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The tag is used on 125 questions and it's usage guidance is:

Questions about engines used in space that accelerate ions to create thrust.

and it has been synonymized with , and .

The tag is on 59 questions, and it's usage guidance is:

The electric-propulsion tag has no usage guidance, can you help us create it?

Question: Is a catch-all tag for several kinds of propulsion that may not overlap with ? Perhaps things that use charged particles in the solar wind or existing magnetic fields along with electrical power in a spacecraft? Or should these two also be synonymized?

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  • $\begingroup$ Resistojets are electric propulsion devices that are not ion-thrusters. en.wikipedia.org/wiki/Resistojet_rocket $\endgroup$
    – Organic Marble
    Commented Apr 22, 2021 at 21:34
  • $\begingroup$ @OrganicMarble To "Is electric-propulsion a catch-all tag for several kinds of propulsion that may not overlap with ion-thruster?" are you suggesting "yes" without saying it? 1, 2 (and 3 from here) are also "electro-thermal" as well. Should questions like those first two have the electro-propulsion tag as well? $\endgroup$
    – uhoh
    Commented Apr 22, 2021 at 23:19
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    $\begingroup$ I'm agreeing (I think) that "electric propulsion" =/= "ion-thruster" $\endgroup$
    – Organic Marble
    Commented Apr 22, 2021 at 23:19
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    $\begingroup$ @OrganicMarble I'm currently un-coffee'd so you have me at an advantage. I see, to "...are they distinct" the answer is yes. $\endgroup$
    – uhoh
    Commented Apr 22, 2021 at 23:21
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    $\begingroup$ There are enough questions between the two tags to justify having more than one tag. However, I do not feel qualified to specify exactly what those tags should be called. $\endgroup$
    – DrSheldon
    Commented Apr 25, 2021 at 9:18

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Based on comments under the question it seems that the two tags are indeed distinct and refer to different methods, capabilities and equipment.

Before going further, let's see what all "electric propulsion" can mean to the community. I've just asked What are all the kinds of electric propulsion that don't qualify as ion propulsion in standard spaceflight lingo? and included a list of potentially relevant questions here that may at least partially "span the space" so to speak.

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