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A liquid rocket engine has fuel and oxidizer in liquid form, as opposed to a solid rocket or hybrid rocket or gaseous propellant.
Rockets are classified by the propellant used in their engines. The two main types of engines are solid fuel and liquid fuel. Liquid rockets are one of the major types of rocket. Liquids are mainly used rather than gases because of their high density, which permits high mass fractions, since the tankage is relatively light; tankage fractions of 100 can be achieved.
A liquid rocket could be monopropellant (using a single type of propellant), bipropellant (combining two types of propellants, such as hydrogen and oxygen) or tripropellant (using three types of propellant).
History
In the United States, liquid fuel rocketry was pioneered by Robert Goddard and his rocket, Nell (bipropellant, oxygen and gasoline).
External links
See also
"Liquid rocket"