On Mon, 8 Nov 2004 09:16:02 -0500, David wrote in message <[EMAIL PROTECTED]>:
> On Mon, 8 Nov 2004 06:05:57 +0100, Arnt Karlsen <[EMAIL PROTECTED]> wrote: > > > ..this is with or without oxygen? > > Without -- oxygen is a very difficult thing to manage in the eastern > half of the continent. I could purchase a portable oxygen system good > enough for me (not enough for pax) for less than USD 1,000 but almost ..you don't need it for your pax, just for your own night vision in a pinch, like when you find yourself burning reserve gas above some dead airport with no electricity except possibly your own magnetos. ..the exception for pax oxygen, would be if airliner pax helps out in SAR at night. > no FBOs could fill it for me -- out west, near the Rockies, oxygen is > a standard service, but not around here. That means that I'd have to > find a local oxygen supplier (a scuba shop? a welding supplier?) and ..scuba shops sells oxygen??? Welding oxygen _can_ be made pure enough, argon, nitrogen, and (up to 7%) CO2 etc is acceptable ;-), the eerie part is what else is in those welder bottles. > take the tank there after every few hours of use to have it refilled > -- you can see how that's a non-starter for long cross-country trips. ..oh yeah, I consider it an emergency tool to boost your night vision, _when_ you need it. > Here's something I'm curious about: since airliners typically > pressurize to about 7,000 ft but hypoxia can affect night vision even > at 5,000 ft, do airline pilots ever worry about this issue? ..well, oxygen is fed to pax thru constant flow masks while the cockpit crew uses on-deman masks, so that problem is solved, and if they need night vision, they can have it, AFAIK. Dave C, you have experience here, does airline pilots ever use oxygen to boost night vision? > I'm guessing not, because they always use approaches to land, and when > you're already lined up with the runway night vision isn't really an > issue. ..seeing the lights makes this a non-issue, but you _can_ see the "Osama prank potential" here. ;-) -- ..med vennlig hilsen = with Kind Regards from Arnt... ;-) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
