Thread: Discussion Control for twin rudders?
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Old Oct 05, 2012, 09:19 AM
bogbeagle is offline
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That is going to be tricky. There is usually a lot of lost motion with twin-rudder setups.

I did think that you could hinge the whole tailplane, such that it rotates a few degrees about the normal axis. But, that might complicate the elevator' arrangement ... if you are fitting an elevator, that is.

I like the idea of the single rudder. And, I like the idea of the pull-only system, with a spring return.

If it were mine, I'd plump for the latter, I think. Very light pull-wires could be reasonably routed around the various angles and the whole set-up should be quite positive. I've certainly used flying controls that are spring-biased ... admittedly, on a much larger model ... but they worked really well.

I once knew a bloke who used a similar system to control the throttle on a Tartan Twin. Basically, he had a bit of string which pulled the throttle to OPEN; the thottle returned to CLOSED under its spring pressure. Sounds a bit crap, but it was a really good system, because it was easy to route and it completely isolated the servo from direct engine vibration.
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Last edited by bogbeagle; Oct 05, 2012 at 09:25 AM.
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