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28 Mar 2024, 17:42 [ UTC - 5; DST ]


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 Post subject: Re: Flying the U2 to the edge of space
PostPosted: 21 Jun 2018, 17:17 
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John, it sounds like the Lear was equivalently pressurized to the U2 if you were are 10,000 PA at 51,000 and the U2 is at 29,000 feet at 70,000? I wonder what it would take in terms of fuselage strength to build a plane that had a 10k PA at 70,000?


Off the top of my head, the single-seat U-2's were pressurized at a 3.8 psi differential... which gave the 29,000' cockpit altitude at FL700. The two-seaters still have that pressurization schedule, since they were unmodified.

All single-seaters (except for NASA's two jets) were modified to a 7.6 psi differential... cutting cabin altitude to ~14,500' at FL700. The decompression sickness issues that have plagued the U-2 community for so long should be a thing of the past.

Two unplanned consequences of the modification are that O2 consumption increased, and the cabin cooling is not near what it used to be.


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