My dad is flying a Pica Waco thats the same size as the Stearman. It has a os 120pumped in it. It flyies very scale like using altitude to gain the airspeed. He's taking the 120 out for another model he's building. Looks like a Saito 150 will be taking it's place. It's awesome being able to make it look real in the air. Not to many people can make them look scale gotta fly them full throttle all the time..
Later,
Frank