Propeller Mounted Ship Cutters

How Do They Work?

Spurs Line Cutter Systems use the propeller’s rotation and inertial force to power the cutting action. As the offending line enters the propeller vortex, it is wound toward the propeller hub. (NOTE: It is at this point that, without SPURS installed, the line would wind itself tighter and tighter, entering into the space between propeller hub and rope guard, where it can damage the oil seals.) Instead, the line is engaged by the rotating cutter blades and delivered to the stationary cutter blade. The sudden resistance sensed by the stationary cutter forces a cam action which causes the blade to be pushed outward, meeting the rotating blade and severing the obstruction.

The cutting force increases in direct proportion to the resistance sensed by the stationary cutter assembly. This shearing action means that the cutting blades never actually come into contact with each other. Hydrophilic and bronze surface bearings maintain precise cutter positioning when a resistance occurs. With each rotation, the cutters pass each other gliding on a thin lubricating film of water or within a few thousandths of each other, thus avoiding surface wear during long passages. The stationary cutter centers itself in the cutter guides as it passes through with each revolution of the propeller.

Propeller Mounted Systems

Cutter Systems

Until now, SPURS® has been well known for our Line, Net and Weed Cutters. Due to popular demand, we have developed the SPURS® SPACERS. The Spacers are installed between the transmission and shaft flanges to extend the shaft. The spacers are cold-rolled steel and nickel plated, tolerance .001 for all dimensions, and one inch thick (standard). Special orders can be made for thickness or size.

SPURS® manufactures cutter systems for fixed & variable pitch propeller and thruster systems.