"Bob" wrote in message ...
In the first instance, you are not "simulating" an autorotation; with no
engine OR no engine power applied to the rotor (throttle rolled off) you are
"performing" an autorotation. With the engine throttle left in a flight
position, the governor is GOVERNING rotor R.P.M. due to it's linkage to the
collective and the engine which is what under any circumstances what it
ACTUALLY GOVERNS, and ONLY THEREFORE can govern your rotor R.P.M.
SO...collective bottomed...engine "running", governor GOVERNS rotor R.P.M.
NO engine running (or no throttle applied) YOU govern rotor R.P.M. The
other variables you alluded to will include gross weight per fuel on board,
etc.
Bob

One pob = collective fully down to maintain rotor speed.
Two pob = collective not fully down to prevent overspeed.

If helicopter is heavier will not the coning angle be greater and
therefore the rotor speed higher because of less effective rotor
diameter. Hence the need to pull some collective at heavier weight to
slow blades and increase rotor disk diameter?

Or maybe I'm talking b****x! It has been known!!
Herbie