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 576659 for flyrotary@lancaironline.net; Wed, 22 Dec 2004 09:43:27 -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_01C4E834.872D3047" Subject: RE: [FlyRotary] Re: Oil coolers X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Date: Wed, 22 Dec 2004 08:42:57 -0600 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E6CBE77@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Oil coolers Thread-Index: AcToMrcroiNwZ4QdTfWJDDmyqLSoNAAAPTLA From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C4E834.872D3047 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Yes, it looks like I'll be replacing the old 5/8" bushings with =BE" = bushings supplied by M/T. To use these, it requires opening up the six = holes in the re-drive hub to .756" in order to accept the M/T bushings. = I need to check with Tracy on the best way to ream the holes as the hub = is hardened 4130. =20 Mark S. =20 =20 =20 =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On = Behalf Of Bobby J. Hughes Sent: Wednesday, December 22, 2004 8:32 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Oil coolers =20 Mark, =20 Did you ever figure out a good solution for you MT Prop / RWS redrive = problem? This is the combination that I am looking at.=20 =20 Bobby =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On = Behalf Of Mark R Steitle Sent: Wednesday, December 22, 2004 8:24 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Oil coolers 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_01C4E834.872D3047 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message

Yes, it looks like I’ll be = replacing the old 5/8” bushings with =BE” bushings supplied by M/T.=A0 = To use these, it requires opening up the six holes in the re-drive hub to = .756” in order to accept the M/T bushings.=A0 I need to check with Tracy on the best way to ream the = holes as the hub is hardened 4130.

 

Mark S.=A0 =

 

=A0=A0=A0 =

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes
Sent: Wednesday, December = 22, 2004 8:32 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Oil coolers

 

Mark,

 

Did you ever figure out a good = solution for you MT Prop / RWS redrive problem? This is the combination that I am looking at.

 

Bobby

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark R Steitle
Sent: Wednesday, December = 22, 2004 8:24 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Oil coolers

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<= /st1:place>   

 

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<= /st1:place>   (please don't ask me to define "effectiveness = quotient")

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