In message , Jeff Findley
writes

"Herb Schaltegger" wrote in
message .com...

Getting rid of the nasty hypergolic propellants is something NASA has wanted
to do for a long, long time. Unfortunately, it's one of the many shuttle
upgrades that never happened. :-(

For a new vehicle, it would be nice to get rid of the hypergolics and go
with something a lot more friendly, so hopefully you don't have to pull the
RCS systems after every flight anymore.

What could they use that isn't nasty, and _is_ reliable?
--
Remove spam and invalid from address to reply.