Its a good question and something that has had a bit of a study in various
scenarios,
yet not anything that in depth.
The attached image provides some indication however the free stream through the
cabin is fairly slow, and its folding over and back upon itself constantly.
There is no discernible difference in actual ambient pressure to that which is
external being detected.
Most of the ingress comes from the side vents and center control cutouts. In
standard
trim, on the Classic, the air then finds its way down through the fuel
tap well, under the tank and then rearward out through the Hstab slots and
rudder
cable tubes. If the original Classic rail wheel port is still available the
air exits through there as well.
At this stage its unclear whether or not the flap bar slots are acting as
ingress
or egress. I am suspecting the former due to the positioning of the engine
tail pipe on 181 and the noticeable headaches developing after longer back to
back flights over more than two days. So my CO detector needs to be switched on
now that the door seals are working affectively.
Based upon the trajectory and velocity of external free stream air I would
expect
absent door seals to allow air to flow out more rather than in, and I could
be totally wrong also. A reverse naca vent would assist interior flow velocity
somewhat as would some way for cabin air to traverse the D panel; this would
probably have the most affect on uniform airflow through the cabin in flight.
Its a subject that requires more time.
That's all I can offer right now, bit busy with other stuff for a bit.
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