Steerable torque-balanced marine propulsion drive

Claim 1

A TORQUE-BALANCED STEERABLE MARINE PROPULSION DRIVE COMPRISING: A VESSEL STRUCTURE INCLUDING A PRIME MOVER DISPOSED THEREIN, A PROPELLER POD SUPPORTED BELOW SAID VESSEL STRUCTURE AND ROTATABLY MOUNTED FOR OSCILLATION ABOUT A VERTICAL AXIS, STEERING MEANS FOR OSCILLATING SAID PROPELLER POD RELATIVE TO THE VESSEL STRUCTURE, DIFFERENTIAL GEARING MEANS INCLUDING FIRST AND SECOND GEARS AND A CAGE DRIVEN BY SAID PRIME MOVER, SAID CAGE HAVING FREELY ROTATABLE PLANET GEARS DRIVING SAID FIRST AND SECOND GEARS IN THE SAME DIRECTION WHILE PROVIDING DIFFERENTIAL MOVEMENT THEREBETWEEN, REVERSING GEAR MEANS COUPLED TO SAID SECOND GEAR AND INCLUDING A THIRD GEAR DRIVEN IN THE REVERSE DIRECTION FROM SAID FIRST AND SECOND GEARS AT THE SAME ABSOLUTE SPEED AS THE FIRST GEAR, FIRST AND SECOND ROTATABLY JOURNALED COAXIAL SHAFT MEANS DRIVEN BY THE FIRST AND THIRD GEARS AND EXTENDING INTO THE PROPELLER POD, VERTICALLY SPACED FOURTH AND FIFTH BEVEL GEARS DISPOSED IN SAID POD AND CONNECTED TO SAID FIRST AND SECOND SHAFT MEANS RESPECTIVELY, AND A SIXTH BEVEL GEAR DRIVEN BY SAID FOURTH AND FIFTH BEVEL GEARS TOGETHER, WHEREBY COUPLES ABOUT THE POD VERTICAL AXIS CAUSED BY REACTIONS BETWEEN THE FOURTH AND FIFTH BEVEL GEARS WITH THE SIXTH BEVEL GEAR ARE BALANCED BY THE COUNTER-ROTATION OF SAID GEARS WHILE SAID DIFFERENTIAL GEARING MEANS PERMITS DIFFERENT SPEEDS OF SAID FIRST AND SECOND SHAFT MEANS AS THE POD IS OSCILLATED FOR STEERING.