home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.space
- Path: sparky!uunet!gatech!rpi!clotho.acm.rpi.edu!strider
- From: strider@clotho.acm.rpi.edu (Greg Moore)
- Subject: Re: ground vs. flight
- Message-ID: <1jt2zfd@rpi.edu>
- Nntp-Posting-Host: acm.rpi.edu
- Organization: The Voice of Fate
- References: <ewright.724956784@convex.convex.com> <zms23rp@rpi.edu> <Bzopwn.MGC@zoo.toronto.edu>
- Date: Wed, 23 Dec 1992 05:10:56 GMT
- Lines: 52
-
- In article <Bzopwn.MGC@zoo.toronto.edu> henry@zoo.toronto.edu (Henry Spencer) writes:
- >In article <zms23rp@rpi.edu> strider@clotho.acm.rpi.edu (Greg Moore) writes:
- >> I can recall only 1 (possibly 2) examples of astronauts
- >>transferring between craft via EVA. And in that case I believe
- >>the craft were linked...
- >> I don't doubt that someday we'll see EVA between
- >>non-docked craft...
- >
- >"Someday" was 1966, on Gemini 10. And the target craft for the EVA wasn't
- >even stabilized -- it was an old Agena, batteries long since dead. Apart
- >from the problems of EVA itself, which NASA was only just starting to
- >discover, it wasn't a problem according to Michael Collins (who did it).
- >
- I wasn't aware of this. What did Michael Collins do while on
- the Agena?
- BTW, it's partly the EVA itself I'm talking about. We STILL
- need more experience, lots.
-
- >You might also want to look up the Solar Max retrieval (as originally
- >planned), the Palapa/Westar retrieval, and the Leasat repair, all of
- >which involved astronauts interacting with undocked craft. The Leasat
- >repair, in particular, was done by the Intelsat method: slide the
- >shuttle up close to the satellite and have an astronaut grab it (and
- >Leasat was spinning, too).
- >
- Good point.
-
- >By the way, why do you assume the craft wouldn't be linked before crew
- >or cargo transfer? It would make sense to at least have an arm linking
- >them first.
- >
- You're right.
-
- >On-orbit operations are a little bit harder than on-ground operations,
- >for two reasons: lack of friction, and the extra dimension of motion.
- >On the ground, before you refuel (say) an aircraft, you make sure it's
- >parked with its brakes locked. The equivalent in orbit is to grab hold
- >of it with an arm. Still lots easier than for aircraft in flight.
-
- Agreed. And the aircraft analogy was flawed. BTW, what is
- the maximum mass that the RMS can handle?
- BTW, what has the success rate been with the RMS on grabbing
- stuff with a handle? Anyone have any clue? 80% 90%? Let's
- not even consider the stuff it's had to attempt to grab that didn
- have handles. I'd assume that DC-1 and any satellites it launches
- has handles. (They are cheap enough.)
-
- >--
- >"God willing... we shall return." | Henry Spencer @ U of Toronto Zoology
- > -Gene Cernan, the Moon, Dec 1972 | henry@zoo.toronto.edu utzoo!henry
-
-
-