Michael Francis Demarco

US Patent:

46093621, Sep 2, 1986

Filed:

Jul 5, 1983

Appl. No.:

6/510539

Inventors:

Michael DeMarco - Middletown RI

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F42B 1901

US Classification:

440 75

Abstract:

The system provides propulsion of an underwater vehicle without the need noise producing gears or internal combustion engines. Variable speed of two impellers is automatically controlled from a single hydraulic piston regardless of depth, as is the horizontal and vertical attitude. Upright stability of the vehicle is held by controlling the speed of one impeller versus the other also using a single hydraulic piston. Since the speed controlling element allows output speed adjustments from zero to maximum, efficiency of the battery powered prime mover is high. The motor is allowed to come up to full high operational speed under no load conditions (zero output speed) developing vast amounts of kinetic energy through centrifugally forced contact rollers. This energy becomes available for the supply of peak power without taxing the prime mover, while continuing to reestablish the spent kinetic energy during periods of low power output. The system is suitable for utilizing digital control inputs that can feasibly be supplied by radio control through an antenna external to the system.

US Patent:

44111720, Oct 25, 1983

Filed:

Feb 20, 1981

Appl. No.:

6/236478

Inventors:

Michael DeMarco - Middletown RI

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F16H 3706

US Classification:

74690

Abstract:

Propulsion means of an undersea vehicle comprises a pair of counter-rotat low speed impellers driven from a spider shaft rotating at relatively high speed. The reduction is accomplished by a variable speed reducing and torque transmitting device which allows infinite resolution for speed control including a zero speed setting while maintaining a constant high speed at the input spider shaft. Attitude of the vehicle is controlled by a plurality of regulated inlet ports and roll control is regulated by increasing the speed of one impeller and decreasing the speed of the other. The sea water utilized for the attitude is also used for propulsion. Control systems within the vehicle utilize an electro-pneumatic-hydraulic system complex.

US Patent:

43603483, Nov 23, 1982

Filed:

Feb 20, 1981

Appl. No.:

6/236476

Inventors:

Michael DeMarco - Middletown RI

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F42B 1901

US Classification:

440 67

Abstract:

Propulsion apparatus for an undersea vehicle comprises a pair of counter-ating low speed impellers driven from a spider shaft rotating at relatively high speed. The reduction is accomplished by a variable speed reducing and torque transmitting device which allows infinite resolution for speed control including a zero speed setting while maintaining a constant high speed at the input spider shaft. Attitude of the vehicle is controlled by a plurality of regulated inlet ports and roll control is regulated by increasing the speed of one impeller and decreasing the speed of the other. The sea water utilized for the attitude is also used for propulsion. Control systems within the vehicle utilize an electro-pneumatic-hydraulic system complex.