Rotorspeed: why do you need to be inside the dead mans curve to do an OGE check?
Find out the height you need to be at (for your helo) to stay outside the H/V curve and then check your HOGE? Simples.
Advertising the possible use of the dead man's curve is not good karma for newbie's popping in for lunch now, is it? Wifey's prada handbag could get squashed in the subsequent forced landing