X-Virus-Scanned: clean according to Sophos on Logan.com
Return-Path: <rwstracy@gmail.com>
Received: from an-out-0708.google.com ([209.85.132.240] verified)
  by logan.com (CommuniGate Pro SMTP 5.1.12)
  with ESMTP id 2359222 for flyrotary@lancaironline.net; Sat, 29 Sep 2007 12:08:30 -0400
Received-SPF: pass
 receiver=logan.com; client-ip=209.85.132.240; envelope-from=rwstracy@gmail.com
Received: by an-out-0708.google.com with SMTP id b2so439519ana
        for <flyrotary@lancaironline.net>; Sat, 29 Sep 2007 09:07:51 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=beta;
        h=domainkey-signature:received:received:message-id:date:from:sender:to:subject:in-reply-to:mime-version:content-type:references:x-google-sender-auth;
        bh=9ZMCM244hy6JUqQNfLFoxuCaTh/4LfNPBvO5ijSO1QM=;
        b=YwRTgGy/k2d7AZTUcFGBQ6ADiXfm6U5eVLqbsVZz0uorzd7U6nEoV3APIPp4LBBVpKlgbrUatbxZEVsRloQBBjc1HlUarWp7pCnj3ahpRS6y3aRb2V6ihdJPmwyFZXUXdjnUxioyhsz1kAWIuURQVm461aF53Zq2GeetpAhJW1Q=
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=beta;
        h=received:message-id:date:from:sender:to:subject:in-reply-to:mime-version:content-type:references:x-google-sender-auth;
        b=SAUDhczc2zRvFEfR/TqbY/pDGVwt+CsB5LqJl0Dz2eTwMUdiS2jRTJK97GVVBGPllKllr13gNTyxCRj8adCalQUkwQ391d+ehvkxgpD02Lwe6F70/DK3LwGOGloIXVQzFSCDbyw94cBcvcnJlw63R8NzIfFQqA6OMJByvAI+1X4=
Received: by 10.90.118.8 with SMTP id q8mr1955333agc.1191082068976;
        Sat, 29 Sep 2007 09:07:48 -0700 (PDT)
Received: by 10.143.28.1 with HTTP; Sat, 29 Sep 2007 09:07:48 -0700 (PDT)
Message-ID: <1b4b137c0709290907u58d387a6o9f6b6c73e1498a0c@mail.gmail.com>
Date: Sat, 29 Sep 2007 12:07:48 -0400
From: "Tracy Crook" <tracy@rotaryaviation.com>
Sender: rwstracy@gmail.com
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Mark's flight testing..
In-Reply-To: <list-2354250@logan.com>
MIME-Version: 1.0
Content-Type: multipart/alternative; 
	boundary="----=_Part_4925_20097693.1191082068921"
References: <list-2354250@logan.com>
X-Google-Sender-Auth: edbe7e1c53fc0c6d

------=_Part_4925_20097693.1191082068921
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

Larger exit is one thing but has anybody had significant cooling improvement
with a cowl flap?  When I tried it on the -4 it didn't do any good and I
can't recall one that did.  I'm going to put one on the RV-8 but only to
INCREASE temps in cold weather and high altitudes (and decrease drag).

BTW, the best exit mod I did was to streamline the outlet nozzle (eliminate
sharp turns & corners) but left it the same size.  This alone dropped my
temps 6 deg. F. (which is a BIG deal, every degree improvement seems to be a
struggle).

Tracy


On 9/27/07, David Staten <Dastaten@earthlink.net> wrote:
>
> Mark Steitle wrote:
>
> >   It appears that I need more cowl exit area.  Stay tuned.  I'm still
> > working on this one.
>
>
> I wont be surprised if we need more as well. We've got twice the normal
> inlet area at the moment - with armpits AND NACA's available to us for
> use. All of it leaving a stock exit out the back of the cowl. We MAY
> need a cowl flap of sorts for VX/VY ops and once in cruise, close them
> up.But Chris has a good point - dont cut any holes in the cowl unless or
> until we know we need them.
>
> Keep up the good work, mark
>
> Dave
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

------=_Part_4925_20097693.1191082068921
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

<div>Larger exit is one thing but has anybody had significant cooling improvement with a cowl flap?&nbsp; When I tried it on the -4&nbsp;it didn&#39;t do any good and I can&#39;t recall one that did.&nbsp; I&#39;m going to put one on the RV-8 but only to INCREASE temps in cold weather and high altitudes (and decrease drag).
</div>
<div>&nbsp;</div>
<div>BTW, the best exit mod I did was to streamline the outlet nozzle (eliminate sharp turns &amp; corners) but left it the same size.&nbsp; This alone dropped my temps 6 deg. F. (which is a BIG deal, every degree improvement seems to be a struggle).
</div>
<div>&nbsp;</div>
<div>Tracy<br><br>&nbsp;</div>
<div><span class="gmail_quote">On 9/27/07, <b class="gmail_sendername">David Staten</b> &lt;<a href="mailto:Dastaten@earthlink.net">Dastaten@earthlink.net</a>&gt; wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Mark Steitle wrote:<br><br>&gt;&nbsp;&nbsp; It appears that I need more cowl exit area.&nbsp;&nbsp;Stay tuned.&nbsp;&nbsp;I&#39;m still<br>
&gt; working on this one.<br><br><br>I wont be surprised if we need more as well. We&#39;ve got twice the normal<br>inlet area at the moment - with armpits AND NACA&#39;s available to us for<br>use. All of it leaving a stock exit out the back of the cowl. We MAY
<br>need a cowl flap of sorts for VX/VY ops and once in cruise, close them<br>up.But Chris has a good point - dont cut any holes in the cowl unless or<br>until we know we need them.<br><br>Keep up the good work, mark<br><br>
Dave<br><br>--<br>Homepage:&nbsp;&nbsp;<a href="http://www.flyrotary.com/">http://www.flyrotary.com/</a><br>Archive and UnSub:&nbsp;&nbsp; <a href="http://mail.lancaironline.net:81/lists/flyrotary/List.html">http://mail.lancaironline.net:81/lists/flyrotary/List.html
</a><br></blockquote></div><br>

------=_Part_4925_20097693.1191082068921--