Electric Rocket Fuel

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tl;dr -- it kind of doesn't usually fail entirely

"
Impulse bit can vary by as much as 40% over the thruster lifetime, and 60% from thruster to thruster. Plume temperature can vary by over 50% from thruster to thruster, and typically decreases by a factor of 2 or more in early thruster lifetime. Electron density does not vary considerably over pulse lifetime, but can vary by up to 3 orders of magnitude from thruster to thruster.
"View attachment Characterization of electric solid propellant pulsed microthruste.pdf

PS: Batteries aren't that great at storing energy.
 
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