Mini Jet drive with reverse
With Jet propulsion, water is sucked in through openings in the fuselage and expelled at high pressure via a nozzle at the rear. The recoil principle accelerates the model to considerable speeds in a very short time.
A special feature is the high maneuverability for which a movable control nozzle is responsible. For the reverse drive, the water jet is deflected via a special flap, without having to reverse the direction of rotation of the shaft / motor.
In jet propulsion systems, neither the propeller nor the oars emerge from the hull - this makes it easy to drive on shallow water.
Our Mini-Jet 20 is suitable for small and medium model ships. The integrated 19 mm impeller is designed to be powered by a brushless motor. A servo is connected to the control nozzle and a second turns the reversing flap. The Mini Jet 20 would be made precisely from plastic. The stainless steel shaft is ball and sintered and sealed with a rubber ring.
Mini-Jet 20 mounted with control nozzle and reversing flap
Direct coupling 3 / 3.17 mm
mounting screws
Technical specifications
Total length approx. 128 mm
Width approx. 28 mm
Height about 36 mm
Flange diameter 32 mm
Impeller diameter 19 mm
Control nozzle diameter 14 mm
Shaft diameter 3 mm
Hole distance Motor mounting 19 mm
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.
