X-Virus-Scanned: clean according to Sophos on Logan.com
Return-Path: <WRJJRS@aol.com>
Received: from imo-m21.mx.aol.com ([64.12.137.2] verified)
  by logan.com (CommuniGate Pro SMTP 5.2.11)
  with ESMTP id 3412043 for flyrotary@lancaironline.net; Mon, 05 Jan 2009 17:07:28 -0500
Received: from WRJJRS@aol.com
	by imo-m21.mx.aol.com  (mail_out_v39.1.) id q.c28.4abd1513 (37036)
	 for <flyrotary@lancaironline.net>; Mon, 5 Jan 2009 17:07:16 -0500 (EST)
Received: from smtprly-db01.mx.aol.com (smtprly-db01.mx.aol.com [205.188.249.152]) by cia-db02.mx.aol.com (v121_r5.5) with ESMTP id MAILCIADB026-5bc34962848b33c; Mon, 05 Jan 2009 17:07:15 -0500
Received: from WEBMAIL-MB06 (webmail-mb06.webmail.aol.com [64.12.170.154]) by smtprly-db01.mx.aol.com (v121_r5.5) with ESMTP id MAILSMTPRLYDB012-5bc34962848b33c; Mon, 05 Jan 2009 17:07:07 -0500
References: <list-3411982@logan.com>
To: flyrotary@lancaironline.net
Subject: Re: [FlyRotary] Re: 20B install issues overcome
Date: Mon, 05 Jan 2009 17:07:07 -0500
X-AOL-IP: 66.253.96.220
In-Reply-To: <list-3411982@logan.com>
X-MB-Message-Source: WebUI
MIME-Version: 1.0
From: wrjjrs@aol.com
X-MB-Message-Type: User
Content-Type: multipart/alternative; 
 boundary="--------MB_8CB3D99155AA52A_774_24C7_WEBMAIL-MB06.sysops.aol.com"
X-Mailer: AOL Webmail 40627-STANDARD
Received: from 66.253.96.220 by WEBMAIL-MB06.sysops.aol.com (64.12.170.154) with HTTP (WebMailUI); Mon, 05 Jan 2009 17:07:07 -0500
Message-Id: <8CB3D991549F4C2-774-11F7@WEBMAIL-MB06.sysops.aol.com>
X-Spam-Flag:NO


----------MB_8CB3D99155AA52A_774_24C7_WEBMAIL-MB06.sysops.aol.com
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="us-ascii"

George,
That might have been a problem with the old carburettor fed rotarys, and in fact they ran a thermal reactor on the early ones.?With modern EFI and even lean of peak operation and closed loop O2 sensor operation?that shouldn't be a problem. When the O2 sensor is used the idea is to be SURE there isn't any O2 left, but more important that there isn't any FUEL left. The O2 sensor is really an unburned fuel sensor that just works backwards since it is easier to sense oxygen than any of the other exhaust gasses. Without fuel to ignite what is going to burn?
Bill Jepson


-----Original Message-----
From: George Lendich <lendich@optusnet.com.au>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 5 Jan 2009 1:09 pm
Subject: [FlyRotary] Re: 20B install issues overcome



Bill,

I had a talk with Mistral a while back and the chief engineer had some concerns with introducing fresh air into the exhaust ( for cooling) as it might initiate burning of residual fuel - hence more heat rather than less heat.

That's why their cool tube (over the exhaust tube) is discharged separate to the exhaust.

Although I intend to proceed with out original design just to see the results.

Do you have any comments on this ?

George (down under)

Earnest,
I believe that the SuperTrapp muffler is an example of a band gap device and it worked well, if properly tuned.
I think the large block idea has merit too, but you will have to allow enough thickness to prevent the tubes that see the exhaust first to fight the harmonic vibration and heat. Different size diamonds in the exhaust stream might also help fight harmonics.
Bill Jepson




Get a free MP3 every day with the Spinner.com Toolbar. Get it Now. 



----------MB_8CB3D99155AA52A_774_24C7_WEBMAIL-MB06.sysops.aol.com
Content-Transfer-Encoding: 7bit
Content-Type: text/html; charset="us-ascii"

George,<br>
That might have been a problem with the old carburettor fed rotarys, and in fact they ran a thermal reactor on the early ones.&nbsp;With modern EFI and even lean of peak operation and closed loop O2 sensor operation&nbsp;that shouldn't be a problem. When the O2 sensor is used the idea is to be SURE there isn't any O2 left, but more important that there isn't any FUEL left. The O2 sensor is really an unburned fuel sensor that just works backwards since it is easier to sense oxygen than any of the other exhaust gasses. Without fuel to ignite what is going to burn?<br>
Bill Jepson<br>
<br>
<br>
-----Original Message-----<br>
From: George Lendich &lt;lendich@optusnet.com.au&gt;<br>
To: Rotary motors in aircraft &lt;flyrotary@lancaironline.net&gt;<br>
Sent: Mon, 5 Jan 2009 1:09 pm<br>
Subject: [FlyRotary] Re: 20B install issues overcome<br>
<br>


<div id=AOLMsgPart_2_e3337d5f-7742-4e17-9910-605958f063d4>

<div><FONT face=Arial size=2>Bill,</FONT></div>


<div><FONT face=Arial size=2>I had a talk with Mistral a while back and the chief engineer had some concerns with introducing fresh air into the exhaust ( for cooling) as it might initiate burning of residual fuel - hence more heat rather than less heat.</FONT></div>


<div><FONT face=Arial size=2>That's why their cool tube (over the exhaust tube) is discharged separate to the exhaust.</FONT></div>


<div><FONT face=Arial size=2>Although I intend to proceed with out original design just to see the results.</FONT></div>


<div><FONT face=Arial size=2>Do you have any comments on this ?</FONT></div>


<div><FONT face=Arial size=2>George (down under)</FONT></div>

<BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">Earnest,<br>
I believe that the SuperTrapp muffler is an example of a band gap device and it worked well, if properly tuned.<br>
I think the large block idea has merit too, but you will have to allow enough thickness to prevent the tubes that see the exhaust first to fight the harmonic vibration and heat. Different size diamonds in the exhaust stream might also help fight harmonics.<br>
Bill Jepson<br>
<br>
<br>


<div class=aol_ad_footer id=MAILCIADA031-5c5e4962644ddf><br>
<FONT style="FONT: 10pt ARIAL, SAN-SERIF; COLOR: black">
<HR style="MARGIN-TOP: 10px">
Get a <B>free MP3</B> every day with the Spinner.com Toolbar. <A href="http://toolbar.aol.com/spinner/download.html?ncid=emlweusdown00000020" target=_blank>Get it Now</A>. </div>
</BLOCKQUOTE></FONT></div>
<!-- end of AOLMsgPart_2_e3337d5f-7742-4e17-9910-605958f063d4 --><div id='MAILCIADB026-5bc34962848b33c' class='aol_ad_footer'><BR/><FONT style="color: black; font: normal 10pt ARIAL, SAN-SERIF;"><HR style="MARGIN-TOP: 10px"></HR>Get a <b>free MP3</b> every day with the Spinner.com Toolbar. <a href="http://toolbar.aol.com/spinner/download.html?ncid=emlweusdown00000020">Get it Now</a>. </div>

----------MB_8CB3D99155AA52A_774_24C7_WEBMAIL-MB06.sysops.aol.com--