Re: Something like landing gear testing


Sir Gall, point taken about friction coefficient but what about the non expected crippling loads as the wheel and axle rolled over? It was nice of the wheel to stay put under the strut like it did making itself a nice sparky skid pad with lots of area relative to a naked strut stanchion. I noticed in the replay when the aircraft finally stopped moving the strut rebounded .
Also kudos to the pilot for such a nice straight landing ! I think LAX may have to repaint that center stripe.

Damian Gregory N8427 Q200

-----Original Message-----
From: David Gall <David@...>
To: Q-LIST@...
Sent: Thu, 22 Sep 2005 09:06:23 -0800
Subject: Re: [Q-LIST] Something like landing gear testing

I was amazed that the strut did not snap off.

Damian Gregory N8427 Q200

Amazed, why? You might think that the load from a skidding tire would be more
than that of a rolling tire, but with good anti-lock brakes the coefficient of
friction of a rolling, braked tire is greater than the skidding friction. Why
else would you see so much TV hype about anti-lock brakes on cars? Well, that
same coefficient of friction can be generated in a crosswise direction by a
steered, rolling tire without brakes. That's the situation for a nose gear,
except that the load is lateral instead of longitudinal. So, the nose gear
should be as strong laterally as a main gear is longitudinally, right? And since
most nose gear components are round, they should be just as trong longitudinally
as laterally, right? More so, since they're braced in the longitudinal direction
by all the retraction links.... And finally, the coefficient of sliding friction
of metal against pavement is less than that of rubber against pavement. So,
there should be nothing "amazing" about the event. Damn good flying, just using
a nose skid instead of a nose wheel. Oh, yeah, nice sparks and smoke, but a
non-event. (Fire extinguishers at the ready for the aluminum/magnesium fire
excepted!) Have a nice NDT day. :-)

David J. Gall

P.S. Kevin thanx for the cool link!

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