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 these
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 initially
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 sticky two
sided tape most likely to preserve my patience.) I would think just 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 Knots 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@matronics.com> On Behalf Of Area-51
Sent: Friday, August 25, 2023 11:04 AM
To: europa-list@matronics.com
Subject: Europa-List: Re: Cabin fresh air exhaust
--> Europa-List message posted by: "Area-51" <goldsteinindustrial@gmail.com>
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 vents
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 normally
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
Attachments:
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http://forums.matronics.com//files/e4802158_03c5_407b_85b5_e685cf82039d_788.jpeg
Flap Drive Hole Modification.png
Description: Flap Drive Hole Modification.png
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