X-Virus-Scanned: clean according to Sophos on Logan.com
Return-Path: <BMears9413@aol.com>
Received: from imo-m21.mx.aol.com ([64.12.137.2] verified)
  by logan.com (CommuniGate Pro SMTP 5.2c1)
  with ESMTP id 2463538 for flyrotary@lancaironline.net; Fri, 09 Nov 2007 12:00:11 -0500
Received-SPF: pass
 receiver=logan.com; client-ip=64.12.137.2; envelope-from=BMears9413@aol.com
Received: from BMears9413@aol.com
	by imo-m21.mx.aol.com (mail_out_v38_r9.3.) id q.c89.197b2667 (48336)
	 for <flyrotary@lancaironline.net>; Fri, 9 Nov 2007 11:59:27 -0500 (EST)
Received: from WEBMAIL-MA14 (webmail-ma14.webmail.aol.com [64.12.88.78]) by ciaaol-d01.mail.aol.com (v120.9) with ESMTP id MAILCIAAOLD016-bcd0473491ef1f; Fri, 09 Nov 2007 11:59:27 -0400
References: <list-2463531@logan.com>
To: flyrotary@lancaironline.net
Subject: Re: [FlyRotary] Re: Spin Tech
Date: Fri, 09 Nov 2007 11:59:27 -0500
In-Reply-To: <list-2463531@logan.com>
X-MB-Message-Source: WebUI
MIME-Version: 1.0
From: bmears9413@aol.com
X-MB-Message-Type: User
Content-Type: multipart/alternative; 
 boundary="--------MB_8C9F1090570F849_7D4_14FB_WEBMAIL-MA14.sysops.aol.com"
X-Mailer: AOL WebMail 31361-STANDARD
Received: from 65.182.71.8 by WEBMAIL-MA14.sysops.aol.com (64.12.88.78) with HTTP (WebMailUI); Fri, 09 Nov 2007 11:59:27 -0500
Message-Id: <8C9F1090570F849-7D4-A58@WEBMAIL-MA14.sysops.aol.com>
X-AOL-IP: 64.12.88.78
X-Spam-Flag: NO


----------MB_8C9F1090570F849_7D4_14FB_WEBMAIL-MA14.sysops.aol.com
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="us-ascii"

I built mine from inconel and 321 stainless, then jet coated it. If that dont handle the heat Im just screwed!

Bob Mears
Supermarine spitfire


-----Original Message-----
From: M Roberts <montyr2157@alltel.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, 9 Nov 2007 10:44 am
Subject: [FlyRotary] Re: Spin Tech




Ed,

? Is there any consensus at this time as to which alloy (304 or 409) is the most 

durable for our hot breathed 13B rotarys ??

--
Kelly Troyer 
"Dyke Delta"_13B ROTARY Engine 
"RWS"_RD1C/EC2/EM2 
"Mistral"_Backplate/Oil Manifold 

?

Kelly,

?

I'm not Ed but I did sleep at a Holiday Inn Express!!

?

Alloys to use for Rotary engine exhaust in order of decreasing desirability (and cost)

?

1.) Inconel

?

2.) 321 Stainless

?

3.) 304 Stainless

?

4.) 409 Stainless

?

5.) Mild steel

?

?

Basically 409 is a low chromium stainless designed for the automotive market, specifically for exhaust tubing. It does not polish well and will develop a protective coating of rust. It will live just fine, but will be less attractive.

?

If you move up in cost you get a higher chromium and nickel content and therefore a higher temp resistance and creep resistance. This means you can make everything lighter and thinner. Of course it becomes much more important to properly design the manifold for expansion/thermal cycling loads the thinner it gets. So? you will have to put a lot of slip joints and metal bellows in it to seal it up if it is a turbo installation. So.....how much do you want to spend to save 5 lbs or have a?polished tail pipe?is the question.

?

Mild steel will work fine if it is thick enough. Especially if you coat it with ceramic. I suppose you could also coat the 409 stainless with ceramic if you want a nice finish, but it might be less expensive?to just use 304 at that point.

?

Monty 



________________________________________________________________________
Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail.aol.com

----------MB_8C9F1090570F849_7D4_14FB_WEBMAIL-MA14.sysops.aol.com
Content-Transfer-Encoding: 7bit
Content-Type: text/html; charset="us-ascii"

I built mine from inconel and 321 stainless, then jet coated it. If that dont handle the heat Im just screwed!<br>
<br>
Bob Mears<br>
Supermarine spitfire<br>
<br>
<br>
-----Original Message-----<br>
From: M Roberts &lt;montyr2157@alltel.net&gt;<br>
To: Rotary motors in aircraft &lt;flyrotary@lancaironline.net&gt;<br>
Sent: Fri, 9 Nov 2007 10:44 am<br>
Subject: [FlyRotary] Re: Spin Tech<br>
<br>


<div id=AOLMsgPart_2_2455ed4b-b637-404f-ac2c-0c54f19d26f8>

<div>

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


<div><FONT face=Arial size=2>&nbsp; Is there any consensus at this time as to which alloy (304 or 409) is the most </FONT></div>


<div><FONT face=Arial size=2>durable for our hot breathed 13B rotarys ??</FONT></div>


<div class=signature id=signature><FONT face=Arial size=2>--<br>
Kelly Troyer <br>
"Dyke Delta"_13B ROTARY Engine <br>
"RWS"_RD1C/EC2/EM2 <br>
"Mistral"_Backplate/Oil Manifold </FONT></div>


<div class=signature><FONT face=Arial size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>Kelly,</FONT></div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>I'm not Ed but I did sleep at a Holiday Inn Express!!</FONT></div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>Alloys to use for Rotary engine exhaust in order of decreasing desirability (and cost)</FONT></div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>1.) Inconel</FONT></div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>2.) 321 Stainless</FONT></div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>3.) 304 Stainless</FONT></div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>4.) 409 Stainless</FONT></div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>5.) Mild steel</FONT></div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>Basically 409 is a low chromium stainless designed for the automotive market, specifically for exhaust tubing. It does not polish well and will develop a protective coating of rust. It will live just fine, but will be less attractive.</FONT></div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>If you move up in cost you get a higher chromium and nickel content and therefore a higher temp resistance and creep resistance. This means you can make everything lighter and thinner. Of course it becomes much more important to properly design the manifold for expansion/thermal cycling loads the thinner it gets. So&nbsp; you will have to put a lot of slip joints and metal bellows in it to seal it up if it is a turbo installation. So.....how much do you want to spend to save 5 lbs or have a&nbsp;polished tail pipe&nbsp;is the question.</FONT></div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>Mild steel will work fine if it is thick enough. Especially if you coat it with ceramic. I suppose you could also coat the 409 stainless with ceramic if you want a nice finish, but it might be less expensive&nbsp;to just use 304 at that point.</FONT></div>


<div class=signature><FONT face=Arial color=#0000ff size=2></FONT>&nbsp;</div>


<div class=signature><FONT face=Arial color=#0000ff size=2>Monty </FONT></div>
</div>
</div>
<!-- end of AOLMsgPart_2_2455ed4b-b637-404f-ac2c-0c54f19d26f8 --><div class="AOLPromoFooter">
<hr style="margin-top:10px;" />
Email and AIM finally together. You've gotta check out free <a href="http://o.aolcdn.com/cdn.webmail.aol.com/mailtour/aol/en-us/index.htm?ncid=AOLAOF00020000000970" target="_blank">AOL Mail</a>!<br/>
</div>

----------MB_8C9F1090570F849_7D4_14FB_WEBMAIL-MA14.sysops.aol.com--