Liquid rocket
From Free net encyclopedia
A liquid rocket engine has fuel and oxidizer in liquid form, as opposed to a solid rocket or hybrid rocket. 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. As their name suggests, they use liquid fuel. The fuel components may vary, but two of the ingredients must remain the same.
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).