Talk:Field propulsion/GA1

GA review

Article (edit | visual edit | history) · Article talk (edit | history) · Watch

Nominator: Very Polite Person (talk · contribs) 22:51, 1 March 2026 (UTC)

Reviewer: ToadalChaos (talk · contribs) 10:18, 15 March 2026 (UTC)

You’ve identified a real scope problem, and I think the cleanest fix is to withdraw this GAN, split the electric-propulsion-heavy material back into Spacecraft electric propulsion, and bring both articles back in tighter form. Earlier versions of the article were much closer to a narrower historical field-propulsion treatment, but as the source base expanded, especially on parallel electric-propulsion history, the page grew beyond what is ideal for GA review. Rather than force that into one article, I’m going to separate the material into two focused pages. — Very Polite Person (talk/contribs) 18:28, 15 March 2026 (UTC)

@ToadalChaos: I can withdraw the withdrawl if you want to continue. The complete separation turned out to be much easier than I expected by far. I suppose building this out in the way I did for so long made it easy and comparmentalized.

* Current state of FP page is now here: Field propulsion

* And the rest is now at: Spacecraft electric propulsion

What do you want to do? — Very Polite Person (talk/contribs) 18:31, 16 March 2026 (UTC)

@Very Polite Person thanks for the responses and swift action! I haven't had time yet to read in detail but the changes si far definitely look like a step in the right direction!

What do you think about renaming the article? This is currently my biggest "gripe" (see review).

For context: I'm a spacecraft engineer who routinely deals with various propulsion systems currently in flight.

The term "field propulsion" seemed odd to me and to those colleagues who I've asked. Though I was/am willing to be proven wrong I think my research (see review) supports my initial hunch: practically all publications (particularly recent ones) on proven technologies use the term "propellantless propusion", whereas those who use "field propulsion" are highly theoretical and yet to be exerimentally proven (and often much older). "Field propulsion" also seems to have gained some traction among UFOlogists and conspiracy theorists in recent decades.

I think the article should be titled "propellantless propulsion" and give "field propulsion" as an alternative name. There should also be explicit acknowledgement that this area is rife with speculation and fringe theories. ToadalChaos (talk) 08:01, 17 March 2026 (UTC)

On the WP:FRINGE point, I think the current article already handles this appropriately.

Field propulsion is now clearly separated from Spacecraft electric propulsion and from Reactionless drive, and the article itself distinguishes demonstrated systems, developmental systems, and theoretical proposals. The theoretical material is brief, attributed, and explicitly described as unvalidated. That is the relevant policy question here: whether the article presents minority or speculative ideas with proper attribution and due weight. I think the current version does.

For ease of review, this is the theoretical material presently included near the end of the article:

Minami and Musha frame field propulsion at the physics frontier as interaction with a "substantial physical structure" of space, drawing on general relativity at macroscopic scales and quantum field theory at microscopic scales.[2]: 215–216

In Minami and Musha's framing, propulsive force arises from interaction with a physical structure of space instead of from expelling reaction mass.[2]: 216–217

As one candidate concept, Minami treated space as "an elastic body like rubber" and argued that space curvature could create an "acceleration field," stating that "a space drive is produced in the region of curved space."[49]: 352 [94]: 20–21

A 1979 NASA technical memorandum outlined a speculative field resonance propulsion concept that hypothesized thrust from a resonance between coherent pulsed electromagnetic field waveforms and gravitational waveforms associated with spacetime metrics, framed as potentially enabling galactic travel without prohibitive travel times.[95]: ii

Minami and Musha distinguish between two field propulsion concepts: one framed in terms of general relativity and one in terms of quantum field theory.[2]: 215–220

According to quantum field theory and quantum electrodynamics, the quantum vacuum is modeled as a nonradiating electromagnetic background, existing in a zero-point state, the minimum energy allowed by the theory.[94]: 24–25

It was proposed that applying this to an electrically insulating material could, via Lorentz forces on charges bound within the material, affect its inertia and thereby create acceleration without internal mechanical stress.[2]: 216–219

Potential concepts studied by NASA and other parties have included vacuum polarization, engineered spacetime curvature, and zero-point-field interactions; none have been experimentally validated, and all face unresolved consistency issues with momentum conservation.[10]: 2

I do not see a policy basis for adding broader cautionary framing beyond that. If there are particular sentences that overstate the maturity or acceptance of a concept, please identify those specifically and I will look at them one by one.

