outboard motors - outboard engines, attached to the hard transom boat.

Initially two engines were available. Their advantages - light weight, high power. But gradually their shortcomings, as improving the four motors, lead to a reduction in the number two. Easier startup, high efficiency, the price of fuel, increasing as improved technologies, specific power, these are the main reasons that cause the widespread transition to four-circuit.

The increasing requirements for environmental performance, an express prohibition on the use of engines combustion in some water bodies have led to the development of virtually noiseless outboard motors, powered by batteries or fuel cells.

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