Hi, the problem with the first certified autogyros like the Air and Space and McCollough was cost. They used stock helicopter rotor heads and blades and that shot the price sky high. Also they are not fast, won't VTOL and the vibration level is quite high, at least in the ones I have flown. You must remember that when they were invented in the late 1920s there were no helicopters and the gyros were the only game in town. That is no longer the case. Norm