It's 12,500ft and 14,000ft for us in the US.----------------------------------------------------------------John MorganReal World: KGEG, UND Aerospace Spokane Satillite, Private ASEL 141.2 hrs, 314 landings, 46 inst. apprs.Virtual: MSFS 2004"There is a feeling about an airport that no other piece of ground can have. No matter what the name of the country on whose land it lies, an airport is a place you can see and touch that leads to a reality that can only be thought and felt." - The Bridge Across Forever: A Love Story by Richard Bach

>Infact I rather enjoyed some of the feeling it gives you, andWhat kind of feelings did you enjoy? How does it feel? And how different for different altitudes.

ROFLMAO!Johan[A HREF=http://jdserver.no-ip.com]Personal Server[/A]A LITTLE LESS CONVERSATION, AND A LITTLE MORE ACTION PLEASE!HELP:http://support.microsoft.com/?kbid=238882

I wrote MS along time ago about modeling hypoxia in FS. Just like how in fighter planes where it blacks and reds out in g pulls, FS could create tunnel vision or the gauges could start floating around or something. Would be a neat effect to remind users that there are limits in flight.Kilstorm

I do believe there are some gauges and at least one aircraft out there that models this. Do a search in the panels and gauges forum. This subject (modeling hypoxia in FS) has been discussed from time to time here.Thomas

In 1920, Rudolf Schroeder set a world altitude record in an open cockpit biplane, a Lapere Lusac 11, of 33,114 ft. He was using oxygen, but he ran out and attempted to switch oxygen bottles, but made the mistake of taking off his goggles - his eyes froze! He was unable to hook up the oxygen and quickly lost consciousness. The plane spun out of control and descended to a few thousand feet, where Rudolf came to and was able to recover and land, despite being almost blind.The aircraft, by the way, was powered by a Liberty 400 hp engine equipped with an experimental General Electric turbo supercharger.Dale

>At 16,000 ft you'll likely become disoriented, belligerent or>euphoric and completely lacking in rational judgement.>>Cal (CYXX)>Sounds like my mother-in-law at sea-level! lol lol

above 13k it gets hard.So up to 13k is eazy.Over 13k is a matter of how long you can hold your breath.

Or a Vickers Vimy which I have only just managed to get to 6000 ft.No problems running out of oxy on that old beast. :)

Yes, it depends entirely on the health and individual. Ive had "altitude sickness" and it is no pickic... In Breckenridge CO on a weeks vacation there. One thing we learned, stay away from all alcohol and caffine for at least a week before a visit to that altitude. We were walking all around town, and I began getting a severe headache, then was so sick that I could not finish dinner. The waitress noticed how bad I looked, and suggested that I go to a nearby doctors office. The doctor said a main cause for my problems was all the coffee I'd been drinking, in the three days drive we made getting there. Usually I stop every couple of hours for a break, usually involving coffee.It took me another two days to recover or feel normal, and that was only about 10,000 feet. By the end of the week had adjusted and we took a Jeep tour over the Continental Divide which was over 12,000 without probleems. Been back several times now, cutting out all coffee three days before leaving, result no problems at all.

>>>Yes, it depends entirely on the health and individual. Ive>had "altitude sickness" and it is no pickic... In>Breckenridge CO on a weeks vacation there. One thing we>learned, stay away from all alcohol and caffine for at least a>week before a visit to that altitude. >snipped>Been back several times now, cutting out all coffee three days>before leaving, result no problems at all. I believe I'm so use to mass amounts of coffee, that it no longer has any effects. It certainly won't ever keep me awake, and I don't seem to have altitude problems. But then I live at close to 5000' to start with.L.Adamson

The following are aviator tolerances as published by the FAA and are complied to by all commercial carriers.12,500 feet: No oxygen requiredAbove 12,500 feet and below 14,000 feet: Oxygen needed within one-half hour.Above 14,000 feet and below 15,000 feet: Crew required on oxygenAbove 15,000 feet: Crew and passengers required on oxygen. Half of the air in the atmosphere is below 18,000 feet.Hope this answers your question

> I live at close to 5000' to start with. Maybe I should move, am 1/2 mile from KFUL, at 98' and notice a difference in my breathing at Big Bear City when walking... Course I'm about 50lbs overweight, and 76 years, even though I still think I'm 25... Can't function the way I could then... but can still leg press 465 lbs... Climb the cliffs at San Onofre, etc...

So the people who climbed mt everest without oxygen were just crazy, lucky, or both?