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Re: Toe

Bob Farnam <bfarnam@...>
 

There is a practical aspect to this discussion. If you use a full-swiveling tail
wheel, then you don't need as much travel on the tailwheel belcrank to be able
to maneuver tightly on the ramp. However, full-swiveling tailwheels generally
have a release cam set to go into full swivel mode at somewhere around 20 or so
degrees depending upon the make. You want to set the ratios to make the
tailwheel as docile as possible at high runway speed, but still be able to reach
the cam position with full rudder input. That is what Jim Patillo and I have
done. Our airplanes are easy to steer at high speed and can still pivot around a
main wheel when we want.

Bob F
Q200 350 hours

"David J. Gall" wrote:

CE:

I'm not so sure that 4:1 is advisable. There are a LOT of other factors that
I did not mention that must be considered when choosing a rudder/tailwheel
ratio. Four-to-one might seem best for the ONE consideration that I listed,
but even that has mitigating factors to consider. I did not address the
issue of control power at all; that factor alone will significantly affect
the preferred ratio. What if the tailwheel's control power is only 1/4 that
of the rudder - then the preferred ratio would be back up to 1:1.

Neil's is the first report that I've seen of a tailwheel that might be too
effective. I would not recommend that you do any design changes based on his
report and my comment alone. He has a non-standard tailwheel setup that just
might be the only one like it in the world. Like they say on the mileage
sticker on cars: "Your results may vary."

The 11-13" camber measurement is done during new construction. If you have
already built your plane, it is sufficient to measure the camber at gross
weight and verify that it is neutral or slightly positive.

I'm not sure that the toe changes as much as you seem to indicate.

Good luck,

David J. Gall
P.S. Did I say to use string...?
http://david.gall.com/files/Airplane/quickie1.txt

-----Original Message-----
From: dfwsfug [mailto:dfwsfug@...]
Sent: Tuesday, December 18, 2001 9:32 PM
To: Q-LIST@...
Subject: [Q-LIST] Toe

We have not taxi tested yet or flown.Wondered about the weight verses
empty on the toe of the mains. If we set for neutral toe empty. That
will give us some positive toe (toe-out) under load at increasing
rate up to gross which also gives us a higher landing/rollout speed
when extra directional help needed.The camber of 11-13 " was
mentioned how is that measured? We can use the Gall-string method for
toe but what for camber? We have a direct rod link rudder to solid
tailwheel.Ratio 1:1 no springs. Considering taking the advice to
build another fork using pneumatic tire and change the Rudder to
Tailwheel ratio 4:1 for initial self checkout period.Can bolt either
on.
CE in Southern Saskatchewan

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