A quickie sketch at lunch time.
Just a small ramp fabbed and then tapered to clear the flap may draw a bit
of air out of these rather ugly gaps in the aircraft side. However ugly th
ese slots may appear to be, and we do pretty them up slightly, but it makes
for expedient construction and my thought was it may be a useable exit for
cockpit air ventilation.
The ramp will have to clear the lower edge of the flap as it extends initia
lly so on my plane 5mm may be maximum height. I'm thinking I may just do a
quick photo, and 3D print a rough ramp so it can be tapped in place (3M st
icky two sided tape most likely to preserve my patience.) I would think ju
st stick it on and go fly. Put a small pressure sensor / Arduino and check
outside pressure vs inside pressure to determine the effectiveness.
Personally, my pressure vents are fine except for the pilot side NACA which
is too low and allows exhaust fumes to enter when climbing from 75-90 Knot
s climb speeds. At cruise my pilot side NACA duct is free of exhaust fumes
. I'm thinking longer exhaust pipe. Time and energy permitting of course.
That thinkin stuff will get you in trouble.
Bud Yerly
-----Original Message-----
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matr
onics.com> On Behalf Of Area-51
Sent: Friday, August 25, 2023 11:04 AM
Subject: Europa-List: Re: Cabin fresh air exhaust
>
Do a quick explanation sketch Bud.
Played with this a bit more today by adding an additional belly vent aft of
the curtis valves; then another pair of vents just below the leading edge
of the Hstab; then added a passage through the D panel.
The top mounted exit vent provides the most volume flow through the entry v
ents into the cabin. However eliminating both top and belly exit vents and
retaining the D panel port and rear exit vents provides a more uniform flow
and less disturbance to exterior free stream air upon exit.
The model being tested has the flap bar slots blocked off; there would norm
ally be air exiting or entering from this area; which is possibly where CO
is getting in from prop swirl turbulence.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511346#511346
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