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To the question whether 15 horsepower is sufficient for this boat, there is only one thing to say: A power reserve is required for open water. Why a power reserve is needed. First of all, to get to the point as quickly as possible. If with this motor at maximum speed the speed is 33 km/h, then with a 25 horsepower motor it will be 40-45. You can go without straining yourself at about 40 km/h and the motor will whisper, and not strain at maximum speed. Although all motors easily withstand maximum speed. When loaded and rough seas with a weak motor, you cannot overcome the forces of resistance and reverse thrust of the wave. You open the damper completely, and the motor roars, and this is no longer good for the equipment. In calm water this is not so critical. • REEF 390 НДНД+ Hidea 9.9 About power...