X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from bay0-omc1-s24.bay0.hotmail.com ([65.54.246.96] verified) by logan.com (CommuniGate Pro SMTP 5.1c.3) with ESMTP id 1349244 for flyrotary@lancaironline.net; Sat, 26 Aug 2006 00:07:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.96; envelope-from=thomphy@msn.com Received: from hotmail.com ([207.46.8.140]) by bay0-omc1-s24.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 25 Aug 2006 21:06:51 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 25 Aug 2006 21:06:50 -0700 Message-ID: Received: from 71.34.92.196 by BAY118-DAV2.phx.gbl with DAV; Sat, 26 Aug 2006 04:06:45 +0000 X-Originating-IP: [71.34.92.196] X-Originating-Email: [thomphy@msn.com] X-Sender: thomphy@msn.com From: "Thomas Phy" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Exhaust heat (radiant energy) Date: Fri, 25 Aug 2006 21:21:52 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_012C_01C6C88C.7BFB9620" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-OriginalArrivalTime: 26 Aug 2006 04:06:50.0825 (UTC) FILETIME=[0EC08B90:01C6C8C5] Return-Path: thomphy@msn.com This is a multi-part message in MIME format. ------=_NextPart_000_012C_01C6C88C.7BFB9620 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Lynn, I saw the same thing on Piper Navaho Chieftain's with turbo lycomings on = it when we ran them up at night without cowlings on. Pretty impressive to observe! TP ----- Original Message -----=20 From: Lehanover@aol.com=20 To: Rotary motors in aircraft=20 Sent: Friday, August 25, 2006 8:04 PM Subject: [FlyRotary] Exhaust heat (radiant energy) So here is an engine on the dyno at full song. Notice anything = interesting about the exhaust system? The engine is tuned for best = power, and that means just a hair rich of peak EGT.=20 It has a short life expectancy. Both the engine and the exhaust = system. These exhaust systems are .049" and .035" Inconel sheet stock rolled = and welded by hand. I have two of them. They are works of art. Notice that the turbo must be supported. Even the Inconel has much = reduced strength in this situation.=20 At 900 HP and 28% efficiency how many BTUs are we looking at leaving = as waste heat?=20 So if you were to ceramic coat inside and out, and then heat wrap the = tubes the heat left in the exhaust gasses would be astounding. These = headers are exposed to the airstream in the race car. Not so in the = airplane. Even the tip of the exhaust pipe should be turned slightly = away from the airframe. The EGT measured at the port will diminish only = slightly at the tip of the pipe, if you insulate the pipe. You cannot = hold your hand even a foot from these pipes for even a few seconds. Lynn E. Hanover -------------------------------------------------------------------------= ----- -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_012C_01C6C88C.7BFB9620 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Lynn,
I saw the same thing on Piper Navaho Chieftain's with turbo = lycomings on it=20 when we ran them up at night without cowlings on.
Pretty impressive to observe!
TP
----- Original Message -----
From:=20 Lehanover@aol.com
Sent: Friday, August 25, 2006 = 8:04=20 PM
Subject: [FlyRotary] Exhaust = heat=20 (radiant energy)

So here is an engine on the dyno at full song. Notice anything=20 interesting about the exhaust system? The engine is tuned for best = power, and=20 that means just a hair rich of peak EGT.
 
It has a short life expectancy. Both the engine and the exhaust=20 system.
 
These exhaust systems are .049" and .035" Inconel sheet stock = rolled and=20 welded by hand. I have two of them. They are works of art.
 
Notice that the turbo must be supported. Even the Inconel has = much=20 reduced strength in this situation.
 
At 900 HP and 28% efficiency how many BTUs are we looking at = leaving as=20 waste heat?
 
So if you were to ceramic coat inside and out, and then heat wrap = the=20 tubes the heat left in the exhaust gasses would be astounding. These = headers=20 are exposed to the airstream in the race car. Not so in the airplane. = Even the=20 tip of the exhaust pipe should be turned slightly away from the = airframe. The=20 EGT measured at the port will diminish only slightly at the tip of the = pipe,=20 if you insulate the pipe. You cannot hold your hand even a foot from = these=20 pipes for even a few seconds.
 
Lynn E. Hanover

--
Homepage:  http://www.flyrotary.com/
Archive and=20 UnSub:  =20 http://mail.lancaironline.net/lists/flyrotary/
------=_NextPart_000_012C_01C6C88C.7BFB9620--