On Fri, 29 Aug 2003 09:56:17 GMT, "Dholmes"
wrote:

Interestingly a 6 man OSP would weight about 20 tons and require a heavy
lift vehicle so it would really use three rockets.

I think you're over by a factor of two. the Apollo capsule (13,000
lbs) was rated for five crew (SkyLab rescue) six was easily possible,
and nine was an option if they really worked hard at reconfiguring the
cabin. A Service Module for ISS transport will weigh much less than
30,000 lbs. I don't see a capsule OSP variant for six crew being
anywhere near 20 tons.

Brian