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Liquid rocket propellant
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The highest specific impulse chemical rockets use liquid propellants. They can consist of a single chemical or a mix of two chemicals, called bipropellants. Bipropellants can further be divided into two categories; hypergolic propellants, which ignite when the fuel and oxidizer make contact, and non-hypergolic propellants which require an ignition source.
Robert H. Goddard on March 16, 1926, holding the launching frame of the first liquid-fueled rocket
Friedrich Sander, Opel RAK technician August Becker and Opel employee Karl Treber (right to left) with liquid-fuel rocket-plane prototype at Opel Renn
Friedrich Sander, Opel RAK technician August Becker and Opel employee Karl Treber (right to left) with liquid-fuel rocket-plane prototype at Opel Rennbahn in Rüsselsheim
BE-4
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The Blue Engine 4 (BE-4) is an oxygen-rich liquefied-methane-fueled staged-combustion rocket engine produced by Blue Origin. The BE-4 was developed with private and public funding. The engine has been designed to produce 2.4 meganewtons (550,000 lbf) of thrust at sea level.
BE-4 on build stand
Blue Origin BE-4 rocket engine powerhead and combustion chamber, April 2018—liquified natural gas inlet side view. This was the first BE-4 engine to b
Blue Origin BE-4 rocket engine powerhead and combustion chamber, April 2018—liquified natural gas inlet side view. This was the first BE-4 engine to be hotfire tested; the test occurred on 18 October 2017.