IFMU,
Thanks. The incomplete algorithm has been removed.
"The main rotor will be slowed during high speed flight to keep the rotor tips below supersonic speeds."
Strange.
It makes sense for a compound helicopter, such as
the Piasecki, to have a higher RRPM in hover than in cruise since the rotor will off-load some of its lift to the wings during cruise. However, the Advancing Blade Concept does not have wings.
On the X2, The propeller will provide the forward thrust. The rotor is responsible for lift and this lift will not vary much between hover and level forward flight. Therefore, wide chords and slowed rotors should be ideal for all modes of flight.
The single speed should also reduce the weight and complexity of the transmission.
Dave