This idiot from my neighbourhood gave me an xml file of an 80% dismantled copter with no fuel or propellor, atleast the body was intact. His request was to fix it, so I fixed it. The propellor is made to rotate on its own, with zero pitch. All you have to do is to increase or decrease the Pitch using VTOL so that it goes up or down. The Trim controls the front and back rotation of propellor. The forward thrust can be also provided by two jet engines powered by Throttle, that were already inside the chasis. Landing Gear expands and retracts the landing mechanism. The craft is not buoyant, so it sinks. Yaw controls the direction and Roll & Pitch does what it always does. Brake toggles the winch. For starters, take VTOL and Trim all the way up & enjoy the journey.