DeepDrummer Posted July 11, 2018 Posted July 11, 2018 (edited) The era used an economizer type mask (Type D, E, G and more that flowed Oxygen on demand by the Pilot inhaling if the system was open with the Oxygen valve open. This is why the oxygen valve is turned on at startup in procedures. The mask would not flow oxygen when hanging around the neck I guess. We have flow with the valve in the closed position with zero pressure charging the system. That makes no sense at all. One spot I ran across this info was here in the second paragraph called history note. https://www.iwm.org.uk/collections/item/object/30015762 You have to click on "show more" after the first paragraph. Edited July 11, 2018 by DeepDrummer Win 10 pro 64 bit. Intel i7 4790 4 Ghz running at 4.6. Asus z97 pro wifi main board, 32 gig 2400 ddr3 gold ram, 50 inch 4K UHD and HDR TV for monitor. H80 cpu cooler. 8 other cooling fans in full tower server case. Soundblaster ZX sound card. EVGA 1080 TI FTW3. TM Hotas Wartog. TM T.16000M MFG Crosswinds Pedals. Trackir 5. "Everyone should fly a Spitfire at least once" John S. Blyth
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