mjerome,

As long as the wing receives enough air speed, and it is facing it at positive angle of attack (more than zero and less than 12 degrees), the wing will lift the weight of the rest of the airplane.

For a relationship between model weight, engine and propeller, check these articles:

http://findarticles.com/p/articles/m...=rbxcra.2.a.22

http://findarticles.com/p/articles/m...=rbxcra.2.a.22

http://findarticles.com/p/articles/m...=rbxcra.2.a.33

http://findarticles.com/p/articles/m...=rbxcra.2.a.33

Regards!