A low disk loading improves autorotation performance in rotorcraft. Gliding in a helicopter is called autorotation. This provides for continued flight control and an autorotation landing. To recover without autorotation, the Zefhir is fitted with a ballistic parachute safety system. The pilot performed an autorotation landing in a forest following the failure of both engines. There are three basic flight conditions for a helicopter&colon; hover, forward flight and autorotation. In case of an engine failure, the switch from helicopter to autorotation was automatic. On 10 May 1937, it accomplished its first autorotation landing with the engine turned off. The autorotation characteristics are poor partly due to the rotors' low inertia. By using autorotation he was able to land the aircraft safely. This high altitude autorotation also set a new world record. Also listed was improper operation of flight controls during the power-off autorotation. Much time is spent in training practicing various types of autorotation. Pateras-Pescara was also able to demonstrate the principle of autorotation. It may also occur during an excessively rapid entry into autorotation.