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The capacity of jet engines is measured in thrust:

B747-400 with 4 American Pratt & Whitney PW4000: 4x 441 kN = 1764 kN

B747-400 with 4 BritishRolls-Royce RB211 4x 272kN = 1088 kN

In strictly technical terms, the engines on a Boeing 747 do not deliver any actual horsepower. Horsepower is a unit of applied power and thrust is a measurement of force. The thrust numbers presented above appear correct for thrust of the engines.

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This information should be available on the Boeing website or other avaition-related websites. For a quick answer, I will related my experiences from 1970's. Boeing certified the B747-200 to operate with General Electric CF6-50 engines. During take-off power, each GE engine could produce 56,000 lbs of thrust per enginer: or 224,000 lbs for a few minutes. Now, the larger B747-400 a/c have more powerful engines. Currently each engine on a Boeing 747-400 can generate a maximum of about 63,300 lbs of thrust. Accordingly, since this aircraft has four engines it can produce total thrust of about 253,000 lbs.


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