??????? ????? ???? ???? ??? ???? ?????? ?? ?????? ???? ????? ?? ???????? ????????? ????? ?????? ????? ?????? ????? ??????? ???????? ?????? ?? ?????? ?? ???????.Some helicopters have more than one rotor and a few have rotors turned by gasoline jets at the ideas. Some Have got a tail rotor to counteract the rotation of the leading rotor, also to aid