Hmmm...I wonder if we expect differing performance levels than we would with full-size aircraft. One light airplane, the Carbon Cub, advertises that it has 1 Hp per 7 Lbs of aircraft weight. It can take off in about 3-5 fuselage lengths, depending upon weight, and reach 7500 feet within 5 minutes. I guess the differences can be explained by the differences in model aerodynamic effects and full-size aerodynamic effects.

I wonder how much thrust a .40-size engine is giving that .40-size trainer that weight 4-5 pounds?