n5296s
Nope, not at all, but if you read the op's original statement, there are no bounds or qualifications set, making it a black and white situation so the question is linear in nature.
ie, If a definitive unqualified statement is made that is not true in all circumstances, then it is a false statement.
"Now, I have absolutely no idea WHY the rotor is more efficient at higher alpha "
That is simple. It's just like being "on the buffet" in a fixed wing.
The lift/drag relationship is at its best just before the stall, which increases the efficiency of the autorotative effect etc, just like its the best turn AoA for a fighter.
Last edited by Tourist; 12th May 2012 at 11:17.