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Old Feb 10, 2013, 07:24 PM
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My 2nd Slickest Trick In CL-Someone Must Have Done This Before But I'd Never Seen It

before I "invented" it. Hinge the rudder and install a control horn with a clevis anchored to the vertical fin. We've all seen someone crash a brand new plane as it came in on the lines. Use lots of rudder, than find that sweet spot and glue or fix the rudder and remove horn, clevis, etc.
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Last edited by tigreflyer; Feb 10, 2013 at 07:33 PM.
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Old Feb 10, 2013, 09:13 PM
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Hate to say it but you haven't actually invented it . There's another version called a Rabe Rudder where the rudder is linked to the elevator. Up elevator gives a small reduction in rudder deflection while down increases it. The idea of this is to use the rudder to counteract yawing of the nose due to gyroscopic precession of the prop.
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Old Feb 10, 2013, 09:26 PM
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i made an adjustable rudder by putting a slotted plywood plate on the bottom end of the rudder. An allen head bolt through the slot into the fuselage kept it in place. I learned quite a bit by fiddling with it. Now, I build rudders with 0 offset, except for OTS airplanes where a little is needed to make it look right.
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Old Feb 10, 2013, 10:16 PM
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years ago (prior to 1975) carrier planes often used a movable rudder when the plane went into slow speed. The rudder was connected to the same mechanism that operated the ailerons, usually the hook release. after sliders came into the picture it wasn't needed. Today it is only seen on nostalgia models.

Another trick was to use a spring on the rudder, during high speed it would straighten, when you slowed down you would get more rudder offset.

I still have planes with both systems
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Old Feb 10, 2013, 10:59 PM
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PS attached is a drawing of the carrier rudder system
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Old Feb 11, 2013, 07:22 PM
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More than one of us has done something similar.

Quote:
Originally Posted by Jim Thomerson View Post
i made an adjustable rudder by putting a slotted plywood plate on the bottom end of the rudder. An allen head bolt through the slot into the fuselage kept it in place. I learned quite a bit by fiddling with it. Now, I build rudders with 0 offset, except for OTS airplanes where a little is needed to make it look right.
I didn't actually hinge a section as large as a full-scale propeller driven plane might have, more like a large trim tab. I was already pretty sure that rudder offset was counter-productive. But all the circumstances have grown vague with time. It had to have been the early 1970s, perhaps before that. I have to guess that it related to a sport plane, either a Buster or a Shoestring.

Maybe Jeff would remember, but he would've been very young (under ten, probably).


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