X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.223] (HELO priv-edtnes51.telusplanet.net) by logan.com (CommuniGate Pro SMTP 5.0.3) with ESMTP id 860117 for flyrotary@lancaironline.net; Fri, 02 Dec 2005 03:01:17 -0500 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.223; envelope-from=haywire@telus.net Received: from Endurance ([154.20.245.217]) by priv-edtnes51.telusplanet.net (InterMail vM.6.01.04.04 201-2131-118-104-20050224) with SMTP id <20051202080026.YZDV4718.priv-edtnes51.telusplanet.net@Endurance> for ; Fri, 2 Dec 2005 01:00:26 -0700 From: "Todd Bartrim" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Turbo post mortem Date: Fri, 2 Dec 2005 00:00:02 -0800 Message-ID: <018101c5f716$6706d790$0101a8c0@Endurance> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0182_01C5F6D3.58E39790" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0182_01C5F6D3.58E39790 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit MessageI left my clipboard in the plane and I know there was some old temp readings from last year written down. I had planned to record a bunch this time, but was just to busy enjoying flying again and concentrating on night circuits, so as long as the big red light wasn't flashing telling me something was out of alarm parameters, I didn't spend allot of time on anything but the EM2's front page. However I can confirm that there was a very large delta T across the turbo, and that the temp drop before the turbo is approx. 50F/inch. I have thermocouples installed at each exhaust port, then another a few inches further down right at the turbo inlet, then another ~10" after the turbo outlet (pics are in the archives if interested). I was very surprised at this temp drop myself so swapped around positions of the T/C's to confirm the temps. Strange but true. Todd I found Todd's old post, and he was measuring 700+ degrees difference. It was a fairly preliminary report, and even he was questioning whether this could be right. Maybe he'll see this, and have more info. I've heard "50 degrees per inch", as a rate of cooling with regard to placement of EGT probes. If that's correct, then it would seem like a big heavy stock manifold, and turbo would account for way more than 4 inches worth of cooling. ------=_NextPart_000_0182_01C5F6D3.58E39790 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
I left=20 my clipboard in the plane and I know there was some old temp readings = from last=20 year written down. I had planned to record a bunch this time, but was = just to=20 busy enjoying flying again and concentrating on night circuits, so as = long as=20 the big red light wasn't flashing telling me something was out of alarm=20 parameters, I didn't spend allot of time on anything but the EM2's front = page.
    However I can confirm that = there was=20 a very large delta T across the turbo, and that the temp drop before the = turbo=20 is approx. 50F/inch. I have thermocouples installed at each exhaust = port, then=20 another a few inches further down right at the turbo inlet, then another = ~10"=20 after the turbo outlet (pics are in the archives if interested). I was = very=20 surprised at this temp drop myself so swapped around positions of = the T/C's=20 to confirm the temps.
    Strange but=20 true.
 
Todd
 
I=20 found Todd's old post, and he was measuring 700+ degrees=20 difference.  It was a fairly preliminary report, and even he = was=20 questioning whether this could be right.  Maybe he'll see this, = and have=20 more info.  
 
I've=20 heard "50 degrees per inch", as a rate of cooling with regard to=20 placement of EGT probes.  If that's correct, then it would seem = like a=20 big heavy stock manifold, and turbo would account for way more = than 4=20 inches worth of=20 = cooling.  
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