"Terrell Miller" wrote in
:

"Clark" stillnospam@me wrote in message
...

Right. The arm operator and the IVA crewmember need to be separate
people, because they have to pay attention to different things. So
the minimum crew size for a dual-pair EVA flight is six.

Errr, ummm, that would be four assuming the non-EVA pair would be IVA
and
arm
operator. They would have to be cross trained but what's wrong with
EVA today, arm operator tomorrow?

do you really want the person working the robot arm to be the same
person that worked themselves to the brink of exchaustion theprevious
day doing an 8-hour EVA?

Right. Astronauts are generally in better-than-average physical shape, but
they're not supermen.

Didn't think so. Oh, and with a crew of four, one of each pair would
have to be fully-trained shuttle pilots, so now they have *three* jobs
to prepare for. *Bad* Clark, no cookie...

Expanding on this, training would be a problem in general. EVA training is
typically the long pole in the tent in terms of total hours. A crewmember
supporting both EVA teams would wind up with a *lot* of EVA training hours.
It's not impossible (I think it's been done before), but it's not the
preferable way to operate.

--
JRF

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