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. . . I would suggest that you move the bellcrank on the Ukey to the bottom of the fuselage. Otherwise you can have trim problems with a too low vertical CG. I would also suggest that you substitute Two wheel landing gear, especially if you are going to fly it from a stooge.
Good luck with the Ukey. It's simple and ugly, but it is remarkably capable.
John --
Some might disagree, but I'm with Peter 100% on moving the bellcrank. I don't see the point in trying to trim an airplane with a built-in handicap of a "too low" CG (I'm assuming the two wheel gear swap, never had a single wheel
U-Key)
CG is critical with the small tail -- 1/8" too far back and it's like trying to fly with an egg-beater up your hiney with a wild man turning the crank. 1/8" too far forward and it doesn't turn at all. My preferred CG is 2 3/16" from the LE (Vanessa), with 2 1/4" getting marginal. With a Fox 35 and Fox Muffler, that is about where you will be (at least that was true on the old Joe Just versions).
I've had three or four U-Keys (depends on how you count a "new" one), and all took additional wing tip weight -- 1/2 to 3/4 oz from my notes. All had an outboard trim tab for final wing leveling.
Peter's line length / lap times are fine. My previous preference was a foot shorter, maybe a .1 sec faster, but right there is fine.
The
Gotcha III probably needs the LA 40 anyway to do it justice -- it is a lot more airplane than the
U-Key!
Larry Fulwider