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frank-margie(at)worldnet.
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 Posted: Tue Jun 06, 2006 7:29 pm Post subject: Tauidragger Toe In/Out |
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Ref Jim's info:
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| Quote: | I always set camber at 7 degrees with the weight of the aircraft on the
wheels.
When you set your skinny or fat butt in the aircraft you have about 0 to
2 degrees camber.
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| Quote: | I always use 0 degrees toe in or toe out.
Jim Hauck
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Are there published spec's for Kolb toe and camber settings? EAA has published some good info on toe in/out, basically saying that taildraggers are better off with toe out. According to the article(s), toe out helps prevent ground looping, because the slight outward bias keeps the machine going straight. Especially when the weight shifts to one side, that tire will resist the aircraft turning in the opposite direction (it would turn toward the other side if it had toe in). (This was mentioned on The List a while back, but I don't believe that discussion reached any conclusion.)
We cured a bad case of squirrelly ground handling (in a taildragger ultralight) by changing the original toe in condition to toe out. We were supprised at how much difference it made, it was much more than we expected. Based on that experience, we have been true believers in toe out for taildraggers.
Which is why we were confused when we were shown manufacturer's literature that specifies toe IN for some standard cert taildraggers, specifically Cessna 140 and Stearman. And we've been told that many other standard cert taildraggers also specify toe IN for the factory settings.
Now we're REALLY confused. Can any of the technically astute folks on this list shed any light on the subject?
Thanks,
Frank Clyma
Orange Park, FL
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jbhart(at)onlyinternet.ne
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| Posted: Tue Jun 06, 2006 8:13 pm Post subject: Tauidragger Toe In/Out |
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From: "frank & margie" <frank-margie(at)worldnet.att.net>
To: <kolb-list(at)matronics.com>
Subject: Tauidragger Toe In/Out
Date: Tue, 6 Jun 2006 23:26:14 -0400
Sender: owner-kolb-list-server(at)matronics.com
Reply-To: kolb-list(at)matronics.com
X-Virus-Scanned: by amavisd-new at onlyinternet.net
..............................................
Now we're REALLY confused. Can any of the technically astute folks on this
list shed any light on the subject?
..............................................
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
Winchester, IN
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Eugene Zimmerman
Joined: 10 Jan 2006
Posts: 392
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| Posted: Wed Jun 07, 2006 2:41 am Post subject: Tauidragger Toe In/Out |
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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.
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