![]() In classical mechanics, instantaneous power is the limiting value of the average work done per unit time as the time interval Δ t approaches zero (i.e. ![]() The original liquid hydrogen turbopump is similar in size to an automobile engine (weighing approximately 352 kilograms (775 lb)) and produces 72,000 hp (54 MW) for a power-to-weight ratio of 153 kW/kg (93 hp/lb). For example, the Space Shuttle's main engines used turbopumps (machines consisting of a pump driven by a turbine engine) to feed the propellants (liquid oxygen and liquid hydrogen) into the engine's combustion chamber. This is because of their ability to operate at very high speeds. To see this, note that what an engineer means by the "power to weight ratio" of an electric motor is not infinite in a zero gravity environment.Ī typical turbocharged V8 diesel engine might have an engine power of 250 kW (340 hp) and a mass of 380 kg (840 lb), giving it a power-to-weight ratio of 0.65 kW/kg (0.40 hp/lb).Įxamples of high power-to-weight ratios can often be found in turbines. Weight in this context is a colloquial term for mass. The power-to-weight ratio (specific power) formula for an engine (power plant) is the power generated by the engine divided by the mass. Power-to-weight ratio is equal to thrust per unit mass multiplied by the velocity of any vehicle. 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 is often quoted by manufacturers at the peak value, but the actual value may vary in use and variations will affect performance. It is also used as a measurement of performance of a vehicle as a whole, with the engine's power output being divided by the weight (or mass) of the vehicle, to give a metric that is independent of the vehicle's size. Power-to-weight ratio is a measurement of actual performance of any engine or power source. Power-to-weight ratio ( PWR, also called specific power, or power-to-mass ratio) is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another. ( May 2021) ( Learn how and when to remove this template message) Please help improve it by removing references to unreliable sources where they are used inappropriately. This article may contain excessive or inappropriate references to self-published sources.
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