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Post by shorty on Sept 6, 2021 18:58:20 GMT 12
Watching clips of RAF and USAAC bomber crews I see that they have different styles of oxygen masks. The US ones have a type of bladder on them whereas the British type don't. What is the purpose of this bladder?
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Post by camtech on Sept 6, 2021 20:02:17 GMT 12
Not S & S, Shorty but ex Instruments. We used to service the oxygen systems on aircraft, except the masks.
My suspicion is that the earlier US masks used the bladder as a crude regulator. British systems used a regulator in the actual regulator box, with normally a normal/100% option.
I no longer have my training notes, so can't check.
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Post by davidd on Sept 7, 2021 7:18:15 GMT 12
Was not the bladder a rebreather?
David D
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Post by Dave Homewood on Sept 7, 2021 7:37:58 GMT 12
Although I know what you refer to, I never saw any bladder types in my service so I'm afraid I have no idea.
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Post by tbf2504 on Sept 7, 2021 10:11:39 GMT 12
Dave, from the book :Flying Clothing by Louise Greer and Anthony Harold
"Initially in B17E aircraft, crews wore the A8 mask, linked to an ABA constant-flow regulator. The mask had sponge-filled parts which allowed exhalation to the atmosphere; a re-breather bag was also involved. With a small quantity of oxygen filling the bag at low altitude, the bag would be exhausted before the lungs filled so the rubber parts in the mask allowed air to enter to complete inspiration. This was a basic-dilution system."
so the bag was a re-breather component of the oxygen system
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