Aligning Wing Control Surfaces

[GeoffM]

Hey Guys, I am just finishing building a Timber Balsa ARF.  I have the wing control surfaces aligned to the root of the wing or closest to the fuse - Flaps + Ailerons.  This plane has wing tips at the outside of the wing and the surfaces are sitting roughy 3mm below these tips at the trailing edge - equal amount off on both sides. 

Now the question.  Do I align the surfaces to the outside edge or the root of the wing. 

I should mention the flaps are at full throw up being flat to the root (can't go any further up.  If I align to the outside of the wing the ailerons will sit 3mm about the flap for alignment.

Thanks in advance for recommendations.

[Michael]

The parts of the aileron furthest from the fuselage (closest to the wingtips) are more effective.

I would have those parts (nearest to the wingtips) of the ailerons exactly level with the wingtips.

I sometimes put both ailerons slightly up by about 1 to 1.5 mm. This makes the plane slightly less susceptible to stalling.

 

[octagon]

The important thing is that they are the same on both sides.

[Frank v B]

Geoff,

Michael is right to make them level with the tips, otherwise you are building in "wash-in" into the wing which will speed up a stall.  Err on the upside.

Photos?

Frank