I don't know what you have for power. I have both mentioned palne and both flew great. The Learjet with stock motor, 14 x 2000 with motors are in series. It took off the ground and 5 minutes flight is not a problem. The landing gear has problem, they put them to far forward, the gear should be about 1" further back so it would NOT sits on its tail when you have the CG corrected. The T-33 with stock fan and 7 x 2000 flew fine until the motor gave up after about 200 flights.