Jack Welles wrote:
apollo11 wrote:However the helicopter shaded unsafe operation area is substantially larger than that of the gyro.
I don't know if it makes a difference, but coming short in a helo in the Dead Man's Curve isn't a "do or die" event: it can, of course, be catastrophic but the range of seriousness also extends to just a "hard" landing.
Not sure about the gyro? If one is in the shaded area and you go down is that always a very bad result?
All things being equal (weight, main rotor blade profiles, etc.) the height velocity (HV) curves shouldn’t be different.
Note however that in determining the HV curve for helicopters, an intervention delay time of 1 or 2 seconds is assumed (time between the engine stopping, and the pilot lowering the collective to enter auto-rotation). Whereby the gyro plane already is in auto-rotation when the engine stops.
This, by definition, would create a bigger HV avoid area for a helicopter than for a comparable gyro plane.