• OTHER: Flight Dynamics - Control - Twin Vertical Stabilizers THIS LOOKS BETTER. Twin booms will result in twin vertical stabilizers. They will give good directional authority in forward flight, but since they are side by side, they will give less resistance to yaw in hover. This may be better than the one above.
• OTHER: Aerodynamics - Variable Vertical Fin is a means of improving yaw control on intermeshing helicopters. Make mention of the ability to have Differential Longitudinal Cyclic. This method may reduce the need for such a large rudder on the Flettner, Kaman and Kellett helicopters.

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