In other words, the "'propellant mass fraction "'is the ratio between the propellant mass and the initial mass of the vehicle.
12.
It is spin stabilized at 40 rpm and the propellant mass can be reduced by up to eight months before launch or up to on the launch site.
13.
Too low exhaust velocity would excessively increase propellant mass needed under the rocket equation, with too high a fraction of energy going into accelerating propellant not used yet.
14.
A "'rocket engine "'is a type of jet engine that uses only stored rocket propellant mass for forming its high speed propulsive jet.
15.
The hydrogen is heated by the fusion plasma debris to increase thrust, at a cost of reduced exhaust velocity ( 348 463 km / s ) and hence increased propellant mass.
16.
Propulsion systems based on electrodeless plasma thrusters seem ideally suited for orbit raising for large geostationary satellites, and would also be able to perform orbital stationkeeping, hence enabling important propellant mass savings.
17.
A rocket employing staging, which are the only designs to have reached orbit, has a mass fraction higher than the propellant mass fraction because parts of the rocket itself are dropped off en route.
18.
However, if the nuclear core is pulsed, thrust may be amplified n-times by amplifying the power n-times and the propellant mass flow n-times and keeping constant the exhaust velocity.
19.
For any given specific power, with a large v _ { e } which is desirable to save propellant mass, it turns out that the maximum acceleration is inversely proportional to v _ { e }.
20.
For a chemical rocket the propellant mass therefore would include both fuel and oxidizer; for air-breathing engines only the mass of the fuel is counted, not the mass of air passing through the engine.
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