Abstract: A line cutter 1 is fitted at a propeller 2 on a shaft 3 carried in a stern tube 4. Clamped to the shaft immediately in front of the propeller is a rotatable cutting blade unit 11 comprising a split hub 12, having two halves 121, 122, one of which carries one rotating blade 14 and the other of which carries two further blades 15. Bolts 16 clamp the halves to the shaft. A split collar 17 is clamped together and to the hub by bolts 17a at a machined groove 17b in the hub to provide a location groove 18 for a stationary cutting blade unit 21. This assembly has a single blade 22 integral with a half ring 23. A second half ring 24 is clipped by interlocking formations 23a, 23b to the first half ring. The two half rings are accommodated in the location groove 18, with the interposition of thrust washers 18a, 18b.

Abstract: A line cutter 1 is fitted at a propeller 2 on a shaft 3 carried in a stern tube 4. Clamped to the shaft immediately in front of the propeller is a rotatable cutting blade unit 11 comprising a split hub 12, having two halves 121, 122, one of which carries one rotating blade 14 and the other of which carries two further blades 15. Bolts 16 clamp the halves to the shaft. A split collar 17 is clamped together and to the hub by bolts 17a at a machined groove 17b in the hub to provide a location groove 18 for a stationary cutting blade unit 21. This assembly has a single blade 22 integral with a half ring 23. A second half ring 24 is clipped by interlocking formations 23a, 23b to the first half ring. The two half rings are accommodated in the location groove 18, with the interposition of thrust washers 18a,18b. The invention, the stationary blade 22 has a machined, circular cross-section spigot 25 extending forwards.

Abstract: A line cutting device for use with a hydrodynamic propeller has a blade (5) fixed to a vessel having the propeller. Three rotating blades (22) extend from a hub fixed around the propeller's shaft. The fixed and rotating blades are arranged for line shearing action. Each of the rotating blades has four apertures (21) extending from front to back through the blade for passage of water therethrough towards a respective blade of the propeller. The apertures are arranged to alleviate cavitation on the propeller blades.

Abstract: A line cutting device for use with a hydrodynamic propeller has a blade (5) fixed to a vessel having the propeller. Three rotating blades (22) extend from a hub fixed around the propeller's shaft. The fixed and rotating blades are arranged for line shearing action. Each of the rotating blades has four apertures (21) extending from front to back through the blade for passage of water therethrough towards a respective blade of the propeller. The apertures are arranged to alleviate cavitation on the propeller blades.