Proboat Drive System: RD (Discontinued)

SKU PRB3656

The Jet propulsion unit, also known as a water-jet unit, is primarily fitted to exclusive high-speed motor yachts, ferries, racing boots and similar full-size vessels. In principle this power system consists of a pump which sucks in water though an opening in the bottom of the hull, accelerates it by means of an impeller, then forces it out again through an opening in the stern. Newton’s law of motion now applies: the jet of water expelled at the rear generates an equal and opposite reaction in the boat’s hull.

Boats with Jet propulsion units can operate in very shallow waters, as all the parts usually mounted below the hull, such as propeller, shaft, shaft bracket and rudder, are eliminated. Initial acceleration with a jet unit is very high, and this can be a distinct advantage in certain types of boat such as dragsters. The heeling moment produced by conventional boat propellers is completely absent. Since the water in a Jet propulsion system has to cover long distances in narrow ducts, there are inevitable friction losses which require rather more energy than for an orthodox power system.

This Mini-Jet is used in the Proboat duck Decoy, but can also be used for other small and medium-sized boats. It provides very accurate control in forward mode. All parts are injection-moulded in plastic except the shaft, which is of 3 mm diameter stainless steel. It is sealed at one end and runs in twin sintered bushes. Does not include the reversing flap or the motor coupling. Suitable for 380 sized electric motors.

Length approx. 105mm
Width max. approx. 28mm, Height approx. 28mm, Impeller 16mm


FRCB Tech Tip: This drive (one) will work nicely in any boat of about 12 to 24” length. It’s even better when used in pairs on Deep Vee hulls up to 24" long!

This item is DISCONTINUED. Contact us for possible alternatives.

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