MPT Thrustor 19.50" Prop Guard

19.5" MPT Aluminum Thrustor for 250hp to 440hp Mercury & Konrad Bravo-2 fitments.

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• Prop Diameter Range : 17.25" to 18.50"
• 1" Prop Tip Clearance Recommended
• MPT Thrustor Material: Akadized Aluminum
• Stainless Mounting Hardware Included
• Easily mounts to 250-440hp Konrad, Yanmar and Mercruiser Bravo-2 Sterndrives.

Each “Multiple Nozzle” assembly consists of two or more hydro-dynamically shaped nozzles with “Venturi” ports between the nozzles that draft outside ambient water to the propeller. A directional column of propeller thrust is created that substantially improves the operating performance, maneuverability and stability of any vessel equipped with the System. Stern lift and dramatic rudder control are generated with the Thrustor.

The Venturi action that is created by the multiple nozzle system adds water and atmospheric pressure to the column formed by the nozzles, reducing propeller cavitation and increasing the gallons per minute discharge, adding to forward thrust, via the kinetic discharge and hydrofoil acceleration.

For over 50 years, a wide variety of propeller guard designs have been developed with the idea of protecting water sport enthusiasts from injury and deaths caused by propeller strikes, as well as capsized and over-the-side incidents. During this period most of the designs presented to the market have resulted in a significant decrease in vessel performance.

Although the MPT prime objectives are to deliver ecological and safety benefits, when Mr. Schultz and Mr. Smith developed the Thrustor and Schultz Nozzle™ technology, their design objective was to create a system that would also address vessel performance.

Performance Benefits

In all categories the patented MPT Thrustor system has added a dimension of functionality to hull control and vessel stability (pitch, yaw and roll) previously NOT CONSIDERED POSSIBLE. This unprecedented advancement dramatically increases the vessel’s operational abilities, improves habitability and overall safety… especially during challenging wind and surface conditions.

The MPT Thrustor assisted drives have the added dynamics of ten to twenty-four lineal feet of hydrofoils surrounding the propeller, creating stern lift, 3 axis trim and directional control of the hull that far exceeds the physical capabilities of any open propeller drive. The multi-nozzle system mitigates chining of the vessel.

The “ hole shot” in all categories is faster and maintains visibility over bows. The towing and directional thrust is increased, with the US Navy reporting a 230% increase in speed with a heavy tow and maintaining their 30kt + cruising speed.

Improved seakeeping and habitability: In any weather, sea states 2 and above, Thrustor® assisted drives have proven to be a faster, smoother and safer ride. Personnel can count on more platform stability for a successful mission and return.

The sea trials verify that the Thrustor® mitigates propeller cavitation vibration in all categories of vessels (the deck goes quiet, no vibration), predicting a longer life to the gear train, electrical instrumentation and other support systems.

As a propeller guard the Thrustor has far exceeded the expected strength, and the load increase that can be carried. The skeg mount, or skeg lock, integrates the system to the cavitation plate, creating a structure that will support the transom weight of most outboard and stern drive boats, while also shrouding and protecting the propeller.

Ecological Benefits

It is anticipated that the patented technology will provide the following ecological and safety benefits.

Reduction of Fuel consumption at cruising speeds due to lower required RPM.

On small craft at a 3500 Cruising RPM, preliminary Thrustor® testing resulted in speed increase of 5% or a reduction of up to 300 RPM to maintain the same speed, which will result in additional fuel savings of 5%.

Since the 1930’s the Kort Nozzle at low speeds up to 9 knots, has a proven track record of delivering a 30% increase in Bollard pulling power, or a 30% fuel savings for displacement hull vessels under 10 knots.

The Schultz Nozzle™ speed threshold will exceed the hull speed of all commercial vessels; it is the only nozzle system that will work on vessels above 10 knots. We anticipate a minimum 5% fuel savings for all higher speed commercial vessels.

Reduces Hydro Carbon emissions by decreasing fuel consumption.

A reduction in cavitation vibration reduces potentially dangerous sound frequencies to sea life. These negative effects on sea life are currently under serious study.

Narrows the normally disruptive 360 degree propeller wash into a tight, directional thrust towards the rear which:
Protects fish/egg habitat

Protects shallow-water plant habitat

Reduces beach erosion caused by normal prop wash

Safety Benefits

Reduces propeller strike injury to mammals, especially manatees.

Reduces chances of a propeller strike to persons engaged in diving or water sports activities.

Increases planing hull control, thus reducing over-the-side and capsizing incidents.