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2017-04-06 Science

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Posted by Skidmark 2017-04-06 00:00|| || Front Page|| [10 views ] Top

#1 Unremarkable for 30yo aircraft other than the pilot strike so similar to Monday's Saudi pilot performance anxiety and following salary increase.

Wonder if they use common OxGen systems?

Posted by Skidmark 2017-04-06 10:14|| 2017-04-06 10:14|| Front Page Top

#2 T-45 uses the OBOGs (On Board Oxygen Generating System), as does the Super Hornet and Growler; as opposed to the old style 10 litre green LOX bottles, so any contamination is likely from within the system itself. OBOGs separates oxygen molecules from the atmosphere for use, the system is completely on-board the a/c; no external servicing needed.

The waste product of this separation is high in nitrogen. the opposite of this OBOGs is OBIGGS ( On board Inert Gas Generating System) and his product is used to full the void in fuel cells with non flammable gas.

The fittings for both ports are supposed to be different size to prevent cross pollution, but perhaps there has been some maintenance issues or deliberate acts to introduce the N2 into the O2.

Posted by USN, Ret. 2017-04-06 14:47|| 2017-04-06 14:47|| Front Page Top

#3 An article dated March 29 in the Aviationist blog indicates the Super Hornet and Growler are also experiencing this same issue. THe USAF also had episodes with the F-22; common thread is OBOGS.

Posted by USN, Ret. 2017-04-06 17:32|| 2017-04-06 17:32|| Front Page Top

#4 So what is the advantage of the OBOGS?

Posted by Sock Puppet of Doom 2017-04-06 21:39|| 2017-04-06 21:39|| Front Page Top

#5 OBOGS eliminates the ground-based servicing of the breathing oxygen. old style 10 liter bottles had about a 3 hour life (one person) plus there needed to be a LOX generation plant (or 2) on all the CVs. huge explosion hazard. With OBOGS the oxygen molecules are screened from the air and sent to the crew; remainder is dumped overboard.no longer is the sortie limited by LOX (for Dr. Steve: please note 3, count 'em, 3 submissions and not once did I refer to my favorite airplane by the street slang)

Posted by USN, Ret. 2017-04-06 22:46|| 2017-04-06 22:46|| Front Page Top

23:26 alpha2c
22:46 USN, Ret.
22:28 SteveS
22:26 SteveS
22:23 Fred
22:18 charger
21:43 Frank G
21:42 Sock Puppet of Doom
21:42 Frank G
21:39 Zenobia Floger6220
21:39 Sock Puppet of Doom
21:36 Sock Puppet of Doom
21:24 Zenobia Floger6220
20:57 rjschwarz
20:55 rjschwarz
20:52 rjschwarz
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20:42 Victor Emmanuel Johnson5588
20:39 SteveS
20:03 Crusader
19:40 Frank G
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19:21 Menhadden Johnson6615
19:13 AlanC