Power-to-weight ratio

<p>Power-to-weight ratio (PWR, also called specific power, or power-to-mass ratio) is a calculation commonly applied to <a href="/facts/Engine/p0m7aXaW">engines</a> and mobile power sources to enable the comparison of one unit or design to another. Power-to-weight ratio is a measurement of actual performance of any engine or power source. It is also used as a measurement of performance of a <a href="/facts/Vehicle/jSIEqANL">vehicle</a> as a whole, with the <a href="/facts/Engine_power/fPMMeyF7">engine's power output</a> being divided by the weight (or <a href="/facts/Mass/HHdc8XmF">mass</a>) of the vehicle, to give a metric that is independent of the vehicle's size. Power-to-weight is often quoted by manufacturers at the peak value, but the actual value may vary in use and variations will affect performance.
</p><p>The inverse of power-to-weight, weight-to-power ratio (power loading) is a calculation commonly applied to aircraft, cars, and vehicles in general, to enable the comparison of one vehicle's performance to another. Power-to-weight ratio is equal to thrust per unit mass multiplied by the velocity of any vehicle.
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Power-to-weight ratio open-in-new

Power-to-weight ratio