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#31
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Cyclist on Hill:0, Wall:1
On Sat, 27 Apr 2019 00:47:53 +0100
TMS320 wrote: On 26/04/2019 15:05, Rob Morley wrote: Usually just bracing your knees against the top tube tends to dampen speed wobble, braking can make it worse. Not necessarily. Do anything that takes energy out of the system. Not anything, because one of the ways to take energy out of the system is to pile into a hedge. OTOH just changing the resonant frequency of interacting parts of the system, by shifting your riding position, may be sufficient to regain control. I once got into a massive tank slapper when I hit an iron cover in a fast curve, but I managed to avoid the oncoming petrol tanker. Could have been a very different outcome. Well, that's my original point. Sorry, what? |
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#32
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Cyclist on Hill:0, Wall:1
On 27/04/2019 02:17, Rob Morley wrote:
On Sat, 27 Apr 2019 00:47:53 +0100 TMS320 wrote: On 26/04/2019 15:05, Rob Morley wrote: Usually just bracing your knees against the top tube tends to dampen speed wobble, braking can make it worse. Not necessarily. Do anything that takes energy out of the system. Not anything, because one of the ways to take energy out of the system is to pile into a hedge. OTOH just changing the resonant frequency of interacting parts of the system, by shifting your riding position, may be sufficient to regain control. I once got into a massive tank slapper when I hit an iron cover in a fast curve, but I managed to avoid the oncoming petrol tanker. Could have been a very different outcome. Well, that's my original point. Sorry, what? Seconded, chairman. |
#33
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Cyclist on Hill:0, Wall:1
On 27/04/2019 02:17, Rob Morley wrote:
On Sat, 27 Apr 2019 00:47:53 +0100 TMS320 wrote: On 26/04/2019 15:05, Rob Morley wrote: Usually just bracing your knees against the top tube tends to dampen speed wobble, braking can make it worse. Not necessarily. Do anything that takes energy out of the system. Not anything, because one of the ways to take energy out of the system is to pile into a hedge. OTOH just changing the resonant frequency of interacting parts of the system, by shifting your riding position, may be sufficient to regain control. I once got into a massive tank slapper when I hit an iron cover in a fast curve, but I managed to avoid the oncoming petrol tanker. Could have been a very different outcome. Well, that's my original point. Sorry, what? Shimmies are not pleasant experiences |
#34
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Cyclist on Hill:0, Wall:1
On 27/04/2019 10:58, TMS320 wrote:
On 27/04/2019 02:17, Rob Morley wrote: On Sat, 27 Apr 2019 00:47:53 +0100 TMS320 wrote: On 26/04/2019 15:05, Rob Morley wrote: Usually just bracing your knees against the top tube tends to dampen speed wobble, braking can make it worse. Not necessarily. Do anything that takes energy out of the system. Not anything, because one of the ways to take energy out of the system is to pile into a hedge.Â* OTOH just changing the resonant frequency of interacting parts of the system, by shifting your riding position, may be sufficient to regain control. I once got into a massive tank slapper when I hit an iron cover in a fast curve, but I managed to avoid the oncoming petrol tanker.Â* Could have been a very different outcome. Well, that's my original point. Sorry, what? Shimmies are not pleasant experiences You should be more careful with your snipping. You woke Noddy up. |
#35
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Cyclist on Hill:0, Wall:1
On 27/04/2019 02:17, Rob Morley wrote:
On Sat, 27 Apr 2019 00:47:53 +0100 TMS320 wrote: On 26/04/2019 15:05, Rob Morley wrote: Usually just bracing your knees against the top tube tends to dampen speed wobble, braking can make it worse. Not necessarily. Do anything that takes energy out of the system. Not anything, because one of the ways to take energy out of the system is to pile into a hedge. OTOH just changing the resonant frequency of interacting parts of the system, by shifting your riding position, may be sufficient to regain control. Difficult to do anything about resonant frequency. If it was possible, the oscillation with a torsionally flexible 531 frame would have to be different to an early Cannondale with its 2 inch diameter downtube. If I had only ever experienced shimmy on the 531 frame a hypothesis about rider mass and spring constants would appear to be plausible. But having experienced shimmy on the Cannondale, it breaks down. Gripping the tube with the knees certainly helps. Maybe it helps the balance mechanism - I have noticed that correction is partly down to learning to anticipate the motion and gradually adjusting motor control of the arms. Braking is a damper (as is anything that converts energy to heat) but it is also guaranteed to reduce kinetic energy before running out of road. Fortunately it does not happen enough to allow a thorough technical analysis. |
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