when jumping start small and work bigger as you learn to control the attitude of the car and its "flying" caristics , you can usally control the car to an extent like gerwen said using the brake and the throttle in mid flight, but most of all you dont want to just go full throttle at a ramp and leave the throttle pegged all the way through the jump till it lands....... thats proablly why you are landing top side down....... another things you can do is find a nice hay field or somwhere with some tall grass and think underbrush no tress or bushes though just thick grass and try jumping you car into the grass just when you land hit the brakes so the grass doesnt wrapp around your axles but the grass should cushion the landing enought to kep things from braking which ever way you land top side down or right side up....... keep doing this till you can control you car in flight then go back to your original setup and you should be good to go