Shahryar Hedayati
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simple the pressure in helicopter is not on engine as they can continue their flight if you turn the engine off and put it offline .
Yeah that's Autorotation - Wikipedia, the free encyclopedia
after engine shot down helicopter wont fly rather it will start drooping out of sky safely using it rotor blades as an emergency parachute but there is also a limit to this phenomenon ,
Dead man's curve
I want to repeat this fact that the upward force in helicopter is produced directly by engine itself
and this will put too much pressure on engine compared to the fixed wing airplanes
For more info you can search the story of Harrier Jump Jet and vetical take off airplanes