Der findes flere varianter af RF resonans hulrumsdrev:<ref>[http://d.ibtimes.co.uk/en/full/1451129/data-eight-emdrive-thrusters-plotted.jpg?w=736 Tabel over forskellige EmDrive udformninger] fra [http://www.ibtimes.co.uk/emdrive-dr-martin-tajmar-generates-thrust-test-controversial-space-propulsion-technology-1513151 July 29, 2015, ibtimes.co.uk: EmDrive: Dr Martin Tajmar generates thrust in test of controversial space propulsion technology]</ref><ref>Anden tabel: [http://emdrive.wiki/Experimental_Results emdrive.wiki: Forces, Power, Frequency, Mode shapes, Testing Conditions (ambient or partial vacuum) and Dimensions:] {{Webarchive|url=https://archive.today/20150822082430/http://emdrive.wiki/Experimental_Results |date=22. august 2015 }}</ref>
* EmDrive, SPR Ltd, R. Shawyer.
* Cannae-drive, Cannae LLC, Guido P. Fetta.
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