Roger that Nick, thanks. My helmet is now well and truly alight and getting worse! I am currently flying an AS350 so I will not be able to try your experiment safely just yet. I think I remember the Huey was specifically operated at 6600N2 so that when rotor bleed occured you were initially getting an increased effeciency from your rotor system, maxing out at about 6400N2, before getting less efficient. Any Huey drivers to clarify?
Nick, what happens to N1 in the situation you described. I had always thought it must increase in a bleed situation (along with resultant TGT increase) or are you simply refering to beep down rather than bleed due topping with N1, TGT, Fuel flow, etc?
How does the power/torque relationship effect the aircraft when the tail rotor slows? Is there any applicability of the Vsquared situation I was on about before?