My friends 1/3 scale Pitts is a real hot rod whth a Brison 50, and the stearman is considerably smaller. I think it will rip the porr plane apart. He's being a bit greedy, they fly fine with a 26, and a 40 max would make it totally crazy with power. The Stearman is a crop duster type plane, not a high speep stunt plane like the Pitts. Just a big lumbering teddy bear...