Originally Posted by Snowflake
Okay, thinking outside the box here... How about just running the finer O2 lines that you typically find in GA O2 systems up the Jet mask hose, and fitting a cannula into the jet mask somehow, so it fits into your nose when the mask is on?
Heck, someone could even 3D print a custom cannula to fit into the front of the jet mask...
That would allow you to use an O2-saving GA system, *and* look like a fighter jock...
I suggested that, in this thread, a few posts before this one:
"What would be the available O2 at your nose if you ran a modern small flexible hose up through the large mask hose and then placed the cannula across the mask roughly under your nose?"
And then I posed questions about the idea such as:
"Would you get enough O2? The two outlets of the cannula are not necessarily positioned where they would be if you wore it as designed - maybe an inch away. But then you have the enclosure of the mask to trap unused O2.
But then you are also exhaling through the mask which blows both exhalent and unused O2 out the mask. You can remove the valves so that there's a clear path out."
And then I proposed a couple of ground and an air test.
"Take PO reading without mask
Put mask on, turn on O2, Take PO readings a (?) intervals.
If that's safe then I would take it up to (?) feet and run the same test."
Maybe there are better tests to be made.
This system would not keep smoke out unless the larger diameter tube was closed off, and you kept the check vales in place.