Accession Number : ADD008457

Title :   Tunnel Wedge.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Hankley,Donald W

Report Date : 20 Nov 1980

Pagination or Media Count : 27

Abstract : A full or partial tunnel wedge is positioned in the propeller shaft tunnel aft of the propeller on a waterborne craft. The size and angle of the wedge is determined by the characteristics of the particular craft. The wedge converges water flow and increases water pressure aft of the propeller. The higher water pressure increases the propeller thrust and reduces the hull drag of the propeller shaft tunnel thus reducing the shaft horsepower required to maintain a given speed. (Author)

Descriptors :   *Patent applications, *Marine propellers, Wedges, Hydrodynamic control surfaces, Tunnels, Drive shafts, Water flow, Convergence, Thrust, Ramps, Angles, Drag reduction

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE