Power-to-weight ratio Totally Explained

Everything about Power To Weight Ratio totally explained

Power-to-weight ratio (specific power) is a calculation commonly applied to engines and other mobile power plants 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 plant.

Power to weight (specific power)

The power-to-weight ratio (Specific Power) formula for an engine (power plant) is the power generated by the engine divided by weight of the engine as follows:
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English system units of measure are usually pounds per horsepower (lb/hp)
Metric system units of measure are usually kilograms per horsepower (kg/hp)
The use of watts, or kW (kilowatts), instead of horsepower is common (Conversion: 745.7 watts/hp).

Examples

Because this is a ratio, the denominator is always singular (1 hp or 1 kW) as in the following examples. Note: When looking at weight-to-power ratio (power loading), smaller is better.

2007 Chevy Malibu Is, 5 seats

3,122 lb (automobile weight)/145 hp (V6 (cyl) engine power) = 21.5 lb/hp 432 lbs x 10/67

Cessna 172 airplane, 4 seats

2,450 lb (aircraft weight)/160 hp (H4 (cyl) engine power) = 15.3 lb/hp (9.25 kg/kW)

Further Information

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