For additional context, the article was previously raised at Wikipedia:Fringe theories/Noticeboard#Field propulsion. It may be useful background for this point. — Very Polite Person (talk/contribs) 15:42, 17 March 2026 (UTC)

On the renaming and WP:SCOPE matter: My concern with the rename proposal is that I see this as a distinct article from what could be Propellantless propulsion, which I think would be a broader topic. Aerobraking, for example, is propellantless in the broad sense but is not field propulsion.

This article is about the historical and source-defined field-propulsion family, including the broader survey tradition reflected in the literature and the way that scope evolved over time. The relevant sources here do not use "field propulsion" as a strict synonym for "propellantless propulsion". They use it as a broader category that, depending on the framework, can include environment-coupled propulsion, related beamed-energy concepts, terrestrial field-matter coupling systems, and theoretical proposals. We are required to follow the scope actually used in the reliable sources, even where that may not align with narrower present-day usage or undocumented industry norms. If we do not, we would either be misrepresenting the source literature or forcing the article into a scope narrower than the sources themselves support.

That is also why I do not think Propellantless propulsion is the right title for this article as presently scoped. It would describe only the narrower modern subset and would create a mismatch between the article title and the sourced scope of the content. You would then either have to remove material that the source literature explicitly groups under field propulsion, or keep that material under a title that is narrower than the article itself.

The current Field propulsion article already explains this relationship in the Definitions section: "field propulsion" as the broader historical umbrella, and "propellantless propulsion" as a narrower modern usage. I think that is the right way to handle the nuance. The title should reflect the scope of the article actually supported by the sources.

So my view is that Field propulsion is the correct title for this article, while Propellantless propulsion would be a separate, broader article if and when that topic is developed on its own terms. — Very Polite Person (talk/contribs) 15:43, 17 March 2026 (UTC)

I think we agree that the following is supported by the literature:

1. Propellantless Propulsion (I will use PP as shorthand) is a wide umbrella term encompassing all methods for propulsion without propellant
2. Field Propulsion (FP) is used for some, but not all, methods of PP

To be clear, I am not suggesting we remove the term FP. I had misunderstood the article's scope as encompassing all methods in the PP family.

I agree with you that available literature should guide Wikipedia's coverage of these topics. In this regard I think PP should be acknowledged as the broader umbrella term, and the term FP should be applied to methods that are labelled as such in the literature.

I don't think the article in its current form reflects this appropriately. There is indeed a passage mentioning PP in the definitions, however the article as a whole uses FP as the primary, broad term. In particular FP is applied to techniques which have never been labelled as such in the literature, such as solar sailing (as far as I can tell).

My initial idea was to resolve this by renaming the article and having a section for FP. However I like your proposed solution: have a dedicated article for PP with a section for FP which has a "Main Article" link to FP. I think this way both articles could have a well-defined WP:SCOPE which appropriately reflects literature usage and both titles would follow the WP:CRITERIA for article titles.

I will gladly take the lead on writing the page on PP. In doing so I will endeavour to appropriately name methods within the FP "family" as such and restrict the PP title to methods actually named as such by literature. ToadalChaos (talk) 08:32, 18 March 2026 (UTC)

Thanks, that sounds sensible to me.

Propellantless propulsion is currently a redirect here, so spinning that out as the broader umbrella article should be straightforward. I agree that it would help to have the scopes separated cleanly, with Field propulsion covering the source-defined FP family and Propellantless propulsion covering the broader umbrella topic.

I'd be happy to help with that buildout. There is already a fair amount of usable material split across Field propulsion, Spacecraft electric propulsion, Reactionless drive, and Non-rocket spacelaunch, so I suspect getting a solid starting structure in place should be pretty easy. My list-defined layout for both FP and SEP should make transplanting simple.

One practical suggestion from the sourcing side: I strongly recommend list-defined references from the outset, as used now in Field propulsion and Spacecraft electric propulsion. It makes larger propulsion-history pages much easier to maintain once the source base grows. — Very Polite Person (talk/contribs) 16:47, 18 March 2026 (UTC)

Awesome, it seems like we have a good way forward.

I have started working in User:ToadalChaos/Propellantless Propulsion and as soon as I have the bare mininum put together, I will publish it at Propellantless propulsion. Thankfully this should not take too long, largely thanks to the great work you've already done collecting and organising references.

I will ping you here when that article is up, if you don't already have it on your watchlist. Help is of course also welcome in building that out. I expect we may want to rearrange some content across these pages either way.

