[Flieger]

Originally Posted by aschen

Osprey should be able to yaw with differential torque in the two engines. I'm not sure if they do that though

Good point. But that would couple the yaw and roll like wing dihedral. Maybe by varying the pitch of the props so that they have equal lifting power but one putting out more torque? But that doesn't sound like something a turbine engine would do- more like a piston engine.