First off...i'm not a noob when it comes to rc planes and flying,..... but the question might be
My skill level is <u>somewhere inbetween </u>sport flying and 3d flying.
I have been flying foamies for about two years and I have flown the stratos, super cub, cessna 1400mm, p-40 warhawk 1400mm, p-51d mustang1400mm, pitts python 1400mm .I bought myself a 1400mm foamy Dynam SU-26. it uses a outrunner 650kv motor with a 50 AMP ESC and using a 4 cell 2800 MAH batt.The trouble that im having is not taking off nor is it flying and doing stunts...it's the landing. With the plane weighing 2.85 LBS Iknow that (for me)it is to light with that motor.My problem is landing,more exactly getting it to come down to earth and not staying in the air. Dont get my wrong ...I know how to land.Ihave lost count how many times i have landed.
What i'm trying to say is that im going to balsa for my next plane. The new plane will be the SU-26 made from balsa with the same motor.

Now for the question. With that motor how do u calculate thrust to weight ratio. Is it a personal feeling like expo or is there a formula to it