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frank-margie(at)worldnet.
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 Posted: Thu Jun 08, 2006 4:14 pm Post subject: Taildragger Toe |
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Ref:
Frank,
May be some question about being astute, but I believe the FireFly does well
without toe-in or toe-out because the cg is almost directly above the line
passing through the center of the wheels. This design feature makes the
FireFly easier to turn while on the ground. Now comes the BUT. But it has
a tendency to make the FireFly more unstable due to weight shifts or side
wind loads while taxiing if there is toe-in or
toe-out.
As for why you would want to use toe-in or toe-out, I don't know the answer.
It does keep you busy on the rudder pedals.
Jack B. Hart FF004
---------------------------------------------
Good point. My buddy's MiniMax has no toe in or out, due to the straight axle, and it doesn't turn as well as a Kolb---it has the gear ahead of the CG. It doesn't have the noseover tendency of the Kolb, however. And it's not squirrelly---maybe due to the rigid axle not allowing wheel flex---and probably the low wing/lower down CG/shorter gear combo.
The U/L I referred to was a high wing tractor design, and it was still squirrelly with the toe in. The pusher designs tend to be less stable on the ground, due to the thrust being behind the CG; anything other than dead straight ahead gives an increased tendency to turn. (Tractor designs tend to pull back toward straight when turned slightly, IMHO) I was hoping there would be a lot more info out there, due to the Kolb being a pusher. And I was hoping a few of the engineering-background guys would weigh in on the subject. Guess this isn't as interesting a topic as alternative engines. Would sure beat the subject matter of a few of the recent posts, however.
Frank Clyma
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frank-margie(at)worldnet.
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| Posted: Thu Jun 08, 2006 4:14 pm Post subject: Taildragger Toe |
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Ref :
--> Kolb-List message posted by: Eugene Zimmerman <etzim62(at)earthlink.net (etzim62(at)earthlink.net)>
Frank,
Toe-out greatly increases the bending stress on the landing gear legs
during a hard landing,
but toe-in helps to minimize the bending stress.
In a hard Kolb landing you will wish you had some toe-in,
but I agree with you about the toe-out handling advantage
----------------------------
Hadn't thought about that angle. Thanks!
Frank Clyma
do not archive
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