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SPURS · Line and Net Cutters

SPURS is designed to prevent nets, ropes or other pollution from wrapping around the shaft and damaging the joints.

The rotational effect given by a moving propeller irreparably drives the nets and ropes that it catches towards the stern tube, creates a tightening and sliding which damages all the joints and causes, at least, leaks or structural damage, immobilizing the ship.

SPURS MODELS

SHAFT MOUNTED

INBOARD MOTOR VESSELS
For shaft from 20 to 255mm
3/4′′ to 10′′

PROPELLER MOUNTED

MEDIUM & LARGE VESSELS
For Shaft from 300mm or 12" to unlimited

TRANSMISSION SPACER

EXTEND THE TRANSMISSION SHAFT

ENVIRONMENTAL

With more ghost nets fl oating around the oceans, the possibility of wrapping net on your propeller increases daily.
Oil pollution caused by seal failure is your responsibility. With SPURS® protection, your vessel can cut lines and nets before entanglement to the propeller.
This avoids aft shaft seal rupture that can result in oil pollution, large monetary fines, costly repairs, and ship downtime.

FUAL CONSUMPTION

Line and nets are instantly cut before propeller entanglement. This allows props to run free, avoiding drag that occurs from line and net entanglement, obstructing water flow to the propeller and slowing the ship.

PROVEN

SPURS® has manufactured line and net cutter systems for well over 30 years and has now completed over 500 ship cutter system installations worldwide.
Razor-sharp Cutter Blade Systems are made of hardened stainless steel (17-4 pH). Each cutter blade is triple heat treated to bring the blade hardness to 46 on the Rockwell scale and provide stability under saltwater.

PEACE OF MIND

A demonstration cut is made prior to vessel undocking to verify cutter blade alignment and completion of Spurs Line & Net Cutter System installation.
The Oil Pollution Act of 1990 imposes heavy penalties for oil leaks. It also orders the Coast Guard to advise vessels to immediately secure the source of the leak. Protect your bottom line with SPURS®.
Don’t leave the dock without SPURS® protection!

THRUSTERS & PODS

Thrusters, Z-Drives and other propulsion components need the protection of Spurs®.
The most common repair on thrusters is seal damage and gear replacement, this is caused by excessive wear due to water intrusion. Guard against damaging thruster oil seals by installing Spurs® Cutter Systems.

Guard against damaging thruster oil seals by installing Spurs® Cutter Systems.

HOW DOES IT WORK ?

SHIP CUTTERS 

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.

SHAFT CUTTERS

Similar to the Propeller Mounted Systems, lines are wound down to the propeller hub and cut before the next revolution. However, the Shaft Mounted Systems is clamped on the shaft, riding on its inertial force with a blade hydroplaning on a Kevlar/Teflon bearing and is held stationary by a wedge holding block which is installed on the strut held by three screws.

SPURS LINE AND NET CUTTER SYSTEMS

Has been protecting vessels from costly propeller entanglement since 1981.
USED WORLDWIDE

USED WORLDWIDE

Installed on USCG, US Navy, Canadian CG, RNLI (English CG), Pilot Boats, and on over 100,000+ commercial and pleasure vessels worldwide.
GLOBAL NAVIGATION

GLOBAL NAVIGATION

Is now made safer with Spurs Cutter Systems installed on your vessel.

Spurs Contact Form

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Shaft Mounted Boat Informations

Spurs Measure Requirement

(Note: confirm both port and starboard are the same)

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SHAFT MOUNTED CUTTER SYSTEMS

The principle that enables the shaft mounted “SPURS” to cut so effectively is the “screw action” created as the propeller turns, winding lines, nets or weeds directly into “SPURS” blades, for an instant cut eliminating entanglement and damage to the running gear.

  • Cuts lines, weeds, and nets.
  • Eliminates dives to cut prop-fouling lines in freezing or high seas.
  • No more costly commercial “down time” for repairs.
  • Prevents the need for Coast Guard towing or expensive commercial towing.
  • No more shafts or struts torn loose that can sink your vessel.
  • Avoid expensive haul-outs, dry-docking, and diver’s charges.
  • Prevent burnt bearings and engine overload repairs.
  • Cuts line with each revolution (forward or reverse), with no loss of speed or efficiency.
  • Fits shaft sizes 3/4″ to 10″. (Metric sizes 20mm-255mm)
  • Made of hardened stainless steel.
  • Don’t leave the dock without “SPURS” protection!

PROPELLER MOUNTED SYSTEMS

Our propeller mounted systems are meant for medium to large vessels. They instantly cut lines and nets before they become entangled. This prevents aft seal rupture, resulting oil pollution and other costly damage to your vessel.

  • Protect against fishing nets and trap lines
  • Prevent damaged oil seals
  • Prevents the need for Coast Guard towing or expensive commercial towing.
  • Avoid expensive haul-outs, dry-docking, and diver’s charges.
  • Made of hardened stainless steel.
  • Don’t leave the dock without “SPURS”protection!
  • For propeller hub sizes from 12″ (300MM) and larger

TRANSMISSION SPACER

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.

  • Installing Spurs Shaft Mounted Cutter Systems
  • Shaft Alignments
  • Replacing Drive Savers
  • Propeller Replacement (short to full hub)
  • Shaft Extension
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