1) Thermal Propulsion: Uses an inert
propellant which is heated by a power source like nuclear or electric power and
drives it through a supersonic nozzle to create thrust. It’s specific impulse
is high but consumes a lot of fuel.
2) Chemical Propulsion: Powered by the exothermic reactions of the propellant. It is
3) Ion Drives: Creates thrust by
the acceleration of ions by electricity. These thrusters have very high
specific impulses and thus requires much less amount of fuel compared to
chemical or thermal propulsion systems.
it doesn’t produce a large amount of thrust and can only be used for
4) Solar Sail: Utilizes the
radiation pressure exerted by sunlight on large mirrors to generate thrust.
main advantage is that it does not use any form of fuel at all but relies
largely on solar power alone. But, like ion thrusters it produces a low amount
of thrust and the low availability of sunlight in Ganymede will pose a problem
to this system.
5) Thermal Fission: A fission reactor is
used to heat a propellant to extremely high temperatures and then passed through a nozzle to create
high thrust. Uncontrolled fission and
other risks of handling the fuel can
result in failure of the mission.
A monopropellant rocket utilizes a single chemical
compound as its propellant. Here, the energy needed for propulsion is obtained
from the exothermic reaction produced by the chemical compound. Hydrazine is
the most commonly used monopropellant. It is used in combination with granular
alumina catalyst. An igniter is not used for triggering the reaction. Instead,
the catalyst is mixed with Hydrazine which leads to a highly exothermic
reaction which produces a 1000?C gas which is a mixture of nitrogen, hydrogen
and ammonia producing the required thrust.A
combination of Ion Drive and chemical thruster can result in much lower
consumption of fuel thus reducing the mass of the whole spacecraft
considerably. The Ion Drive can be used for the long travel between Earth and
Ganymede and the thruster can be used for purposes which can’t be fulfilled by
the drive like sudden changes in trajectory