I've got an .80 Saito in mine, it will take off in 10 feet, but it's perfect for dogfighting. I think anything from .65 up will work fine. I don't have any right or down thrust in mine, and I don't think it needs right thrust, dut a degree or so of down wouldn't hurt. It has a tendency to climb with power and I have a fair amount of down trim in mine which I have to change to suit the power application.