In an autogyro, the main rotor is freewheeling, it is not powered as in a helicopter.
503000000 can be written in scientific notation as 5.03 x 10^8.
Charles Lidstone has written: 'The gimballed helicopter testbed'
Michael Patrick Gilroy has written: 'An investigation of the effects of unsteady inflow modeling on helicopter simulation' -- subject(s): Helicopter flight simulators
Raymond W. Prouty has written: 'More helicopter aerodynamics' -- subject(s): Helicopters, Aerodynamics 'Practical helicopter aerodynamics' -- subject(s): Helicopters, Aerodynamics
Lucy Wilered Bellhouse has written: 'The helicopter children' 'The Christmas caravan'
I. C. Cheeseman has written: 'The effect of the ground on a helicopter rotor in forward flight'
J. Meijer Drees has written: 'The field of flow through a helicopter rotor obtained from wind tunnel smoke tests' 'Airflow through helicopter rotors in vertical flight'
Bruce Charles Haycock has written: 'Development of a helicopter emergency maneuvers trainer'
yes
Paul G. Scott has written: 'Improved procedures training through use of aids developed from learning guidelines' -- subject(s): Helicopter flight trainer, Training of, Study and teaching, Helicopter pilots, Teaching
William T. Yeager has written: 'Loads and performance data from a wind-tunnel test of model articulated helicopter rotors with two different blade torsional stiffnesses' -- subject(s): Wind tunnels, Rotors (Helicopters), Blades
Edwin Fair has written: 'The doctors fair-- the practice of medicine from horseback to helicopter' -- subject(s): Physicians, Biography