Outboard engines for boats are getting more and more popular. Gradually they replace screw motors. This demand is due to the operational properties, as well as the unique characteristics of the units.
How the outboard motor works
An outboard water jet motor works in much the same way as a propeller. The cardan shaft is also present in this scheme. However, it now rotates not the propeller, but the impeller. This is a kind of impeller, thanks to which the pump starts to work and the main element of the system, which ensures the operation of the engine.
Thanks to the pump, water is quickly pumped into the motor, and then blown back more intensively. As a result, a reaction force appears. The boat simply pushes off the water and gradually moves forward. If necessary, the deflector can be switched on the engine. As a result, the water begins to be pumped in the opposite direction, due to which the vessel begins to move backward.
Benefits
The jet outboard motor has a number of advantages that distinguish it from a wide range of similarproducts. To understand the main advantages of these engine models, it is worth comparing them with screw systems. Among the main advantages of jet engines, it is worth highlighting:
- Strength and reliability. Sailing on a ship in reservoirs with a rocky and shallow bottom, as well as in shoals and shallow waters, leads to damage to the parts of screw engines. The jet outboard motor perfectly copes with any parts of the reservoirs 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 case and are closed with a special filtration grate. This helps 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.
- Safety of use. The jet outboard motor 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, when used, can hit the diver and cause severe harm to his he alth. The jet system is completely safe in this regard.
Flaws
A jet outboard motor, like any unit, has not only advantages, but also disadvantages, among which it is worth highlighting:
- Performance and power. A jet boat motor has less power than a propeller. This is due to the smaller impeller diameter than that of a conventional engine propeller. In addition, when workingscrew assembly, there is a high rate of turbulence. This also affects the power level. The difference of the last indicator is from 20 to 30%, and not in favor of the jet engine.
- Cost. This is another drawback that a jet outboard motor has. To significantly increase the power of the unit, manufacturers use power heads made of an expensive alloy. As a result, this significantly increases the cost of the jet engine.
Jet nozzles for outboard motors
What to do if a screw engine was already installed on the boat? In this case, you can use water jet nozzles. Similar accessories can be installed in those places where the propeller is attached, as well as the gearbox. Today, you can buy jet nozzles for almost any model of outboard engine, and even for those that have already served for more than one year. When choosing accessories, it is worth considering the design features of the units.
