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KFfan, 24 Mar 2015
Posted 24 Mar 2015
Posted 19 Mar 2021
Nice! I would'a never thought of using a bicycle shifter.
Posted 25 Mar 2021
I like the idea of using a spring & cable, the install looks pretty clean. Is the tab fully adjustable or is the shifter a more "on or off" approach?
Posted 25 Mar 2021
I have electric trim on my Kitfox 4. It really helps to slow the plane down on landing if I crank in a bunch of trim. Problem is that the electric trim is pretty slow. And then it's slow cycling back to neutral for takeoff. This is what I did to solve that issue. Takes just a second to pull up the bungee cord. Now I just use the electric trim for cruise settings. 1/4" aluminum solid rod, flattened the ends, and riveted them to the joy stick. JImChuk
Posted 28 Mar 2021
One of the main reasons I modified the tail of the Mangy was to incorporate a trim tab. Hindsight, I would have made it bigger...
I suppose if I had made a bigger trim tab then the one I have, the electric trim would have needed to move the tab less for the same results. That would make it operate faster. The bungee I did is supper quick though, and I'll probably just use that for landing. On another trim situation, I have to ride the right rudder pedal. I ended up shortening the cable a 1/4" or so, that makes the pedal a bit higher. I think subconsciously we want our feet even in cruise. If that doesn't work, I'll use a stronger rudder spring on the right pedal. Hate to put a trim tab if I can avoid it. JImChuk
Posted 26 May 2021
Just an update on this last post of mine. I did make a different lever for tightening the bungee for the landing trim, and it works real good. Posted pictures in another thread. Ended up going with a rudder trim tab, and after a few adjustments, it's working fine. JImChuk
Posted 23 Aug 2021
I haven't flown my plane yet but I'm betting trim tabs on all three axis would be a good thing!
Plane should want to fly level on it's own if it's rigged right. Twisting the wing a bit will lift a heavy wing. Sometimes a small rudder trim is needed if it doesn't want to fly straight. I ended up putting a small one on my Kitfox. Elevator trim becomes more needed though, cause you have the elevator in a way different position for cruise flight verses landing configuration. That is when an adjustable trim tab can help quite a bit. On our Chief, the elevator is pretty heavy if you aren't trimmed out. On my Kitfox, I tend to float a good bit further without landing trim, and in my Avid, I don't use elevator trim at all except for level cruise flight. Here is what I ended up with for a trim lever for landing on the Kitfox. It works real good, way faster then cycling the electric trim back and forth. Now it just gets used for cruise flight. JImChuk
Posted 4 April
I thought I had corrected this a long time ago, but if anyone copies this design, make sure you put a stop to limit travel on top and bottom. It will get your attention if it jambs against the seat truss because you pushed it to far.
Posted 15 April
On the topic of rudder trim tabs... None are ever needed, Grab the top of the vertical fin and the tail post and put a little pressure on the leading edge to bend the fin to get it to fly straight. This is the same thing that is done for super cubs etc. A little tweak and you don't have goofy tabs hanging off the back of the rudder causing drag.
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