Patent ID: 7527011

Claim:
A propulsion means for transporting a diver using a scuba tank containing pressurized air comprising: a towing device including a pressurizable reservoir, said towing device includes a dual cylinder compound motor powered from said scuba tank containing pressurized air, said dual cylinder compound motor includes a small piston operating within a small cylinder and a large piston operating within a large cylinder, a linkage means interconnecting said small piston and said large piston so one piston is urged to return as the other piston thrusts forward, said dual cylinder compound motor is attached to a dual paddle and flapper valve water thrusting means which propels said towing device, a breathing means capable of supplying sufficient diver breathing air is plumbed to said pressurizable reservoir, said breathing means utilizes air that has previously powered said dual cylinder compound motor whereby almost no air from said scuba tank containing pressurized air is wasted from powering said dual cylinder compound motor.