Re: Fuel cell?
- From: ljfinger@xxxxxxx
- Date: 6 Sep 2006 12:07:32 -0700
Jeff Findley wrote:
Since the fuel cells are so hard to service on the shuttle,
why not design the thing to operate nominally on three fuel cells but
include a fourth specifically to cover the case of a fuel cell problem on
the pad?
Each fuel cell weighs 255 pounds. If you carry an extra redundant fuel
cell, which crew member would you leave behind? What about extra
redundant sets of everything else that can go wrong? Is it okay to
leave the payload behind?
At some point, you have to decide how much redundancy you *require* for
launch and then design in exactly that amount, and no more. Otherwise,
you have to carry all those redundant parts for the other redundant
parts into space with you on every flight.
Lee Jay
.
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