i gave this a lot of thought and figured that there is no way anyone would want their model to fly realistikly,,,,,my 450 stearman was an absolutly unbeliveable performer, but it would not be much if scaled into a 25% scale model. it would do a great 1000 ft immalman from 80 mph. sure looked great and was an eye opener for a passenger but to scale ? your model would run out of steam at 250 feet just when the modeler would want it to be hauling butt straight up ! dont get me wrong butt a stearman was great with all that power from 985 cubesw butt scale performance would be crappy to say the least. a scale cub ???? my God,,,a 65 Cub cruiseds at about 70 mph indicated. dont get caught 200 miles from home fasing a 25 mph head wind. hehe,,,,,the stearman cruised at about 85 indicated. and staled at 54 for a perfect 3 point landing. scale that down and your models would still be flying until it ran out of gas. ,,,,the4 best you can do is slow the mopdel way down and do you things very slowly and bore yourself to death.