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A horsepower-hour (symbol: hp⋅h) is an outdated unit of energy, not used in the International System of Units.The unit represents an amount of work a horse is supposed capable of delivering during an hour (1 horsepower integrated over a time interval of an hour).
For example, Concorde cruised at 1354 mph, or 7.15 million feet per hour, with its engines giving an SFC of 1.195 lb/(lbf·h) (see below); this means the engines transferred 5.98 million foot pounds per pound of fuel (17.9 MJ/kg), equivalent to an SFC of 0.50 lb/(lbf·h) for a subsonic aircraft flying at 570 mph, which would be better than even ...
This formula may also be used to calculate the power of a jet engine, using the speed of the jet and the thrust required to maintain that speed. Example: how much power is generated with a thrust of 4000 pounds at 400 miles per hour? {} = =
In the example provided by the US DoE in its final rule, an electric car with an energy consumption of 265 Watt hour per mile in urban driving, and 220 Watt hour per mile in highway driving, results in a petroleum-equivalent fuel economy of 335.24 miles per gallon, based on a driving schedule factor of 55 percent urban, and 45 percent highway ...
Two-seater and four-seater flying at 250 km/h with old generation engines can burn 25 to 40 litres per flight hour, 3 to 5 litres per 100 passenger km. The Sikorsky S-76 C++ twin turbine helicopter gets about 1.65 mpg ‑US (143 L/100 km; 1.98 mpg ‑imp ) at 140 knots (260 km/h; 160 mph) and carries 12 for about 19.8 passenger-miles per gallon ...
Car longevity is of interest to many car owners [1] and includes several things: maximum service life in either mileage or time (duration), relationship of components to this lifespan, identification of factors that might afford control in extending the lifespan. Barring an accidental end to the lifespan, a car would have a life constrained by ...
Turboprops have an optimum speed below 460 miles per hour (740 km/h). [15] This is less than jets used by major airlines today, however propeller planes are much more efficient. [16] [need quotation to verify] The Bombardier Dash 8 Q400 turboprop is used for this reason as a regional airliner. [17] [18] [verification needed]
Specifically, for driving at an average of 60 kilometres per hour (37 mph), approximately 33% of the energy goes into exhaust and 29% is used to cool the engine; engine friction takes another 11%. The remaining 21% is split between rolling friction of tires (11%), air drag (5%), and braking (5%). [ 6 ]