Today's Message Index:
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1. 04:16 PM - Re: Re: Cabin fresh air exhaust (William Daniell)
2. 06:29 PM - Re: Cabin fresh air exhaust (Area-51)
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| Subject: | Re: Cabin fresh air exhaust |
N460HJ cabin exhaust...the fuel tank outlet covers
\[image: image.png]
[image: image.png]
William Daniell
LONGPORT
+1 786 878 0246
On Fri, Aug 25, 2023 at 6:52=AFPM Pete <peterz@zutrasoft.com> wrote:
>
> Area of the bulkhead slot isnt any smaller than my existing reverse naca
> behind the doors fwiw.
>
> > On Aug 25, 2023, at 6:40 PM, Area-51 <goldsteinindustrial@gmail.com>
> wrote:
> >
> goldsteinindustrial@gmail.com>
> >
> > Peter the trim slots are shielded by a forward bulkhead feature on 181,
> so air flow to these slots is very limited.
> >
> > Implementing rear side exhaust ports near the Hstab has its own set of
> challenges and issues regarding structural integrity and fatigue of the
> Hstab root area.
> >
> > Some tricky "multi-phase" solutions are required on this subject to
> factor in prop swirl and exhaust gas paths from the engine's tail pipe;
> which means a "press Solve button and go to bed" situation.
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=511352#511352
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
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Message 2
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| Subject: | Re: Cabin fresh air exhaust |
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
Attachments:
http://forums.matronics.com//files/16bfd664_bdaa_4d3e_8b23_072a1eb9b651_160.jpeg
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