* Early 747s used Pratt & Whitney JT9D engines, which have a takeoff thrust of around 50,000 pounds and a horsepower rating of approximately 50,000 hp at takeoff.
* Later 747-400 models use General Electric CF6-80C2 engines, which have a takeoff thrust of around 56,000 pounds and a horsepower rating of approximately 56,000 hp at takeoff.
* The 747-8 uses General Electric GEnx engines, which have a takeoff thrust of around 66,000 pounds and a horsepower rating of approximately 66,000 hp at takeoff.
It's important to note:
* Horsepower is not a standard unit of measurement for jet engines. Jet engine power is typically measured in thrust, which is the force that propels the aircraft forward.
* The horsepower rating of a jet engine is not a constant value, as it varies with the engine's operating conditions, such as altitude, airspeed, and temperature.
Therefore, it's more accurate to refer to the thrust of a jet engine, rather than its horsepower.
