OK...if we forget my flawed theory that horizontal drops provide more stability than track ends...(I still think it has validity), the original discussion was about which device will hold a wheel in place better than the other. I think Mr Ferris has cleared the issue up somewhat...
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that gives a potential of yield strength on a standard steel skewer of around 1,610-pounds based on the root dimension of the threads (4.2mm nom.). Since the skewer must clamp both dropouts using a common rod, total clamping pressure is equalized over both dropouts. If we assume the same properties for a 4130 track axle and nut of standard dimensions, 10mm, then the potential clamping pressure is limited by the root dimension of the axle threads (8.8mm) and its ability to resist tightening stresses, preload, and external load. That'd be about 7,000-pounds and since each nut clamps each dropout between itself and the face of the axle, that's 7,000-pounds per dropout. You can give or take a few ksi for stuff I didn't account for, but I think that's pretty close.
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They are not even in the same ballpark. Yes?
Warren Young
Toronto
>Don Ferris wrote:
>>
>> Chuck Schmidt put it this way:
>> "Is there any difference between a big road sprint in the Giro or Tour
>> with Cipollo pounding down the road using a QR to hold his back wheel or
>> Marty pounding down the velodrome using a nut to hold his back wheel.
>>
>> Neither slip, so it must be that nobody wants to collide with a QR lever
>> on the track."
>> **********
>>
>> IMO, yes, there is a difference. Cipo is using vertical dropouts which are
>> not subject to slipping like a horizontal.
>
>
>Ah, of course, vertical dropouts...
>Well, before Cipo, before vertical dropouts, slipping wheels in
>horizontal dropouts was not a problem. I'm talking here of pros and
>Campagnolo QRs and Campagnolo horizontal dropouts. If it was a problem
>there would have been a change.
>
>I'm not talking about current QRs made from aluminum, composite etc.
>without enough clamping force to keep from slipping in a horizontal
>dropout, which of course would be off topic.
>
>Also, making allowances for the axle compression from the QR closing
>force affecting the bearing clearances was common knowledge "back in the day."
>
>Chuck Schmidt
>South Pasadena, Southern California