Simviation Forum - Raptor O2 problem link found

Nov 28^th, 2012 at 4:48pm

wahubna Offline
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Michigan

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I am so sick of people trying to tell me that since the F-15 and 16's O2 system works the Raptors should be easy to design.

The F-22 operates in a different envelope which creates many more engineering challenges and physiological problems than that of the F-16 and F-15. Sadly, even a USAF cadet did not understand this (he flies AT-6 Texan IIs)....but I guess that is why he is not in engineering Roll Eyes

http://www.aviationweek.com/Article.aspx?id=/article-xml/asd_10_12_2012_p03-02-5...

‎"At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation."- Igor Sikorsky

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Reply #1 - Dec 2^nd, 2012 at 11:22pm

OVERLORD_CHRIS Offline
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No C-17B's, C-5M's for
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“Unlike most other aircraft oxygen generation systems, the breathing air to the F-22 pilot is not diluted with cockpit air to obtain the appropriate oxygen partial pressure (PPO2) necessary to maintain physiological function at a particular altitude, but rather it is concentrated to the necessary PPO2 by controlling the cycling of the Obogs.”

Sounds very complicated, but they are on the right path.

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Reply #2 - Dec 3^rd, 2012 at 12:05am

wahubna Offline
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Michigan

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OVERLORD_CHRIS wrote on Dec 2^nd, 2012 at 11:22pm:

“Unlike most other aircraft oxygen generation systems, the breathing air to the F-22 pilot is not diluted with cockpit air to obtain the appropriate oxygen partial pressure (PPO2) necessary to maintain physiological function at a particular altitude, but rather it is concentrated to the necessary PPO2 by controlling the cycling of the Obogs.”

Sounds very complicated, but they are on the right path.

That is what it sounds like.
I also found it rather stunning how many people were saying it was an easy problem to find. NASA and thousands of scientists & engineers were wrong repeatedly. This was/is definitely a very difficult problem.

‎"At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation."- Igor Sikorsky

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