I am a member of a hard-science science-fiction group. Many authors in our group are striving to make a realistic science fiction scenario that is physically possible. At the moment we are discussing whether this ship drive idea is possible or not. But few among us are real physicist. http://www.orionsarm.com/ships/pitch_drive.html [Broken] Please give us some insight whether this idea is plausible or totally craps. Thank you.