The experienced Cozy flyers strongly recommend an O2 system - the plane does very well flying at altitudes of 8,000 - 16,000. Flying in the southern Rockies I learned that I get headaches starting at 8,000 and that was 20 years ago. So, some kind of O2 system goes with the airplane's mission.

I installed a cylinder bracket in the right side strake. The bracket is positioned so that an E / M-24 cylinder can be accessed and controlled by either copilot or by the pilot reaching across an empty seat. The bracket is secured by 10-32 clickbond studs, and the bottle is held to the bracket by 3" seatbelt webbing. I also have C / M-9 cylinders that can be carried in a shoulder bag and hung over the co-pilot headrest. Matched to a pneumatic conservator, the two sizes should be sufficient for 25 and 9 hours of supplemental O2, respectively. A fingertip device will track O2 saturation, and the flow rates will be adjusted to maintain saturation at or above 93.