>Not really. Not when you account for ancillary costs power/weight etc. >Apollo missions used fuel cells afaik, and only one ever went bad afaik. And as I understood it that failed only because of damage that had occurred when it was dropped at some stage during the assembly of the spacecraft. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body