Similar to kerosene but highly refined. This is a liquid fuel
therefore it can be turned on and off as needed. This is burned
with liquid oxygen. Petroleum fuels the first stages of the Saturn
1B and Saturn V.
Cryogenic
Cryogenic fuels consist of liquid oxygen and liquid hydrogen.
Cryogenic fuels, unlike solid fuels can be stopped and started as
necessary. These fuels are stored at extremely low temperatures.
Cryogenic fuels are used on the second and third stages of the
Saturn V, the second stage of the Saturn 1B and on the main
engines of the Space Shuttle.
Hypergolic
Hypergolic fuels consist of monomethyl hydrazine and nitrogen
tetroxide. These fuels ignite on contact and therefore do not a
ignition source, they also can be stopped and started as
necessary.
Solid
Solid fuel consists of ammonium perchlaorate, iron oxidizer
powder and powdered aluminum. The fuel is bonded with an epoxy
curing agent, the epoxy also burns which adds thrust. Once a solid
fuel is ignited it continues to burn until the fuel is exhausted.
The Scout is the only rocket to use only solid fuel. The Titan,
Delta, and Space Shuttle all use a solid fuel for added thrust.
