No fuel is what is ejected as propellant . The EM drive converts electricity directly into microwaves , which then somehow produces thrust . In theory this thing could also use solar cells to produce electricity . Of course that would only be effective in solar systems . <| sep |> Remember when the electronic voting machines in news 2015 apr 15 v i r g i n i a h a c k ingvotingmachinessecurity ? clientsafari had passwords like abcde and admin ? Anyone within a half mile could have modified every vote , undetected , Epstein said in a blog post . I got to question a guy by the name of Brit Williams , who ' d certified them , and I said , ' How did you do a penetration test ? ' Epstein told the Guardian , and he said , ' I don ' t know how to do something like that '. You could have broken into one of these with a very small amount of technical assistance , Epstein said . I could teach you how to do it over the phone . It might require an administrator password , but that ' s okay , the password is ' admin '. Bypassing the encrypted WEP wireless system also proved easy . The password turned out to be ABCDE , according to the state ' s security assessment and getting the password would take a few minutes and after that you don ' t need any tools at all , said Epstein .