hey guys....stop thinking like a regular heli...the trust created by the jets is the prim factor of this equation....the blades move in an opposit direction to the exiting energy from the jet....the body of the vehicle, thru drag, will tend to follow the directions the blades are rotating in...the speed at witch the vehicle travels depends on the friction present at the rotor bearins and the vehicle mass that is presented to the air around it..ie...if there is a lot of friction the heli will turn quicker but if the was a huge flat panel sitting flush to the direction it is rotating in then it would tend to act as an air brake and slow down the action of rotation in proportion to its size.....space travel is marvelous...time travel is quicker....zorro