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response to Ben C Thread deleted from urcm Asymetric load
On 8 Nov, 22:00, Ben C wrote:
On 2009-11-03, thirty-six wrote: ^^^^ 0:54 9th 11 09 ^^^^^ On 3 Nov, 17:01, Ian Jackson wrote: In article , thirty-six wrote: [...] The shock a wheel receives from the road is displaced into the rim. It is spread around the rim so that it acts upon the hub in all directions thus cancelling itself out at the hub. I've found most of "thirty-six"'s posts quite impenetrable. But this claim jumped out at me as obviously nonsensical. Are we really being told that when the wheel hits a bump in the road, no net bumping impulses are imparted to the frame via the hub ? I put it there to wake you. Cancelled is too strong a word, but I could't be bothered trying to work out precisely how much the shock may be reduced by using a typical bicycle wheel made from a shallow rim and wire spokes in comparison to a solid disc made from say laminboard. It may be too complex for me to work out and I dont intend to test a solid disc and tyre over cobbles. If you consider that the spokes strain pretty much equally for around 5/6 of the wheel, then there is a significant proportion of shock energy which can be absorbed by the horizontal components of the spokes which would otherwise go into moving the hub up and down. This absorbtion of shock energy is the advantage a tension wheel has over a compression spoked or solid disc wheel. The spokes absorb very little energy-- they are like undamped springs, They stretch, which means they gain energy, as does the rim which compresses. This is a temporary store. so even if they stretch and relax, or lose tension and gain it again, most of the energy comes back out again. Precisely. Correctly constructed there is little damping due to heat disipation. They can however reduce force at the hub in the same way the tyre can, by spreading an impulse over time: a lower force for a longer time transfers the same momentum as a higher force for a shorter time. Note that a tyre is more like a damped spring, so also absorbs a useful amount of energy. Yes you can make comparisons between a pnuematic tyre and a spoke/rim assembly. I dont follow what you say about spreading the shock over time. That has to do with the way the bump is traversed by the long tyre contact patch. It is not a direct function of the spokes, neither the spokes or the rim contain any damping material. There certainly isn't any cancelling out effect because of the spokes being in a circle. You can't make either energy or momentum just disappear like that. No, the energy is returned when the spokes contract as the load is relieved and the 'flattened' lower section of rim recovers to a tighter bend. |
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#2
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response to Ben C Thread deleted from urcm Asymetric load
Looks the the self-appointed ******* will be left on their own soon in
the new group :-) |
#3
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response to Ben C Thread deleted from urcm Asymetric load
In message
, thirty-six writes snip lots of stuff rambling about his ideas re wheelbuilding 1. Threads cannot be deleted from urcm, a post can be rejected. 2. Dumping disconnected posts rejected from urcm onto urc seems a stupid thing to do -- Chris French |
#4
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response to Ben C Thread deleted from urcm Asymetric load
In article , chris French wrote:
2. Dumping disconnected posts rejected from urcm onto urc seems a stupid thing to do Using urc if you don't like the urcm moderation policy seems a reasonable thing. Trying to use urcm and using urc only if the post is rejected does seem like trying to have your cake and eat it though. |
#5
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response to Ben C Thread deleted from urcm Asymetric load
On 9 Nov, 23:28, chris French
wrote: 1. Threads cannot be deleted from urcm, a post can be rejected. So what happened to his posting which I replied to? "On 8 Nov, 22:00, Ben C wrote: " |
#6
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response to Ben C Thread deleted from urcm Asymetric load
"Alan Braggins" wrote in message
... In article , chris French wrote: 2. Dumping disconnected posts rejected from urcm onto urc seems a stupid thing to do Using urc if you don't like the urcm moderation policy seems a reasonable thing. Trying to use urcm and using urc only if the post is rejected does seem like trying to have your cake and eat it though. Then I suggest that you do likewise and post your comments on urcm. Or isn't that allowed -- From Trevor A Panther In South Yorkshire, England, United Kingdom www.tapan.pwp.blueyonder.co.uk |
#7
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response to Ben C Thread deleted from urcm Asymetric load
"Trevor A Panther" wrote in message
... "Alan Braggins" wrote in message ... In article , chris French wrote: 2. Dumping disconnected posts rejected from urcm onto urc seems a stupid thing to do Using urc if you don't like the urcm moderation policy seems a reasonable thing. Trying to use urcm and using urc only if the post is rejected does seem like trying to have your cake and eat it though. Then I suggest that you do likewise and post your comments on urcm. Or isn't that allowed No it isn't allowed!!!!!!!!!!!!!!!!! Although it seems to me that is it is about talking about cycling in all its aspects. Just goes to show that the moderators dump as well! But of course I can take raise the whole matter on unnm --- where it will be totally out of context and nobody on urcm will see it! The dirt brushed under the carpet, by urcm, seems to getting to the stage where the door will be unable to open any more! -- From Trevor A Panther In South Yorkshire, England, United Kingdom www.tapan.pwp.blueyonder.co.uk |
#8
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response to Ben C Thread deleted from urcm Asymetric load
"thirty-six" wrote in message ... On 9 Nov, 23:28, chris French wrote: 1. Threads cannot be deleted from urcm, a post can be rejected. So what happened to his posting which I replied to? "On 8 Nov, 22:00, Ben C wrote: " Message-ID: http://groups.google.co.uk/groups/se...r.ma rioworld Is that the one you mean? Looks to be there to me. |
#9
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response to Ben C Thread deleted from urcm Asymetric load
In article , Trevor A Panther wrote:
Then I suggest that you do likewise and post your comments on urcm. And I suggest you get a ****ing clue. I was replying to a post made in urc. urc is the right place to do that. |
#10
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response to Ben C Thread deleted from urcm Asymetric load
"Alan Braggins" wrote in message ... In article , Trevor A Panther wrote: Then I suggest that you do likewise and post your comments on urcm. And I suggest you get a ****ing clue. I was replying to a post made in urc. urc is the right place to do that. uk.rec.cycling, the newsgroup so unusable that a moderated group had to be urgently formed! I knew they'd be back. |
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