11. In case of an engine failure, the switch from helicopter to autorotation was automatic. 12. I see no signs of autorotation , 13. That suggests autorotation was taking place. 14. Pilots are trained to anticipate engine failure and perform autorotation to the ground without engine power. 15. On 10 May 1937, it accomplished its first autorotation landing with the engine turned off. 16. This design could function in autorotation . 17. The aerodynamic principles which rotate the rotor are equivalent to that in autogiros, and normal helicopters in autorotation . 18. Target speed in an autorotation is and the glide ratio is approximately 4 : 1 in maximum-glide configuration. 19. In order to do an effective autorotation , you need sufficient height and speed, and a safe place to land. 20. In the event of power loss, autorotation was found to be difficult due to the drag from the ramjet nacelles.
