Abstract: The present invention relates to a gyroscopic stabilizer consisting of two interlocking wheels which comprise the field and armature of a synchronous electric motor. The wheels of equal mass and moments of inertia revolve about a common stationary shaft in opposite directions at the same rate of speed. The wheels interlock so that they may revolve relative to each other, but all other motion of one wheel relative to the other is prevented. The total angular momentum of the system is zero. In case of sudden destructive deceleration, no angular momentum is transferred to the stabilized object. Gyroscopic action of the wheels is maximized, and the nongyroscopic mass of the mechanism is minimized.