Thanks for the tip about list-defined refs; I had already noticed that approach when writing the review and it seems like the way to go. ToadalChaos (talk) 21:07, 18 March 2026 (UTC)

On second (third?) thought I'll keep the GAN here withdrawn and will do another few passes on both articles. I'll let you know when I renominate. — Very Polite Person (talk/contribs) 18:39, 16 March 2026 (UTC)

@ToadalChaos I realize this GAN suddenly went into a few twists and turns -- do you want to keep it going?

I'm happy to if you are, now that what seemed like (genuinely at first!) large intractible matters are sorted? — Very Polite Person (talk/contribs) 17:12, 18 March 2026 (UTC)

I'll close the GAN for now, to be reopened at a later stage. This page is so closely related to Propellantless propulsion that I expect we'll be tinkering with it some more until that page is a little more stable. By that stage I think we'll have a genuinely great article here, one over at Spacecraft electric propulsion and perhaps eventually another at SEP.

Thanks for working with me on this. I was very apprehensive about writing this review; I was afraid it would degenerate into a classic internet flamewar. But you have proven to be genuinely polite and open-minded even in the face of critique to your work. That's non-trivial and hugely appreciated. ToadalChaos (talk) 21:32, 18 March 2026 (UTC)

Note: this review is a work in progress. The general gist is there but I will continue to add links and references in the coming days.

This article has potential for becoming a genuinely very good article, but needs more work to bring it up to par with similar Wikipedia pages in terms of sourcing rigour and technical language. In its current state it does not meet the WP:GA? standards. In particular Wikipedia:Verifiability and Wikipedia:Summary_style.

I am willing to contribute myself, provided User:Very Polite Person, who has authored much of it, is willing to work with me. The following are some suggestions:

1. Rename to Propellantless Propulsion
2. Improve the definition and improve the lead section
3. Remove references to technologies that are not propellantless, such as electric propulsion. These should at most warrant a mention in a "related concepts" section where it is made clear why they do not belong in this category
4. Clearer distinction between proven technologies (eg aerobraking, solar sails), areas of active research (eg laser-accelerated lightsails, air-breathing ion drives) and highly speculative/fringe proposals which would require new physics or significant technological progress (eg spacetime manipulation, Alcubierre drives, Bussard ramjet).
5. Add "Not to be confused with: Reactionless Drive" box and make difference more clear in the text
6. Additional concepts worth mentioning: aerobraking, aerocapture, third-body perturbations, Sun-synchronous orbit
7. Overall I feel the article has excessive detail, in contrast to Wikipedia's summary style. It makes numerous references to concepts that do not fit the definition without making sufficient effort to keep them distinct. The end result is confusing for the reader. (see Wikipedia:Too_much_detail and WP:INDISCRIMINATE)
8. Statements like "Traditional rocketry has dominated aerospace propulsion in the 20th and early 21st centuries." make it seem like this field was unfairly sidelined when in fact it is simply technical and theoretical limitations that have made it hard to make faster progress.
9. The history section is overly detailed (see Wikipedia:Too_much_detail and WP:INDISCRIMINATE). Much of the content is about electric propulsion and therefore only tangentially relevant. There are many references to pioneers of spaceflight such as Hermann Oberth and Wehrner von Braun; however these are, as far as I can tell, only in reference to electric propulsion (and therefore not applicable and misleading).

Rename to Propellantless Propulsion

The article should be renamed to Propellantless Propulsion. This name is trivially understandable by anyone as meaning "propulsion without propellant". The term "Field Propulsion" however is unclear to anyone except those familiar with the history of this specific term (including domain experts in spacecraft propulsion). In addition I think Field Propulsion is confusing because when searching online, it returns false positives which make it seem more common than it is. Propellantless propulsion is more specific and yields more results that are more relevant to the topic of aerospace propulsion.

"Field propulsion", taken literally, means "propulsion with fields", which differs from how it's defined on this page. This makes it confusing to a scientifically literate audience. The term "field" as understood in physics is simultaneously too vague (which fields: electric, magnetic, gravitational, scalar, vector, something else? Ambient fields or self-produced?) and also too specific (not all propellantless technologies make use of "fields" of any kind, most notably solar sails and aerobraking) to be meaningful to anyone with general scientific training.

