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To: flyrotary@lancaironline.net
Subject: Re: [FlyRotary] Re: cowling protection
Date: Fri, 28 Sep 2007 13:09:30 -0400
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John, any slightly separated shield will help. If you must use the mat type use one with a reflective foil on the inside and the matting against the cowl. Soemtimes that is the best you can do. Try to circulate some?air in there if possible.
Bill


-----Original Message-----
From: John Downing <downing.j@sbcglobal.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 27 Sep 2007 5:37 pm
Subject: [FlyRotary] Re: cowling protection



Bill,? I have 2 tight 90 degree turns that I cut out of a SS donut.? For the short term, like until next January, I could use some temporary protection.? I looked at the Power Sport installation two years back and they used a complete shield on the exhaust pipe and it will take a lot of time to fabricate.? Was hoping to fly soon and finish the detail things next winter when the snow gets deep.? JohnD


----- Original Message ----- 

From: WRJJRS@aol.com 

To: Rotary motors in aircraft 

Sent: Thursday, September 27, 2007 12:29 AM

Subject: [FlyRotary] Re: cowling protection





In a message dated 9/26/2007 6:05:38 PM Pacific Standard Time, downing.j@sbcglobal.net writes:


What is the rule of thumb for the heat shield between the exhaust pipe? and the cowling.? I have fiberfrax to glue on and planned on covering it with .016 SS, the pipe is 2 1/2 SS, do I need a shield 5 inches wide?? Thankyou JohnD?





John, insulation is a good idea but the best way to prevent radiated heat is to use a heat sheld. The more space you can give it (on BOTH sides) the better. Feeding a small air bleed in the area to cary off the heat is also a good idea. The air bleed doesn't have to be big, it just has to keep the air moving.

Bill Jepson




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<FONT face=Tahoma></FONT>John, any slightly separated shield will help. If you must use the mat type use one with a reflective foil on the inside and the matting against the cowl. Soemtimes that is the best you can do. Try to circulate some&nbsp;air in there if possible.<br>
Bill<br>
<br>
<br>
-----Original Message-----<br>
From: John Downing &lt;downing.j@sbcglobal.net&gt;<br>
To: Rotary motors in aircraft &lt;flyrotary@lancaironline.net&gt;<br>
Sent: Thu, 27 Sep 2007 5:37 pm<br>
Subject: [FlyRotary] Re: cowling protection<br>
<br>


<div id=AOLMsgPart_2_5245b6d5-d56a-41fc-b51d-77ac2568c4d4>

<div>Bill,&nbsp; I have 2 tight 90 degree turns that I cut out of a SS donut.&nbsp; For the short term, like until next January, I could use some temporary protection.&nbsp; I looked at the Power Sport installation two years back and they used a complete shield on the exhaust pipe and it will take a lot of time to fabricate.&nbsp; Was hoping to fly soon and finish the detail things next winter when the snow gets deep.&nbsp; JohnD</div>

<BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">

<div style="FONT: 10pt arial">----- Original Message ----- </div>


<div style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=WRJJRS@aol.com href="mailto:WRJJRS@aol.com">WRJJRS@aol.com</A> </div>


<div style="FONT: 10pt arial"><B>To:</B> <A title=flyrotary@lancaironline.net href="mailto:flyrotary@lancaironline.net">Rotary motors in aircraft</A> </div>


<div style="FONT: 10pt arial"><B>Sent:</B> Thursday, September 27, 2007 12:29 AM</div>


<div style="FONT: 10pt arial"><B>Subject:</B> [FlyRotary] Re: cowling protection</div>


<div><br>
</div>
<FONT id=role_document face=Arial color=#000000 size=2>

<div>

<div>In a message dated 9/26/2007 6:05:38 PM Pacific Standard Time, <A href="mailto:downing.j@sbcglobal.net">downing.j@sbcglobal.net</A> writes:</div>

<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>

<div><FONT face=Arial size=2>What is the rule of thumb for the heat shield between the exhaust pipe&nbsp; and the cowling.&nbsp; I have fiberfrax to glue on and planned on covering it with .016 SS, the pipe is 2 1/2 SS, do I need a shield 5 inches wide?&nbsp; Thankyou JohnD&nbsp;</FONT></div>
</FONT></BLOCKQUOTE></div>


<div></div>


<div>John, insulation is a good idea but the best way to prevent radiated heat is to use a heat sheld. The more space you can give it (on BOTH sides) the better. Feeding a small air bleed in the area to cary off the heat is also a good idea. The air bleed doesn't have to be big, it just has to keep the air moving.</div>


<div>Bill Jepson</div>
</FONT><br>
<br>
<br>


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