response to Ben C Thread deleted from urcm Asymetric load
thirty-six
> On 2009-11-03, thirty-six <thirty-...@live.co.uk> wrote: ^^^^ 0:54 9th 11 09 ^^^^^
>
>
>
> > On 3 Nov, 17:01, Ian Jackson <ijack...@chiark.greenend.org.uk> wrote:
> >> In article <4c1d0f56-a66e-4120-a23e-41e7f0fe7...@d21g2000yqn.googlegroups.com>,
>
> >> thirty-six <thirty-...@live.co.uk> 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.
Happi Monday
the new group :-)
chris French
<acd74acb-cb79-4373...@a21g2000yqc.googlegroups.com>,
thirty-six <thirt...@live.co.uk> 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
Alan Braggins
>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.
thirty-six
wrote:
> 1. Threads cannot be deleted from urcm, a post can be rejected.
So what happened to his posting which I replied to?
Trevor A Panther
news:slrnhfi9u...@chiark.greenend.org.uk...
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
Trevor A Panther
news:r1aKm.85038$y%.52228@newsfe29.ams2...
> "Alan Braggins" <ar...@chiark.greenend.org.uk> wrote in message
> news:slrnhfi9u...@chiark.greenend.org.uk...
>> In article <0SexB4Cm...@blackhole.familyfrench.co.uk>, 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!
Clive George
"thirty-six" <thirt...@live.co.uk> wrote in message
news:14d6a31f-9078-4cda...@l2g2000yqd.googlegroups.com...
Message-ID: <slrnhfefk5....@bowser.marioworld>
http://groups.google.co.uk/groups/search?as_umsgid=slrnhfefk5....@bowser.marioworld
Is that the one you mean?
Looks to be there to me.
Alan Braggins
>
>Then I suggest that you do likewise and post your comments on urcm.
And I suggest you get a fucking clue. I was replying to a post made in urc.
urc is the right place to do that.
Mr Benn
uk.rec.cycling, the newsgroup so unusable that a moderated group had to be
urgently formed!
I knew they'd be back.
Trevor A Panther
And I suggestt hat you learn to be able to respond without "f"ing and
"C"ing.
If you are unable to do so then I doubt your ability to carry out the
actions of a moderator -- but I always did!
So let me respond in similar fashion
Which I dislike doing
But for you
Allan Braggins -- why don't you fuck off and get back to urcm. You are a
pain in the arse
FUCK OFF you stuipid ......
There you are I can do it just like you.
Except I find it demeaning to myself and I apologise to others who read
this. Sorry
Keitht
> "Alan Braggins" <ar...@chiark.greenend.org.uk> wrote in message
> news:slrnhfis0...@chiark.greenend.org.uk...
>> In article <r1aKm.85038$y%.52228@newsfe29.ams2>, Trevor A Panther wrote:
>>> Then I suggest that you do likewise and post your comments on urcm.
>> And I suggest you get a fucking clue. I was replying to a post made in
>> urc.
>> urc is the right place to do that.
>
>
> And I suggestt hat you learn to be able to respond without "f"ing and
> "C"ing.
>
> If you are unable to do so then I doubt your ability to carry out the
> actions of a moderator -- but I always did!
>
> So let me respond in similar fashion
>
> Which I dislike doing
>
> But for you
>
> Allan Braggins -- why don't you fuck off and get back to urcm. You are a
> pain in the arse
>
> FUCK OFF you stuipid ......
>
> There you are I can do it just like you.
>
> Except I find it demeaning to myself and I apologise to others who read
> this. Sorry
>
>
>
Trevor, is there a point in you posting this here?
If you want somewhere to air your personal dirty washing try
uk.rec.handbags instead of here.
Don't apologise - you posted it here and meant to, if you didn't meant
to - don't post it.
--
Its never too late to reinvent the bicycle