"The oxygen supply is from a low-pressure system with a new American demand valve. During the trials this was not entirely satisfactory, and the majority of flying was limited to 30,000 feet as the flow above this height was unreliable; it is understood that a modified valve system is soon to be available. There is an aneroid control which relieves the pilot of the necessity of increasing the flow with altitude, and an indicator on the dashboard to show the oxygen delivery as each breath is taken. In an emergency the pilot can obtain pure oxygen, in which case the total amount takes 45 minutes to consume."
http://www.wwiiaircraftperformance.org/p-47/p-47c-afdu.html"It is believed that the Combat Air Patrol should be placed at such an altitude that the pilots are not required to use oxygen while on patrol. It is felt that 10,000 feet is a satisfactory altitude, for from there they can be vectored out satisfactorily to intercept either low or high flying bogies. It has the additional advantage of being less tiring on the pilot, as he is more comfortable at a lower altitude and is not inconvenienced by having to wear an oxygen mask. In addition, too much time is wasted in having a CAP come down from 18,000 feet by the controlling fighter director. A low flying bogey was picked up and part of the CAP had to be brought down to investigate. By the time they got down the bogey had disappeared off the screen. The Yorktown maintained her CAP at 10,000 feet and successfully intercepted all bogies except for the one mentioned above."
http://www.history.navy.mil/docs/wwii/mid7.htm"The extremely high altitude required of a typical reconnaissance flight held other unique challenges. Prior to the war, very few pilots had any experience flying above 20,000 feet. [61] At 35,000 feet, the new reconnaissance pilot suddenly found himself trying to manipulate aircraft controls in a sub-arctic environment where the temperature could easily fall to 50 degrees below zero. Pilots often wore so many layers of clothing that they had to be hoisted into the aircraft by helpful ground crews. [62] Oxygen deprivation was another constant hazard of high altitude flight. Oxygen masks and filtration systems were very primitive in 1940, and hypoxia, a loss of consciousness or coherence due to oxygen deprivation, was a very real danger. [63] If the cold and altitude sickness weren’t enough, an even greater peril of high altitude missions was the condensation trail that could appear at any time behind the aircraft. A contrail sent an open invitation to enemy fighters. If an air predator could not climb to reconnaissance altitude in time to engage, it would certainly be waiting on the return flight. Reconnaissance pilots even attached mirrors to their canopies in order to spot the dreaded contrails and drop below condensation altitude as quickly as possible in order to dissipate the telltale white ribbon dragging behind the aircraft. [64] "
http://www.militaryhistoryonline.com/wwii/articles/airrecon.aspxHaving referenced such .... is modeling oxygen systems and hypoxia necessary to the game? Mnoooo. Should it be implemented in the Main if it's implemented in AvA or for events? Probably not. Is it something that HTC could possibly model without an extreme amount of effort? I'm of the opinion that this may be one of the easier requests but ... honestly .... until I have the skill or opportunity to fill those shoes - I really don't know.
