Rocket Groups

Rocket Groups - Energy conversion equipment onboard (heavy)...

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CHEMICAL vs. ELECTRIC ROCKET PROPULSION CHEMICAL Always thermal Energy / propellant initially together Energy source is combustion Energy limited Best propellants, Ue ~ 4,500 m/s Isp ~ 100-500 s Thrust ~ 0.1 N-10 MN Propellant and Energy decrease with time High Thrust, Low Isp, High mdot, Fast a o , Short t burn Thrust independent of t burn t burn ~O(seconds) Earth to orbit missions, low V ELECTRIC Some are thermal (resistojet, arcjet) Some are non-thermal (ion, hall effect, MPD) Energy source / propellant separate initially Energy source onboard or external Solar, Nuclear
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Unformatted text preview: Energy conversion equipment onboard (heavy) Unlimited energy Very high Ue (10,000-100,000 m/s) Isp ~ 1,000-10,000 s Thrust ~ N-N Propellant decreases with time Energy remains constant with time Low Thrust, High Isp, Low mdot, Slow a o , Long t burn Thrust inversely proportional to t burn t burn ~O(days-months-years) Station keeping, deep space exploration, high V Origin of Thrust: Eject Stored Mass Backwards Use Reaction Force to Propel Vehicle Rocket Equation is Always True...
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