Thanks for the info/ comments. I hadn't thought about the lift curve so as I progress, I'll watch the throw. I watched the Su video of your plane, Dan, and it looks like it flys quite well. I'll try and upload a couple of pics. Right now I have a BB 48 oz servo and 4-40 rod, but just for a mockup. The surface moves quite easily but too much 'give'. I'll need aluminum arm and probably 3/16 th to 1/4" rods