Searching for field propulsion (without quotes) online includes many hits from content using the terms "field" and "propulsion" in isolation, but not "field propulsion" as intended here. Most notably this includes articles and papers on electric propulsion technologies (ion thrusters), which uses electric fields to achieve propulsion, but in no way fits the definition of propellantless propulsion. Although the current article does mention that these are not propellantless technologies, it still includes them as "field propulsion". Some few sources use the term "electric field propulsion", however this is to be understood as "propulsion that involves electric fields"; I have yet to find an article that explicitly classifies ion thrusters as a member of the broader category "field propulsion".

It is therefore important, when searching online, to use "field propulsion" with quotes. This drastically reduces the number of unrelated hits. However, it still includes many tangentially-related topics such as nanorobotics, where magnetic fields are used to move microscopic robots.

A Google Scholar search for "field propulsion" (with quotes) returns 793 results. Of these, many are on unrelated topics (eg "Depositional Control of Macroscopic Particles by High-Strength Electric-Field Propulsion" which is about dusting crops using electrostatically-charged pesticides). Most of the articles actually using the term for spacecraft propulsion are in the domain of extreme speculation (eg antigravity) or straight-up UFOlogy (which doesn't mean they can't be cited, but since UFOlogy is generally considered a fringe science, they should be clearly indicated as such as per Wikipedia's guidelines WP:FRINGE).

In contrast, an equivalent search for "propellantless propulsion" returns 953 hits. These generally seem more on-topic, from better-established research centres on spacecraft propulsion (eg NASA), contains fewer references to speculative terms like antigravity and appears to have far fewer results relating to UFOlogy.

Obviously such a comparison is not sufficient by itself but is a strong first indicator that Propellantless Propulsion is a more commonly-understood term.

Furthermore, of the references currently used in the article, I have found only one author who actually uses the term Field Propulsion in a sense compatible with the article's definition (which, incidentally, lacks a citation). One more source uses the term (three times in a 500-page report) but does not define it and it is not clear from context what they mean by it. However, multiple independent sources clearly use or define the term Propellantless Propulsion and similar terms such as "propulsion without the use of propellant", "orbit changes without propellant". This alone I would say is a robust argument to retitle the page - the authors of this page have presumably already done a lot of research and selected the best sources.

I have also collected several more peer-reviewed and highly cited sources using the term "Propellantless Propulsion".

Rename to Propellantless Propulsion discussion

Please see my reply here: https://en.wikipedia.org/w/index.php?title=Talk%3AField_propulsion%2FGA1&diff=1343983368&oldid=1343983240

On the renaming and WP:SCOPE matter: My concern with the rename proposal is that I see this as a distinct article from what could be Propellantless propulsion, which I think would be a broader topic. Aerobraking, for example, is propellantless in the broad sense but is not field propulsion.

This article is about the historical and source-defined field-propulsion family, including the broader survey tradition reflected in the literature and the way that scope evolved over time. The relevant sources here do not use "field propulsion" as a strict synonym for "propellantless propulsion". They use it as a broader category that, depending on the framework, can include environment-coupled propulsion, related beamed-energy concepts, terrestrial field-matter coupling systems, and theoretical proposals. We are required to follow the scope actually used in the reliable sources, even where that may not align with narrower present-day usage or undocumented industry norms. If we do not, we would either be misrepresenting the source literature or forcing the article into a scope narrower than the sources themselves support.

That is also why I do not think Propellantless propulsion is the right title for this article as presently scoped. It would describe only the narrower modern subset and would create a mismatch between the article title and the sourced scope of the content. You would then either have to remove material that the source literature explicitly groups under field propulsion, or keep that material under a title that is narrower than the article itself.

The current Field propulsion article already explains this relationship in the Definitions section: "field propulsion" as the broader historical umbrella, and "propellantless propulsion" as a narrower modern usage. I think that is the right way to handle the nuance. The title should reflect the scope of the article actually supported by the sources.

So my view is that Field propulsion is the correct title for this article, while Propellantless propulsion would be a separate, broader article if and when that topic is developed on its own terms.

Thanks. — Very Polite Person (talk/contribs) 16:02, 17 March 2026 (UTC)

I do not think those additional sources supersede the title-scope issue.

