# 37 (kW or 50 hp outboard motor)

 50 HP MARINER 4 STROKE 6490

Image from Apollo Duck

Among the many ways that power can be described are in horsepower (hp), watts (W) or kilowatts (kW).  Horsepower is used more often to describe mechanical energy.

From WhatIs.com: “A power level of 1 hp is approximately equivalent to 746 watts (W) or 0.746 kilowatts (kW). To convert from horsepower to watts, multiply by 746. To convert from watts to horsepower, multiply by 0.00134. To convert from horsepower to kilowatts, multiply by 0.746. To convert from kilowatts to horsepower, multiply by 1.34.

“While the horsepower, the watt, and the kilowatt are all reducible to the same dimensional units (they each represent a certain rate of energy expenditure, or power), the horsepower is rarely used to express power in any form other than mechanical. You will likely get raised eyebrows if you talk about a 1-hp microwave oven, just as you would feel uncomfortable talking about a 37-kW outboard motor.”  Or rather 50 hp outboard motor.