Folks,
I am building SPADs but my question seems broader than just that style of airplane. If I put two servos on a wing ... one on the left and one on the right ... should I mount the servos on the top of the wing, bottom of the wing or does it really matter?

Neil

Well, It doesn't make a difference in how they work.
But, on hand launched models, I put the servos on top to keep them out of the grass.
If the plane has landing gear, I put them on bottom, as it looks much nicer.
Doug

Neil,
Since it's a SPAD I am assuming the wing bottom is flat.
If that is the case I'd put it on the bottom just 'cause it's easier to do.
Good Luck,
KW_Counter