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The SR-71 is pressurized. Not to sea level pressure, obviously, but it wasn't exactly unpressurized either. The main reason the crew wore pressure suits is for
by jacquesm 10mo ago
The SR-71 is pressurized. Not to sea level pressure, obviously, but it wasn't exactly unpressurized either. The main reason the crew wore pressure suits is for heat retention and oxygen delivery.
- mmooss 10mo agoInteresting; I wonder why the bothered to pressurize it. It would seem to add a more complexity to many things - every seal, seam, etc - plus the pressurization system. Maybe some equipment ran better with more pressure. Even commercial passenger flights are not pressurized to sea level; I think it's something like 8,000 ft. IIRC, Boeing's 787 was designed to be pressurized a bit more which, from on-the-ground experience acclimatizing to altitude, I think could make a noticeable difference.
- jacquesm 10mo agoRunning stuff in an unpressurized environment at that altitude brings another set of challenges.