Excuse me, why do some of the engines behind the speedboat spray a small column of water into the air?
The upstairs answer was completely wrong. Don't know don't guess right?The boat behind the engine is called an outboard engine, the cooling system of outboard machine is water cooled, the small jets of water from the machine is under water pumping up the circulating water after cooling the engine spray.
In addition, there is a water motorboat that rolls up a very high column at the rear. That's the unique design of YAMAHA's motorboat. It's for dazzle.
Its function is very direct to be seen by the user. If you start to see the outboard machine after the jets of water cooling system, that is a problem, immediately turn off the check, otherwise the engine without high temperature alarm device is easy to cause serious damage.
The propulsion of the speedboat is accomplished by the rotation of the propeller of the engine behind the boat. When the propeller rotates in the water, the thrust of the water supply and the reaction force of the water push the boat forward. The propeller speed is fast, the thrust force of the water supply is large, and the speed of the speedboat runs quickly. Because the propeller does not rotate deep in the water, and the thrust is reversed horizontally, some of the water that is thrust by the propeller will break away from the surface of the water and is sprayed far into the water column.
