I'm a little confused about how to mount control horns on the GP Spacewalker ailerons. You can feel the aileron horn block on the bottom side of the aileron, but not on the top. Shouldn't there be some wood on the top side of the aileron for the servo horn mounting plate to rest against? As it is now, there is a lot of space between the block and the covering on the top side. Or is the horn supposed to be fastened to the leading edge of the aileron, with the horn block there as support for the leading edge?

Also, GP did not provide the large scale control horns it recommends for the ailerons. I was considering using the Dubro adjustable control horn (.40-.91 or .91 & above). If you have a GP Spacewalker, what have you used?

Thanks for any ideas or tips on this one.

Here is what I used on mine and they have held up with no problems. I drilled the opposing corners of the horns and put four screws in each one. I hardened the screw holes in the ailerons with thin CA and just used wood screws.

http://www2.towerhobbies.com/cgi-bin...?&I=LXD936&P=7

Bruno,

I believe you are supposed to use the horn portion only, not the back plate.
Use self tapping screws. Drill small holes, insert the screws, then take them out, harden the holes with thin CA and reinsert the screws.
It has held up fine like this on my Spacewalker

I was also surprised GP overlooked this. Giant scale horns are the answer but when I built my SWalker they were not available at my local supply shop so I used long 2mm machine screws with lock nuts & they did the job. Whatever you do don't use the short screws supplied in the box.

Thanks guys. Appreciate it. I was thinking along the same lines. Just need reassurance. I don't understand why GP included horns for the aileron and elevator, but not for the ailerons.

Stick Jammer, I held that exact horn set in my hand at the LHS yesterday, but didn't buy them. Back to the LHS Monday.

I wanted to avoid hardware on top of the aileron, and also wanted the screws into hard wood, not balsa, so I glued birch ply plates to the ailerons first and covered them. Then the kit horns and short wood screws worked fine. That was about 5 years and lots of flights ago.

Thanks Swooper. I might just try that. I don't have any scraps of Monocote though. I wonder if I could cut the plates to the same area dimension as the control horn base.

Actually, I think you could jab a pin into the aileron dozens of times as deep as the screws go in, and soak it with thin CA, and it would hold wood screws OK. It would also provide a hard foundation for the horn to bear upon.

That'll work too. Thanks a bunch.