STS 122, Colombus to the ISS |
STS 122, Colombus to the ISS |
Dec 5 2007, 10:42 PM
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
Here we are with another Shuttle launch. Only another 1000 days to go. We're going to miss that.
HD television is available @nasa new web site but not for live videos unfortunately. May be one day on the net. On top of Colombus delivery, when Atlantis will leave the ISS, we'll have the 3rd version (out of 4 scheduled) of the 16's ISS expedition crew as follow : Witson - Malenchenko - Anderson Witson - Malenchenko - Tani Witson - Malenchenko - Eyharts Witson - Malenchenko - Reisman It's nice that (the) Atlantis will deliver Colombus (remind me of something) -------------------- |
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Dec 31 2007, 02:13 PM
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Looks like this is gonna stretch on a bit; they've decided to replace a tank boundary connector.
Definitely an AC-capacitance system. Open shielding in these systems causes an off-scale high indication, which is completely anethemic to the intent of these sensors, since there would be no cutoff signal for the engines if the tank ran dry. (An open center conductor would cause an off-scale low indication, which would cause premature engine cutoff--also not good.) This is quite literally Monday-morning quarterbacking, but I have to wonder why they chose capacitive sensors for a discrete signal function. C-5 aircraft, which entered production in 1966, have tank low-level sensors as well, but they use thermistors--if the fuel's gone, they heat up & change their resistance, turning on a warning light. Guess that this might have been deemed too risky for LH2, but still... -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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