What engine has the highest power/weight ratio ?

Answer:
 
 
Engine Characteristics (Fuel Turbopump)

Propellant: Liquid hydrogen
Speed: 36,200 rpm
Discharge pressure (max): 6,450 psi
Flow: 164 lb/sec (17,600 gpm)
Shaft horsepower: 76,000 hp
Turbine inlet temperature: 2,000º R
Service life: 60 missions
Design life: 240 missions

 

It’s 3 feet long and weighs 775 pounds = 98 hp / lb !

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