I've got an eRc Cub I picked up a few years back loaded with the servos but no motor/ESC. I'm finally getting around to getting it in the air..... I have a few unmarked motors I can put on the plane. The flying weight should be 650-700 grams, the motor I'm looking at using measures out to be about a 3310, 1200 RPM, 4.2 amps no load on a 3s give or take. It will turn a 9.6x7.5 prop and produces a max thrust of 750 grams @11 amps. I'm thinking that should be enough thrust for take off, but 1/2 -2/3 throttle, thrust produced is 400 grams. Is that enough to maintain flight/cruise? It's a cub, not looking for sport performance, just cruiser. The motor doesn't seem to be overly taxed spinning the 9.5, I'm guessing it could spin a 10 or 11 in prop, but don't have one to test with right now.