Return-Path: Received: from [129.116.87.171] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 576631 for flyrotary@lancaironline.net; Wed, 22 Dec 2004 09:24:43 -0500 Received-SPF: none receiver=logan.com; client-ip=129.116.87.171; envelope-from=mark.steitle@austin.utexas.edu Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C4E831.EA4CC5CF" Subject: RE: [FlyRotary] Re: Oil coolers X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Date: Wed, 22 Dec 2004 08:24:15 -0600 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E6CBE76@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Oil coolers Thread-Index: AcToMKi6HrePQdvoSp6t1V6dxlF7AQAALFIw From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C4E831.EA4CC5CF Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Bobby, Comparing the pictures to my Fluidyne cooler, the perma-cool design looks like the same size would be lighter, but less durable. The fin spacing looks to be less dense on the perma-cool. But then its hard to tell much from a picture. Mounting would be an important issue, but possibly easier for a lighter unit. =20 Mark S. ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes Sent: Wednesday, December 22, 2004 8:17 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Oil coolers =20 I found this company while researching oil coolers. Does anyone have any experience or information about these products. They advertise they pressure test the coolers to 300 psi. Fluidyne advertises testing at 200 psi. They look rugged. http://www.perma-cool.com/Catalog/Cat_page10.html =20 Bobby Hughes =20 =20 =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Tuesday, December 21, 2004 11:33 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Oil coolers =20 =20 =20 http://www.fluidyne.com/pl_theoc.html =20 =20 Really liked the DB 30517 (3.75" thick double pass model) Will probably use this one on my -8. =20 =20 Tracy =20 =20 Perhaps you mean use "two" instead of "this one". I looked closely (longingly) at the fluidyne when I was in the market for a cooler; but they just don't make on with the capacity for the 20B. One DB 30517 would handle neither the flow nor heat rejection needed; however 2 in parallel would do it. At least that's what my analysis says. =20 Al =20 Nope, at least I don't think so. Here's my take on it. =20 =20 The Mazda cooler has 180 CU In. core area and gives me enough cooling for the 13B. I'm assuming for now that the dimensions for the Fluidyne are core area (must check) which give it 275 cu in, which is 153% of the Mazda. Pretty good match, at least on paper. The "effectiveness quotient" for the Fluidyne at almost double the thickness is not as good but I'm hoping the much better ducting and pressure recovery on the -8 will cancel that out. The higher delta T air temp will give less cooling drag, at least in my universe : ) =20 In any case, the main -8 mission calls for 100 HP at >=3D18,000 ft. It'll work. =20 Tracy (please don't ask me to define "effectiveness quotient") ------_=_NextPart_001_01C4E831.EA4CC5CF Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Bobby,

Comparing the pictures to my = Fluidyne cooler, the perma-cool design looks like the same size would be lighter, = but less durable.  The fin spacing looks to be less dense on the perma-cool.  But then its hard to tell much from a picture.  = Mounting would be an important issue, but possibly easier for a lighter = unit.

 

Mark = S.

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes
Sent: Wednesday, December = 22, 2004 8:17 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Oil coolers

 

I found this = company while researching oil coolers. Does anyone have any experience or = information about these products. They advertise they pressure test the coolers to = 300 psi. Fluidyne advertises testing at 200 psi. They look = rugged.

http://www.per= ma-cool.com/Catalog/Cat_page10.html

 

Bobby = Hughes

 

 

 

From: = Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook
Sent: Tuesday, December = 21, 2004 11:33 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Oil coolers

 

 

 

http://www.fluidyne.com/pl_t= heoc.html 

 

 Really liked the DB 30517 (3.75" thick double pass model)  Will = probably use this one on my -8.   

 

 Tracy=    

 

Perhaps you mean use = “two” instead of “this one”.  I looked closely (longingly) at = the fluidyne when I was in the market for a cooler; but they just = don’t make on with the capacity for the 20B.  One DB 30517 would handle = neither the flow nor heat rejection needed; however 2 in parallel would do it.  = At least that’s what my analysis says.

 

Al

 

 Nope, at least I don't think so.   Here's my take on it.   =

 

=

The Mazda cooler has 180 CU In. core area and gives me enough cooling for = the 13B.  I'm assuming for now that the dimensions for the Fluidyne are = core area (must check) which give it 275 cu in, which is 153% of the = Mazda.  Pretty good match, at least on paper.   The = "effectiveness quotient"  for the Fluidyne at almost double the thickness is = not as good but I'm hoping the much better ducting and pressure recovery on the = -8 will cancel that out.  The higher delta T air temp will give less = cooling drag, at least in my universe : )

 

=

In any case,  the main -8 mission calls for 100 HP at  = >=3D18,000 ft.  It'll work.

 

=

 Tracy=    (please don't ask me to define "effectiveness = quotient")

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