Water Jet Motor: advantages and disadvantages

Pendant engines for boats deserve more and more popularity. Gradually they replace the screw motors. This demand is due to the operational properties, as well as the unique characteristics of the units.

Principle of operation of the outboard motor

The outboard water jet engine works almost the same as the screw engine. A cardan shaft is also present in this circuit. However, he does not rotate the screw, but the impeller. This is a kind of impeller, thanks to which the pump starts and the main element of the system that provides the engine operation.

Thanks to the pump, water is quickly pumped into the motor, and then more intensively blown back. As a result of this, a counteraction force appears. The boat simply repels from the water and gradually moves forward. If necessary, the engine can switch the deflector. As a result, the water begins to be pumped in the opposite direction, so that the ship starts to move back.

Benefits

The water-powered boat engine has a number of advantages that distinguish it among a wide range of such products. To understand the main advantages of these models of engines, it is worth comparing them to screw systems. Among the main advantages of jet engines are:

1. Strength and reliability. Walking on a ship in water reservoirs, where a stony and shallow bottom, as well as over shallows and shallows, leads to damage to parts of propeller engines. The water-jet boat engine copes with any parts of water bodies perfectly and at the same time its integrity is not violated. After all, all the operating elements of the system are located inside a sufficiently strong housing and covered with a special filter grid. This allows you to protect engine parts from damage. In addition, most of the components of modern models are made of high-strength alloys of titanium, aluminum and stainless steel.
2. Safety of use. The water-jet boat engine is designed so that the system is completely safe for everyone who is not only in the boat, but also in the pond. The screw engine during use can hurt the diver and cause severe damage to his health. The water-supply system in this regard is completely safe.

disadvantages

The water-powered boat engine, like any other unit, has not only advantages, but also drawbacks, among which is:

1. Performance and power. The water-powered boat engine has a lower power than the screw motor. This is due to the smaller diameter of the impeller than the working screw of a conventional motor. In addition, when the screw unit is operating, a high turbulence index is observed. This also affects the power level. The difference between the last indicator is from 20 to 30%, and not in favor of the water jet engine.
2. The cost. This is another drawback that a water jet boat has. To significantly increase the capacity of the unit, manufacturers use power heads made of expensive alloy. As a result, it significantly increases the cost of the water jet engine.

Water jet nozzles for outboard motors

What should I do if a screw engine has already been installed on the boat? In this case, you can use water jet nozzles. Such accessories can be installed in those places where the propeller is fastened , as well as the reducer. Today you can buy jet nozzles for almost any boat engine model and even for those that have already served more than one year. When choosing accessories, it is worth considering the design features of the units.