Return-Path: Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 602124 for flyrotary@lancaironline.net; Mon, 10 Jan 2005 13:30:59 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.67; envelope-from=sladerj@bellsouth.net Received: from JSLADE ([65.8.216.41]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050110183037.HUOP2073.imf19aec.mail.bellsouth.net@JSLADE> for ; Mon, 10 Jan 2005 13:30:37 -0500 From: "John Slade" To: "Rotary motors in aircraft" Subject: Oil cooler baffles Date: Mon, 10 Jan 2005 13:30:38 -0500 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00C6_01C4F718.925C1300" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_00C6_01C4F718.925C1300 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit MessageRotarians, First an admission: A couple of days ago I took off with the landing brake down. I only have the NACA scoop, so the engine was getting very little air. By the time I was downwind the temps were outrageous. Coolant got to 270 and oil to 260. Needless to say I glided to a landing (on the runway) at idle. Thankfully the engine seems no worse for the experience. Oil pressure is ok to good and static rpm is unchanged. I flew again today (landing brake up) and temps were tolerable, but higher than I used to have long ago, in hotter weather before the new turbo and the rebuild. Now the question: Looking at my two stock 3rd gen oil coolers after landing I noticed something strange - most of the thin aluminum baffles between the oil channels are all bent flat, blocking the air flow. Those that aren't bent are toward the lower edge of the cooler where airflow might well be less. They're all bent the same in an even pattern that would indicate to me that this was either done by one of those crop circle guys on his day off, of the high pressure air from the scoop hitting the coolers at an angle. Has anyone else seen this? I know I can "comb" the aluminum straight again, but will it just happen again? Should put a baffle in the air stream to angle the air somehow? John (baffled) ------=_NextPart_000_00C6_01C4F718.925C1300 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Rotarians,
First=20 an admission:
A=20 couple of days ago I took off with the landing brake down. I only have = the NACA=20 scoop, so the engine was getting very little air. By the time I was = downwind the=20 temps were outrageous. Coolant got to 270 and oil to 260. Needless to = say I=20 glided to a landing (on the runway) at idle. Thankfully the engine seems = no=20 worse for the experience. Oil pressure is ok to good and static rpm is=20 unchanged. I flew again today (landing brake up) and temps were = tolerable, but=20 higher than I used to have long ago, in hotter weather before the new = turbo and=20 the rebuild. 
 
Now the question:
Looking at my two stock 3rd = gen oil=20 coolers after landing I noticed something strange - most of = the thin=20 aluminum baffles between the oil channels are = all bent=20 flat, blocking the air flow. Those that aren't bent are toward the = lower=20 edge of the cooler where airflow might well be less. They're all bent = the=20 same in an even pattern that would indicate to me that this was = either done=20 by one of those crop circle guys on his day off, of the high pressure = air from=20 the scoop hitting the coolers at an angle.
 
Has=20 anyone else seen this? I know I can "comb" the aluminum straight again, = but will=20 it just happen again?
Should=20 put a baffle in the air stream to angle the air = somehow?
 
John (baffled)
 
 
 
 
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