My objection is not that "propellantless propulsion" is an invalid term. It is that it refers to a broader umbrella topic than the one this article presently covers. This article is built around the historically sourced field-propulsion literature, which includes material that would not sit comfortably under a narrower propellantless-only title. For that reason, I still think Field propulsion is the correct title for this article as scoped, while Propellantless propulsion would be a separate broader article if developed. — Very Polite Person (talk/contribs) 16:13, 17 March 2026 (UTC)

One more thing you may have missed: this link here is my backlog where many sources and URLs are explicit on calling it "field propulsion" (and more URLs in page history): https://en.wikipedia.org/wiki/Talk:Field_propulsion#Current_sourcing_backlog

I've got around 20+ sources that explicitly call out the term "field propulsion" between live article and backlog. They aren't even all fully integrated yet (article went sideways with electric which is now split). Field propulsion really is the general evolved historical literature term, even if it's uncommon and not widely known. You are (no joke) around the 5th or 6th person to make this same argument, but the sourcing is solid over time. — Very Polite Person (talk/contribs) 16:29, 17 March 2026 (UTC)

Yes, I have seen that list. In my initial review I restricted myself to sources actually cited in the article as it was at the time, since I was trying to identify the scope of the actual article.

I do not mean to say that Field Propulsion is not a name used in literature, merely that it is not used for all the things Propellantless Propulsion is used for. I think the sources you have collected both in the article and in the talk section bear this out. For example, I have not found any that use the term Field Propulsion for solar sails, whereas there are several that categorise solar sails as propellantless. ToadalChaos (talk) 08:41, 18 March 2026 (UTC)

Thanks, that is a fair distinction. For the sails point, some of those historical definitions and later propellantless classifications do overlap awkwardly over time, so I made five edits to move the photon / solar sail material into a narrower bucket and to clarify the surrounding context for the rest:

https://en.wikipedia.org/w/index.php?title=Field_propulsion&diff=1344143993&oldid=1344030283

On the broader terminology point, I have also turned up a few additional sources since yesterday that further document field propulsion as an established term in the literature generally. I will add those when I get a chance this week. — Very Polite Person (talk/contribs) 16:37, 18 March 2026 (UTC)

Improving the definition and lead section

The current definition in the article's lead:

Field propulsion is a category of terrestrial and spacecraft propulsion in which thrust is generated by coupling a vehicle to external fields or ambient media rather than by expelling onboard propellant.

fails verification and is not very technically sound. As is, it includes every type of locomotion except rockets: ship sails, propellers, jet engines, cars (both ICU and electric), even human legs.

It should be restricted to aerospace research and use more technically accurate language. A proposal, based on:

In aerospace engineering, propellant-less [or "field" if we don't rename the page] propulsion systems generate thrust via interaction with the surrounding environment (e.g., solar photon pressure, planetary magnetic fields, solar wind and ionospheric plasma pressures, and planetary atmospheres). By contrast, chemical and electric propulsion systems generate thrust by expulsion of reaction mass (i.e., propellant).

The rest of the lead section also needs some editing and better citations; it currently contains several claims that I cannot verify based on the references cited on the page. Better would be to provide citations directly in the lead section. Some statements that require direct citation as they are not trivially verifiable include:

• "Within aerospace engineering research, the label spans both environment-coupled systems such as solar sails, magnetic sails, and electrodynamic tethers, and efforts to engineer field-matter coupling using electromagnetic propulsion (including electrohydrodynamics and magnetohydrodynamics), as well as speculative mechanisms that draw on general relativity, quantum field theory, or zero-point energy to alter effective inertia or couple directly to fields of space."
• "Field propulsion concepts evolved alongside conventional rocketry, with origins in 17th-century observations of radiation pressure and early 20th-century electrical and electrostatic research."
• "Mid-century classification frameworks organized advanced concepts under thermal, field, and photon headings, and later criteria-driven programs such as NASA's Breakthrough Propulsion Physics Program established conservation-law consistency and experimental reproducibility as central benchmarks."

It also makes reference to electric propulsion which does not fit the definition provided just a few lines above and, as I wrote previously, should be removed from the article. Furthermore, the relation to STS-75 is unclear, especially in the lead section: TSS-1R and related experiments made no mention of propulsion research as a goal (even though the concept of space tethers has been proposed for propulsion, it was not in relation to TSS-1R), even though one reference I found mentions them in this sense.

Improving the definition and lead section discussion

Just noting that the feedback here was basically rendered moot by this edit: https://en.wikipedia.org/w/index.php?title=Field_propulsion&diff=1343823048&oldid=1343647274

It became a new article there. — Very Polite Person (talk/contribs) 15:48, 17 March 2026 (UTC)