as far as i know, the Osprey has vairable pitch, not a heli blade set up. very low pitch for take off, and high for forwards flight.
its hard and heavy to do this, but you can use fun fly props and electric motors for very good control. the original indoor helis had fixed pitch.
i can hang my planes very controled, and electric motors have even more control and responce. a propperly balanced set up should gently hover into the air. pilot skill will say how smooth this is
i'd imagine the real one controls pitch with subtle auto movements of the nacells. after all, it carrys troups, they mess the CofG up real good.
am i also right in saying it dosnt truely hover? rather tilts the rotors forwards slightly and STOL
thats solves a whole heap of problems