To: Capn Notarious
I'm waiting for Lu's response.
It would seem that on the model helicopter there is a great deal of flexibility in the drive line and with a low level of inertia in the dynamic system the model helicopter can tolerate the acceleration and deceleration of the blades. However on a full size helicopter the inertia of the blades and rotorhead is quite large. The constant acceleration and deceleration of the main rotor would manifest itself in torsional windup of the rotor mast and further manifest itself in overstressing the internal workings of the transmission. These same loads would also be reflected in the attachment of the transmission to the fuselage requiring a special vibration damping system such as elastomeric couplings.
The tail rotor driveline would be subjected to the same torsional windup but at a higher frequency resulting in overstress of the shaft, couplings and the tail rotor and tail rotor gearbox.
