I think there is more to it than a static pull on the chain
an engine does not produce a constant pull on the chain
Rick
----- Original Message -----
From: "DrMayf" <drmayf@teknett.com>
To: <ardunbill@webtv.net>; "Clay, Dale" <Dale.Clay@mdhelicopters.com>;
<land-speed@autox.team.net>
Sent: Tuesday, September 03, 2002 5:44 PM
Subject: Re: MC Chain
> Well, all...don't know much about bikes cept I once rode a Vincent. But,
> this is an interesting thread. If the breaking strength of the chain is
8800
> lbs and the rear chain wheel is say 8 inches in diameter (4 inch lever
arm)
> then the applied torque to the rear wheel would be over 2900 ft-lbs (no,
it
> aint lbs -ft)...obviously not doable. So the real truth of the matter is
> that you first need to determine how much traction you have before
slippage,
> ie tire spin, occurs. This would be the kinetic friction coefficient.
> Somewhere around 0.6 I imagine. So multiply that times the weight on the
> back wheel, say 250 lbs (? approx 1/2 bike and driver weight?) then rear
> tractive force isabout 150 pounds. If the rear wheel is about 26 inches in
> diameter then that translates to around to about 162 ft-lbs before the
rear
> wheel starts to lose traction. Then the torque or pull at the rear chain
> wheel must be around 528 ft - lbs. then the pull on the chain has to be
> around 1584 pounds. Seems like an acceptable margin of safety to me ( MS =
> ((8800 - 1584) /1584) = 4.5)! Is all of this right? WHo knows, but, it
> should clearly point the direction in thinking in engineering terms. Lot
of
> the above was really swagged...
>
> mayf, the red necked ignorant desert rat in Pahrump who used to own a Z1b
> Kaw...
>
>
> ----- Original Message -----
> From: <ardunbill@webtv.net>
> To: "Clay, Dale" <Dale.Clay@mdhelicopters.com>;
<land-speed@autox.team.net>
> Sent: Tuesday, September 03, 2002 3:20 PM
> Subject: RE: MC Chain
>
>
> > Dale, I suspect the rear fork might start to give way before you got to
> > 8800 lbs of chain pull! It would take an almighty violent abusive
> > clutch start to get that much snatch on it. Seriously, the pull on the
> > chain can be computed pretty easily by factoring the torque in the
> > gearbox output shaft and the size of the sprocket on it. Anybody want
> > to try that? I got into it many years ago and sent in an article to Bob
> > Greene when he was editor of Motorcyclist for a while. He said it was
> > nice, but 'too deep' for his mag. Bill
>
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/// what is needed. It isn't that difficult, folks.
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