Is it possible to use big gyroscopes to directly control yaw, pitch and rotation of aircraft? Let's make the assumption that the system must be able to produce a specific moment (force couple) for an arbitrary length of time, without the power necessary to do so increasing. An example application could be to counteract the aerodynamic pitching moment from a wing, without using a tail. My guess is that it is impossible to achieve what I've described above, but I have no proof. (1) If gyroscopes had the ability to simply resist rotation along rotation-vectors perpendicular to their axies of rotation, one could put a pack of three perpendicular gyroscopes in the center of the plane, and then rotate the aircraft by turning this gyro-pack around in a calculated manner. think three pairwise perpendicular gyroscopes spinning at the same rate would just cancel out, and would show no gyroscopic effects. (2) Can anyone prove or give a counterexample for either of statements (1) and (2)?