One thing i've noticed is that in most of the plane addons out there today they either make you put on your oxygen or pressurize the cabin at about 8k-10k feet, now my question is .. how come ww1 pilots managed to get to 20kish feet (later in the war) without it? was it just that it took them so long to get to that hieght and the body got used to it? the fact they where in an open cockpit and not in a greenhouse? should the "you must your oxygen on before 11k ft or you pass out and die!" be tweaked??
Why the question?? cos i keep forgetting to turn the rudy oxygen on!