to rotate relative to rotor 20 attached to rotor 20 via a canard frame 21 are a pair of fixed canards 30 when the shell is fired from a gun the main housing 14 spins at the rate the shell is spinning while the air stream acts against the fixed canards 30 and a set of deflecting canards 40 to despin rotor 20 down to essentially zero rpm in practice rotor 20 is actually made to spin in the opposite direction at a few rpm to cause the fixed canards to rotate in a direction opposite that of the main housing at a few rpm a slight cant is put into the fixed canards on the order of less than one degree bearings 24 and 26 permit the relative motion between the rotors 20 and 22 and the main housing 14 and thus the spinning shell the shaft of rotor 22 has a cam surface 32 thereon which cooperates with a cam follower coupling pins 34 and 36 these pins are attached to a yoke having a pair of deflecting canards 40 mounted thereon in the example shown the pins are spaced 180 degrees apart yoke 38 has a pair of shafts 39 attached thereto which ride in a corresponding pair of bearings 41 these bearings are.