If you can only afford 1 strong servo put it on the rudder. Next priority is elevator. Consider using a 5 RX cell pack that gives more power and servo speed for a very small cost.

I fly a similar sized model and LOVE my West 50 T1 plus the matching throttle pipe turning an APC 13x4 wide. IMHO the BEST 50 size 3D 2stroke set up. However it is going to be expensive in the US.


If you go the Saito 82 route in a 40 size profile then you MUST reinforce the wing to fuz join with glasscloth and add braces to the tail. The vibration these engine produce is ferocious and will literally cause models to self destruct in the air. [How do I know ?]