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CHEMICAL
FUEL ENGINE
Hydrogen, Nitrogen, Oxygen and other chemical fuel engines are simple
liquid/gas fuel rockets, currently employed by less developed races.
Engines of this type were created by humans in the early 20th century,
and used for short range space flight.
On Earth, the first liquid engine rocket was test by Robert Goddard
in 1926 and used a combination of gasoline and liquid oxygen. The
basic concept behind liquid-propellant rocket is a simple one. The
vast majority of liquid rocket engines use a two-part stage consisting
of the actual liquid fuel and an oxidizer like liquid oxygen. The
two are pumped into a combustion chamber where they burn, thus creating
a great deal of pressure and expell a stream of hot gases at high-velocity.
These gases flow through a nozzle that accelerates them further
(5,000 to 10,000 mph exit velocities being typical), as they are
expelled from the engine bell.
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