SINGLE-SCREW SHIP Russian patent published in 1995 - IPC

FIELD: shipbuilding. SUBSTANCE: arranged in stern counter of ship is propeller 1 after which suspended balanced rudder 2 having symmetrical profile is mounted. Fitted on blade of rudder 2 is circular hydrofoil 3 whose axis coincides with that of propeller 1. Wall of hydrofoil 3 has hydrofoil profile in longitudinal section. Outer diameter of hydrofoil 3 is equal to 1.07 to 1.15 and inner diameter is equal to 0.92 to 0.96 of diameter of propeller 1. Leading edge 5 of hydrofoil 3 is located at distance from disk of propeller 1 equal to 0.25 to 0.35 of diameter of propeller 1. Mounted inside hydrofoil 3 in plane of blade of rudder 2 is thin plate whose ends are rigidly secured to its inner surface; this plate has hydrofoil profile. Thickness of this plate is equal to 0.06 to 0.07 of diameter of propeller 1. EFFECT: enhanced reliability. 3 dwg