James Annan wrote:
David Martin wrote:


Maybe it is time to find a pair of forks, a standard q/r hub and a
machine
that can do a lot of pulling and measure it..


Um....this has actually been done, systematically and fairly thoroughly.
There's a published test report linked from my website (surprise).

The pullout resistance achieved in real life seem to generally be way
below jim beam's theoretical calculation (which, to be blunt, completely
misses the point, irrespective of whether or not his figure can be
achieved in some circumstances).

James

um, this test report
http://www.engr.ukans.edu/%7Ektl/bicycle/QRReport1.pdf
is really rather weak.

it spends an inordinate amount of time doing 10th grade science class
testing on clamping force, merely a function of cam displacement - even
to the extent of bothering to see whether fork material could affect q/r
lever closure force [sic] - but then goes on to ignore the elephant in
the room, the effect of different fork materials and axle end serrations
on pull-out force. it does briefly touch on "embossing" of fork ends by
serrated axle faces, but doesn't bother to investigate it in any detail.
critical details missed in my opinion.

maybe that's why it was cited?