Questions tagged [advanced-propulsion]

Questions on spacecraft propulsion techniques that are either theoretical or not yet at a high technology readiness level.

8 questions with no upvoted or accepted answers
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What aerothermal effects present significant challenges in supersonic retropropulsion?

One of NASA's plans for future mars entry, descent and landing missions includes an ambitious deceleration process involving retropropulsion in a supersonic airflow environment. I know that previous ...
4
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0answers
110 views

Electromagnetic engines in heavy radiation regions

What sorts of peculiarities might affect an electromagnetic rocket (VASIMR or Magneto-Inertial Fusion) crossing Jupiter's radiation belts? Could all of that energy fry a magnetic thrust chamber and ...
4
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0answers
119 views

What does a high Hall Effect Parameter mean in MPD thrusters?

MagnetoPlasmaDynamic Thrusters are plasma thrusters in which the acceleration of the fluid (plasma) is carried in a electromagnetic way. The electric field and the lorentz force are the primary causes ...
4
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0answers
98 views

Electron buildup in Hall effect thrusters?

I was thinking about the Hall Effect Thrusters and how they are able to produce thrust. There's something that I don't understand: when the hollow cathodes emit electrons to neutralize the flow at the ...
3
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124 views

Are there any situations where hot rather than cold propellants might be advantageous?

Given that cryogenic fuel and oxidisers exist, I wonder if the reverse is workable. Are there fuels or oxidisers that have been considered for rockets that must be kept hot to be usable? By hot I ...
3
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0answers
170 views

Could it be possible to “steam” up water to orbit and collect it there?

Water is cheap and useful for many purposes in space (fuel, life support, radiation shielding and maybe even as the bulk part of construction material if covered from sublimation in vacuum). But ...
2
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0answers
70 views

Switching off the magnetic coils in a Hall Effect Thruster

Talking about Hall Effect Thrusters (HET), we can say that the presence of a hollow cathode is relevant to reach a good operation of the thruster. We also can plot the potential-x (trajectory of ...
1
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28 views

Injectors Diameter and Numbers

how would you determine the diameter and the number of injectors if unlike doublets elements are used? The Data given is: Isp =286 s Chamber pressure= 25 bars Propellant pair: Fuel= Hydrazine and ...