Return-Path: Received: from [129.116.87.170] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 602180 for flyrotary@lancaironline.net; Mon, 10 Jan 2005 14:09:23 -0500 Received-SPF: none receiver=logan.com; client-ip=129.116.87.170; envelope-from=mark.steitle@austin.utexas.edu X-MIMEOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C4F747.DC79BE40" Subject: RE: [FlyRotary] Oil cooler baffles Date: Mon, 10 Jan 2005 13:09:08 -0600 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E6CBECF@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Oil cooler baffles Thread-Index: AcT3Qofh5ePOPPzRTFCB0e+gX6up4gABPS/g From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C4F747.DC79BE40 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable John,=20 You didn't happen to "power-wash" your a/c lately? That will flatten the fins on a heat-exchanger in a hurry. Don't ask how I learned this. =20 Mark S. =20 =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John Slade Sent: Monday, January 10, 2005 12:31 PM To: Rotary motors in aircraft Subject: [FlyRotary] Oil cooler baffles =20 Rotarians, 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. =20 =20 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.=20 =20 Has anyone else seen this? I know I can "comb" the aluminum straight again, but will it just happen again?=20 Should put a baffle in the air stream to angle the air somehow? =20 John (baffled) =20 =20 =20 =20 ------_=_NextPart_001_01C4F747.DC79BE40 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

John,

You didn’t happen to = “power-wash” your a/c lately?  That will flatten the fins on a heat-exchanger in = a hurry.  Don’t ask how I learned this. 

 

Mark S.  =  

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John Slade
Sent: Monday, January 10, = 2005 12:31 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Oil = cooler baffles

 

Rotarians,<= /p>

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)

 

 

 

 

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