This reminds me of something I was told about light aircraft heater muffs.
It turns out that the muff is warmed by exhaust gases coming from the piston
engine which vent directly into the cabin. Oops, meant the warmed air,
not the exhaust gases.
I remember thinking at the time Holy Cow that sounds dangerous! You
normally use heater muffs when it is cold, which generally means the cabin is
closed up. If the muff has a leak, how quickly you figure CO will fill the cabin.
Also piloting skill has a strong tendency to decrease when you pass out...well
except for Corky Jr of course
