Propeller Guard - RIB - Dinghy - Outboard - Boat Motors in BIBRA LAKE, Western Australia for sale

Prop guards for safety and increased performance
Can you put a price on safety
Sizes to suit 10hp up to 350hp - CALL RIB RESCUE NOW.
How does the Prop Guard® work?
Prop Guard® is made to surround the propeller like a nozzle. This designed nozzle action moves water with a controlled directional force which gives the boat improved handling and more power. This nozzle action is accomplished with no moving parts 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 well designed 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 kinetic energy 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 turn on 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 the hull 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.