Albert Wallen

US Patent:

40517993, Oct 4, 1977

Filed:

Jun 28, 1976

Appl. No.:

5/700675

Inventors:

Albert E. Wallen - Winston Salem NC
Paul L. Whitehead - Burlington NC

Assignee:

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

International Classification:

B63B 2100

US Classification:

114244

Abstract:

A depressing force in the form of negative lift is hydrodynamically generd on a towed underwater vehicle as a result of fluid in motion passing static fluid separated by a membrane so as to cause a negative pressure zone externally of the membrane. The external negative pressure enhances distension of the membrane into a water foil generating additional negative lift.

US Patent:

40300633, Jun 14, 1977

Filed:

Jul 28, 1976

Appl. No.:

5/709151

Inventors:

Albert E. Wallen - Winston-Salem NC

Assignee:

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

International Classification:

H04B 1300

US Classification:

340 8R

Abstract:

An underwater, ultra low frequency acoustic signal projector utilizes a pmatically powered signal generator wherein slide and poppet valves cooperate to effect pressure excursions on a piston connected to a water contacting signal generating piston. The generator is constantly pneumatically referenced to ambient hydrostatic pressures by a pressure equilibrium control system. A compressor recycles generator exhaust to provide substantially bubble free operation.