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Date: Mon, 24 Dec 2012 09:12:14 -0600
Message-ID: <CAHh3jbMVJn0YpzF4MXmZ6AYjP+HpP_x53jVG=HttP33tksxLpw@mail.gmail.com>
Subject: Re: [FlyRotary] Cooling Duct design
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=047d7b10c7d349f4df04d19a9ff5

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Hi Steve,

Referring to the top view drawing, my guess is the majority of the air
would favor the top half of the core, starving the other half of air.  I
think I would try to duplicate the long curved duct wall on both sides,
forming a trumpet shape nearest the core.  On the side-view drawing, my
guess is the majority of the cooling air would pile up on the back/downwind
side.  I would squeeze it down to almost nothing at the backside.  Then
take some manometer readings and adjust as appropriate.

Be sure you have free space behind the radiator for the air to exit the
core, and adequate cowl opening(s).  I had to add a cowl flap to my
Lancair, but it really helps during hot weather climb-outs.  When up into
cooler air I usually close the cowl flap for reduced cooling drag.

Mark S.
Lancair ES - PP 20B - 258 hrs

On Mon, Dec 24, 2012 at 1:32 AM, Stephen Izett <steveizett@me.com> wrote:

> Hi Guys
>
> I'm about to construct the diffuser for the water exchanger.
> Can some of you guys with operating setups critique the design please.
> So it consists of a K&Mish diffuser followed by a wedge.
>
>
>
> And a happy Christmas to you all.
>
> Steve Izett
> Perth Western Australia
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>

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Hi Steve,=A0<div><br></div><div>Referring to the top view drawing, my guess=
 is the majority of the air would favor the top half of the core, starving =
the other half of air. =A0I think I would try to duplicate the long curved =
duct wall on both sides, forming a trumpet shape nearest the core. =A0On th=
e side-view drawing, my guess is the majority of the cooling air would pile=
 up on the back/downwind side. =A0I would squeeze it down to almost nothing=
 at the backside. =A0Then take some manometer readings and adjust as approp=
riate. =A0</div>
<div><br></div><div>Be sure you have free space behind the radiator for the=
 air to exit the core, and adequate cowl opening(s). =A0I had to add a cowl=
 flap to my Lancair, but it really helps during hot weather climb-outs. =A0=
When up into cooler air I usually close the cowl flap for reduced cooling d=
rag.</div>
<div><br></div><div>Mark S.</div><div>Lancair ES - PP 20B - 258 hrs =A0=A0<=
br><br><div class=3D"gmail_quote">On Mon, Dec 24, 2012 at 1:32 AM, Stephen =
Izett <span dir=3D"ltr">&lt;<a href=3D"mailto:steveizett@me.com" target=3D"=
_blank">steveizett@me.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Hi Guys<br>
<br>
I&#39;m about to construct the diffuser for the water exchanger.<br>
Can some of you guys with operating setups critique the design please.<br>
So it consists of a K&amp;Mish diffuser followed by a wedge.<br>
<br><br>
<br>
And a happy Christmas to you all.<br>
<br>
Steve Izett<br>
Perth Western Australia<br>
<br>--<br>
Homepage: =A0<a href=3D"http://www.flyrotary.com/" target=3D"_blank">http:/=
/www.flyrotary.com/</a><br>
Archive and UnSub: =A0 <a href=3D"http://mail.lancaironline.net:81/lists/fl=
yrotary/List.html" target=3D"_blank">http://mail.lancaironline.net:81/lists=
/flyrotary/List.html</a><br>
<br></blockquote></div><br></div>

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