Originally Posted by
ShyTorque
a) I'm not familiar with the term ROM%
b) Did anyone assume it wouldn't work in autorotation? I certainly didn't. However, the tail rotor would still absorb a lot of energy even in autorotation so presumably its electrical power generator would need to be driven by the main rotor transmission, or a very large capacity battery would be required if engine driven generators no longer provided electrical power.
Presumably you could get away from powering an electric tail rotor all the way down in autorotation until just before the flare when it's time to spool it back up again to assist a little later with the run on...