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US 4,288,223 AGranted
Tubular duct for a ship propeller
AssigneeAstilleros Espanoles, S.A.
InventorsRamon R. Gonzalez, Gonzalo P. Gomez
Life of this patent
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Abstract
A tubular duct is provided for ship propellers with blade tips having barrier plates extending transversely therefrom. The tubular ducts are effectively arranged to extend the barrier plates in a manner which, in operation, directs a fluid stream in substantially shock-free contact with such plates.
Claims12
A combination of a ship propeller in juxtaposition with a non-rotating tubular duct,
- the propeller having an axis, a diameter and a plurality of blades, each blade having (a) a tip radius, (b) a fixed plate and (c) a back or suction side,
- the tubular duct (d) being coaxial with and displaced from said propeller and on the back or suction side thereof, (e) effectively comprising means to extend a geometric figure generated (by a cross-section of an axial plane, through the tip radius of a blade, with the fixed plate) on rotation of said fixed plate about the axis, (f) having an internal radius at a point adjacent to the fixed plate which is approximately that of the geometric figure at a point which is closest to said duct, (g) providing means to direct fluid toward said back or suction side of said propeller and (h) having a length at its shortest point which is at least 20 percent and at most 2 times that of the diameter.
Dependencies are inferred from the claim text.