Using autorotation helicopter can be landed safely in the event of complete engine failure. Consequently all single-engine helicopters must demonstrate this capability in order to obtain a type certificate.
The height–velocity diagram (for a specific helicopter) shows the flight profiles, where autorotation can be safely performed.
Articles on Wikipedia about autorotation and H/V diagram:
If main engine or both engine fail, but helicopter was operated in the safe H/V profile, then it is possible to land safely. It is a safety feature of hely, so don't be afraid to fly! ;)
The height–velocity diagram (for a specific helicopter) shows the flight profiles, where autorotation can be safely performed.
Articles on Wikipedia about autorotation and H/V diagram:
If main engine or both engine fail, but helicopter was operated in the safe H/V profile, then it is possible to land safely. It is a safety feature of hely, so don't be afraid to fly! ;)
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