This is proofing a hot topic!!
So, Pete you are correct, I checked the model again, there is a slot in the
bulkhead
that allows air to flow through to the Hstab trim slots. The trim servo
arm operates through it. With or without a port in the cabin D panel doesn't
appear
to make any difference, the air gets trapped in an internal vortex. So some
additional work required here to help it flow out. My initial thoughts way
back was to fit bristle brush wall to eliminate acoustic noise from this
feature.
Somebody just posted pics of curtis valve covers. Minimal air does flow from
here,
and the volume is not high enough to adversely affect cabin flow.
I ran the model again in standard trim with the flap bar slots exposed. Air does
flow through here much better when the D panel port is implemented. 181 has
a flat panel piece fitted at the bottom throw position of the slot that helps
to draw air out into the free stream. Elimination the flap bar slot has a marked
affect on cabin air ingress volume however the greatest affect so far has been
the top position aft of the doors.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511368#511368
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