Return-Path: Received: from [65.54.169.107] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3001778 for flyrotary@lancaironline.net; Sat, 21 Feb 2004 16:49:54 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sat, 21 Feb 2004 13:38:35 -0800 Received: from 67.24.244.98 by bay3-dav77.bay3.hotmail.com with DAV; Sat, 21 Feb 2004 21:38:35 +0000 X-Originating-IP: [67.24.244.98] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] exhaust Date: Sat, 21 Feb 2004 16:38:36 -0500 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0008_01C3F899.2740D1B0" Message-ID: X-OriginalArrivalTime: 21 Feb 2004 21:38:35.0718 (UTC) FILETIME=[0F664E60:01C3F8C3] ------=_NextPart_001_0008_01C3F899.2740D1B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I use the stock manifold on the test stand with heavy wall mild steel pip= e and it has held up well. I could never bear the thought of bolting tha= t 18 pound chunk of iron to an airplane though. I flew the HushPowerII muffler for the first flight test yesterday. I e= asily got back my 4 mph lost to drag of the Spintech (Sun 100 here I come= !) and the noise level is about the same, perhaps slightly louder, I forg= ot to take the sound meter along. Tracy ----- Original Message ----- From: sqpilot@earthlink Sent: Saturday, February 21, 2004 8:45 AM To: Rotary motors in aircraft Subject: [FlyRotary] exhaust My 13b engine is ready to run....I ordered a VAM muffler, but since it ha= s not yet happened, I was wondering if I could get away with using the stoc= k cast iron manifold with a straight pipe attached to it, which would exit through the bottom of the cowling. I should mention that this is on a pusher. George Graham told me that he was using a straight, (or slightly bent) pipe, and possibly Perry Mick is or was using the stock cast iron manifold? My thinking is that although it is heavy, it might possibly absorb a lot of the initial heat as it is exiting the exhaust ports, acti= ng like a heat collector, and I might not need expensive inconel or 321 stainless after the exhaust goes through the stock manifold first? Would the cast iron manifold absorb much of the heat and possibly muffle some o= f the noise as it is bounced around inside of the stock manifold? I'm probably grasping at straws, but with all the knowledge and experience in this group, I figure it wouldn't hurt to ask. Thanks to all for your opinions and advice. Paul Conner, 13b powered SQ2000 >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_001_0008_01C3F899.2740D1B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I use the stoc= k manifold on the test stand with heavy wall mild steel pipe and it has h= eld up well. I could never bear the thought of bolting that 18 poun= d chunk of iron to an airplane though.

I fle= w the HushPowerII muffler for the first flight test yesterday. = ; I easily got back my 4 mph lost to drag of the Spintech (Sun 100 h= ere I come!) and the noise level is about the same, perhaps slightly loud= er, I forgot to take the sound meter along.

= Tracy

----- Original Message ----= -

Sent: Saturday, February 21, 2004 8:45 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] exhaust

= My 13b engine is ready to run....I ordered a VAM muffler, but since it ha= s
not yet happened, I was wondering if I could get away with using the= stock
cast iron manifold with a straight pipe attached to it, which w= ould exit
through the bottom of the cowling. I should mention that thi= s is on a
pusher. George Graham told me that he was using a straight, = (or slightly
bent) pipe, and possibly Perry Mick is or was using the s= tock cast iron
manifold? My thinking is that although it is heav= y, it might possibly
absorb a lot of the initial heat as it is exiting= the exhaust ports, acting
like a heat collector, and I might not need= expensive inconel or 321
stainless after the exhaust goes through the= stock manifold first? Would
the cast iron manifold absorb much = of the heat and possibly muffle some of
the noise as it is bounced aro= und inside of the stock manifold? I'm
probably grasping at straw= s, but with all the knowledge and experience in
this group, I figure i= t wouldn't hurt to ask. Thanks to all for your
opinions and advi= ce. Paul Conner, 13b powered SQ2000

>> H= omepage: http://www.flyrotary.com/
>> Archive: = http://lancaironline.net/lists/flyrotary/List.html
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