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CHURCHILL BI-LIQUID SERIES OF ENGINES
A bi-liquid rocket engine uses a liquid oxidiser and a liquid fuel, which are mixed and ignited in the combustion chamber.

Pros:
  MK.III MK.II
MK.I
Propellants Liquid Liquid Liquid
Fuel Kerosene Kerosene Kerosene
Oxidiser Liquid oxygen Liquid oxygen Liquid oxygen
Thrust (sea-level) 15000 Kg (33075 lbf) 3000 Kg (6615 lbf) 500 Kg (1102 lbf)
Chamber Pressure 300 psi 300 psi 300 psi
Specific Impulse 230 seconds 230 seconds 230 seconds
Feed System Pressure fed Pressure fed Pressure fed
Pressurant Gas Helium Nitrogen / Gaseous Oxygen Nitrogen / Gaseous Oxygen
Cooling Method(s) Regenerative & Film Cooled Regenerative & Film Cooled
Regenerative & Film Cooled
Churchhill
Churchill Specifications, Mk.I, Mk.II, and Mk.III
Liquid engines offer much greater performance and flexibility than solid motors.
They can be stopped, restarted and throttled.
Cons:
They are however considerably more complicated, featuring a certain amount of high pressure plumbing and, depending on the specific design, moving parts.
It is this type of system that is most common and was also used to put man on the moon.



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