Anti-cavitation tunnel for marine propellers
OwnerGeoffrey David Saundersinventor
Life of this patent
Estimating the term…
Abstract
An anti-cavitation tunnel (11) for a watercraft (20) has a non-convergent, plain (ie., non-aerofoil) section cowling (12) with a leading edge (13) located in or forwardly of a plane including the leading edges of the blades (28) of the propeller (25) and a trailing edge (14) which is located forwardly of the rearmost points (27) of the blades (28) of the propeller (25).
Claims16
(amended) an anti-cavitation tunnel for a propellor of a watercraft, said anti-cavitation tunnel comprising:
- a cowling, non-convergent along its length and of plain (non-aerofoil) section, having a leading edge and a trailing edge wherein the leading edge of the cowling is substantially located in, or rearwardly of, the plane including the anterior surface of the propellor, the trailing edge of the cowling is substantially located in, or forwardly of, the plane including the posterior surface of the propellor, and the maximum distance between the leading edge and the trailing edge of the cowling is less than the maximum fore and aft length of a vane of the propellor.
(Amended) An anti-cavitation tunnel for use with a propellor of a watercraft, said anti-cavitation tunnel comprising:
- a cowling, non-convergent along its length and of plain (non-aerofoil) section, having a leading edge and a trailing edge;
- and
- attachment means for securing the cowling in an operating position in relation to the propellor;
- wherein the leading edge of the cowling is substantially located in, or rearwardly of, the plane including the anterior surface of the propellor, the trailing edge of the cowling is substantially located in, or forwardly of, the plane including the posterior surface of the propellor, and the maximum distance between the leading edge and the trailing edge of the cowling is less than the maximum fore and aft length of a vane of the propellor.
(New) An anti-cavitation tunnel for a propellor of a watercraft, said anti-cavitation tunnel comprising:
- a cowling, non-convergent along its length and of plain (non-aerofoil) section, having a leading edge and a trailing edge wherein the leading edge of the cowling is substantially located in, or rearwardly of, the plane including the anterior surface of the propellor and the maximum distance between the leading edge and the trailing edge of the cowling is less than the maximum fore and aft length of a vane of the propellor;
- wherein:
- the lower portion of the cowling encloses approximately one-half to three-quarters of the length of the propellor and an upper portion of the cowling encloses substantially all of the top of the propellor and tapers down to enclose approximately one-half to three-quarters of the propellor.
(New) An anti-cavitation tunnel for use with a propellor of a watercraft, said anti-cavitation tunnel comprising:
- a cowling, non-convergent along its length and of plain (non-aerofoil) section, having a leading edge and a trailing edge;
- and
- attachment means for securing the cowling in an operating position in relation to the propellor;
- wherein the leading edge of the cowling is substantially located in, or rearwardly of, the plane including the anterior surface of the propellor, and the maximum distance between the leading edge and the trailing edge of the cowling is less than the maximum fore and aft length of a vane of the propellor;
- and wherein:
- the lower portion of the cowling encloses approximately one-half to three-quarters of the length of the propellor and an upper portion of the cowling encloses substantially all of the top of the propellor and tapers down to enclose approximately one-half to three-quarters of the propellor.
Dependencies are inferred from the claim text.