the swingarm and the frame to be rigid, and the horizontal component pointing toward the frame is much larger than the downward vertical one, the swingarm has to rotate counterclockwise. in other words, where you ultimately end up with all these force vectors is at a counterclockwise moment about the swingarm pivot. to be fair, though, i don't know that chain torque is the most important factor in squat. weight shift certainly cannot be denied. i also think that, especially in the jump landing case, that what it does more than create squat is to counteract rebound, thereby creating a stiffening "effect". jer? wp. [/QUOTE]
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MX, SX & Off-Road Discussions
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Understanding....rebound
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