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- Xref: sparky sci.energy:5597 sci.space:16129
- Newsgroups: sci.energy,sci.space
- Path: sparky!uunet!utcsri!utzoo!henry
- From: henry@zoo.toronto.edu (Henry Spencer)
- Subject: Re: opening of the first self-sufficient solar house, Press Release
- Message-ID: <BxzJyD.4y7@zoo.toronto.edu>
- Date: Thu, 19 Nov 1992 23:01:24 GMT
- References: <1992Nov13.081343.3495@quando.quantum.de> <1992Nov13.203038.28857@michael.apple.com> <1992Nov16.171017.28081@ke4zv.uucp> <1992Nov17.211228.1295@adobe.com> <2518@ispi.COM>
- Organization: U of Toronto Zoology
- Lines: 37
-
- In article <2518@ispi.COM> jbayer@ispi.COM (Jonathan Bayer) writes:
- >The Appollo 13 failure was due to an oxygen tank being dropped during
- >assembly into the service module. The drop was about three inches, and
- >the tank was throughly test after it was dropped. However, a small tube
- >apparently had been dislodged, and it wasn't detected during the
- >testing. It was only functional in weightlessness. The tube was some
- >sort of relief tube. When they turned on the internal mixers in flight
- >(the mixers kept the O2 from clumping in one area) there was an
- >explosion...
-
- This actually leaves out an important intermediate step. The (probable)
- drop damage to the tank wasn't directly responsible for the accident.
- Its main effect was to make it difficult to empty the tank after ground
- tests. And that is where the real problem crept in. When the tank
- wouldn't empty after a test, the tank's heaters were used to boil it
- dry... and thanks to another error or two along the way, the tank was
- drastically overheated and nobody realized it. This roasted the Teflon
- insulation on the in-tank wiring. In flight, when the tank stirrer
- was turned on, shorts through the ruined insulation produced sparks,
- the insulation ignited, and things went downhill quickly from there.
-
- References:
-
- Cooper, "Thirteen: The Flight That Failed".
- Murray&Cox, "Apollo: The Race To The Moon".
- NASA SP-350, "Apollo Expeditions To The Moon".
- NASA SP-4204, "Moonport".
- NASA SP-4214, "Where No Man Has Gone Before".
-
- >... When they released the
- >service module they were able to see where the explosion had occurred.
-
- Actually, not true except in a very general sense. They didn't have a
- very good view and that bay of the Service Module was quite a mess.
- --
- MS-DOS is the OS/360 of the 1980s. | Henry Spencer @ U of Toronto Zoology
- -Hal W. Hardenbergh (1985)| henry@zoo.toronto.edu utzoo!henry
-