Well, G3 does not have the option to add a reverable prop facing the right direction. So I added a thruster, and it has reverse thrust. The thruster is controlled on a switch, POS. 1 = no thrust, POS. 2 full thrust. The throttle on the engine is used to fight the negative thrust which lets you control altitude. Since the engine is still blowing air over the surfaces you can control the plane. But i figured it would control the same if you had paddles for your rudder and elevator in real life.