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Prop Guard® is a two piece plastic injection molded cage that will completely cover the propeller. The Prop Guard® is attached by a specially designed clamp system and bolts. The Prop Guard’s® two halves are attached like a clam shell to the cavitation plate and the skeg of any outboard or stern drive motor.

SKU: 900001


For over fifty years the same basic technology employed in the PROP GUARD® has been successfully usedworldwide by canal boats, river boats and commercial fishing vessels to achieve greater propeller thrust, plus substantial fuel savings. Now, after years of research and testing, these same benefits, plus much more, are available to pleasure boat owners at an unbelievably low cost!
The PROP GUARD® is a unique, U.S. and international patented propeller guard with no moving parts, no electrical wiring, and no hydraulic hoses. It can easily be installed in minutes with a few basic tools. The PROP GUARD® is manufactured to rigid specifications in state-of-the-art polypropylene.
PROP GUARD® is available for ALL Outboard and Stern Drive applications.
Prop Guard® is made to surround the propeller like a nozzle. This designed nozzle action moves water with a controlled directionalforce which gives the boat improved handling and more power. This nozzle action is accomplished with no movingparts to adjust or replace. Whether you have an outboard or stern drive, Prop Guard® will increase propeller efficiency, decrease fuel consumption and improve boat handling while reducing hull and engine stress. Technical testing of the Prop Guard® has proven that the performance of pleasure crafts are actually enhanced by the installation of the Prop Guard®.
How does the Prop Guard® increase propeller efficiency?
Optimum performance of any vessel is dependent upon the design match between the type of engine, its propulsion system and the type of hull. The delicate balance can easily be upset with an under powered or over powered engine. Even a perfectly welldesigned propeller may perform miserably if that propeller is placed behind an oversized or overloaded hull. Any problem with these elements can result in poor performance and handling for a vessel.
However, Prop Guard® , even with a technically unbalanced craft can increase the thrust of the propeller. The loss of kineticenergy due to rotational flow in the water downstream of the propeller can be partially recovered by the guide vanes of the Prop Guard® as it creates a counter rotation vortex, reducing the torque effect of the rotating propeller. The hydrofoil nozzle configuration of the Prop Guard® creates forward thrust, which overcomes its own drag and also provides an effective trim without drag.Nozzle propellers produce more thrust than open propellers as the nozzle produces greater dynamic lift for the boat and permits it to achieve faster acceleration and planing.
Prop Guard® eliminates the need for existing or additional drag producing trim devices. In a steep turn, boats tend to turnon their center of gravity and the propeller loses its bite in the water creating uncontrolled rev-ups, as the stern of a boat and the prop moves tangential to the center of gravity of the boat. This is eliminated as the greater lateral area of the nozzle produces a larger effective rudder area. Prop Guard® increases the thrust significantly to overcome handling problems.
How does the Prop Guard® increase boat handling?
In tests, vessels with Prop Guard® installed were put through tight figure 8 turns. The handling characteristics were greatly improved, as greater lateral area of the nozzle produces a larger effective rudder area. There is significantly greater steering control at high speeds, when the vessel made 360 degree turns in 30 to 40 feet compared to 60 to 80 feet with an unguarded propeller. The stopping ability of the boat is also dramatically increased as the nozzle presents a greater blockage area.
How does the Prop Guard® reduce hull and engine stress?
Prop Guard® allows a vessel with a planing or displacement hull to be trimmed so efficiently that porpoising or pounding of thehull can be greatly reduced. The fact of less pounding on the hull should reduce hull stress. When a boat is porpoising, sometimes the upper portion of the propeller will be in and out of the water allowing the engine to rev and release. The improved handling can also help reduce this type of engine stress.
How does the Prop Guard® make a vessel safer?
There are no “minor” propeller accidents. Installation of the Prop Guard® on all propellers would greatly reduce prop blade injuries to humans and marine life. The added thrust also allows for better handling control of the vessel. The Coast Guard, life guards and military vessels are preparing to order Prop Guards® because of the greater propeller safety factor and increased vessel control that they can achieve.
Prop Guard® is a two piece plastic injection molded cage that will completely cover the propeller. The Prop Guard® is attached by a specially designed clamp system and bolts. The Prop Guard’s® two halves are attached like a clam shell to the cavitation plate and the skeg of any outboard or stern drive motor. The easy installation can be accomplished by anyone with simple tools in about 20minutes.
How is the Prop Guard® different from other propeller guards?
The differences of the Prop Guard® over the current market propeller protectors are many. First, the Prop Guard® is made out of a light weight but strong, high impact, flexible injection molded plastic. This allows the guard to work without having the heavy weight and danger of the metal guards that are on the market today. Metal guards can corrode, and with a hard hit, the metal guard can be pushed into the propeller causing possible propeller damage. Besides propeller damage, the metal cage can break into metal fragments that could cause personal injuries and gear box damage.
The one major difference that the Prop Guard® has over any other guard is the Prop Guard® will improve the performance of the propeller. What this means is that if you can improve the efficiency of the propeller, you will improve the performance of the boat. The Prop Guard® is the only product not only designed to protect, but to improve the handling of a boat.

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