X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.80] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 888911 for flyrotary@lancaironline.net; Mon, 19 Dec 2005 17:29:18 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.80; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 19 Dec 2005 14:24:44 -0800 Message-ID: Received: from 4.171.150.151 by BAY115-DAV8.phx.gbl with DAV; Mon, 19 Dec 2005 22:24:44 +0000 X-Originating-IP: [4.171.150.151] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Heat exchangers Date: Mon, 19 Dec 2005 17:24:38 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0083_01C604C1.16EBF700" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Mon, 19 Dec 2005 17:24:38 -0500 X-OriginalArrivalTime: 19 Dec 2005 22:24:44.0851 (UTC) FILETIME=[0375B830:01C604EB] This is a multi-part message in MIME format. ------=_NextPart_000_0083_01C604C1.16EBF700 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageGood point Rusty.=20 I used Bellville washers under the nuts on the 4 threaded rods which = will allow the tanks to thermally expand. Left about .040" of travel in = the washer stack for this purpose. The spring pressure on the tanks is = about the same value as the oil pressure trying to split them apart, = according to my rough calculations. I'll still use the accumulator to = damp out pressure pulses if I try this thing though. Random thought: Very strange that Lynn and other car racers have not = had a problem with the cores but you busted 2 of them. BTW, your = aluminum welding looked fine to me! My AL welding looks like hell so = far. Tracy =20 ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Monday, December 19, 2005 2:06 PM Subject: [FlyRotary] Re: Heat exchangers Here is a picture of the Ford fitting attach area. Note the strap to = hold the stack together. Also not the 1/8 thick plate that the fitting = is attached to. Looks like this may have been a fix for a design problem = with the other cores. =20 Hi Monty, I wonder about the wisdom of trying to restrain the cores from being = able to expand. I installed a radiator that came with dire warnings = against rigidly mounting it. They said it had to be allowed to expand = and contract with temp changes, and if you mounted it rigidly, it would = fail in short order. =20 I realize the strap in the photo is stock, and perhaps if you keep the = same type material (aluminum, steel, etc), and subject it to the same = temps, then it will expand and contract along with the core. I just = don't think it would be wise to try to beef up a core, without knowing = what new stresses it might cause. =20 Cheers, Rusty ------=_NextPart_000_0083_01C604C1.16EBF700 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Good point Rusty. 
 
 I used Bellville washers under the nuts on the 4 threaded = rods which=20 will allow the tanks to thermally expand.  Left about .040" of = travel in=20 the washer stack for this purpose.  The spring pressure on the = tanks is=20 about the same value as the oil pressure trying to split them=20 apart, according to my rough calculations.   I'll = still use=20 the accumulator to damp out pressure pulses if I try this thing = though.
 
Random thought:  Very strange that Lynn and other car racers = have not=20 had a problem with the cores but you busted 2 of them.   BTW, = your=20 aluminum welding looked fine to me!  My AL welding looks like hell = so=20 far.
 
Tracy 
----- Original Message -----
From: Russell=20 Duffy
To: Rotary motors in = aircraft
Sent: Monday, December 19, 2005 = 2:06=20 PM
Subject: [FlyRotary] Re: Heat=20 exchangers

Here is a picture of the Ford = fitting=20 attach area. Note the strap to hold the stack together. Also not the = 1/8 thick=20 plate that the fitting is attached to. Looks like this may have been a = fix for=20 a design problem with the other cores.  
 
Hi Monty,
 
I wonder about the wisdom of trying to = restrain the=20 cores from being able to expand. I installed a radiator that came = with dire warnings against rigidly mounting it.  They = said it=20 had to be allowed to expand and contract with temp changes, and = if you=20 mounted it rigidly, it would fail in short=20 order.  
 
I realize the strap in the photo is stock, = and=20 perhaps if you keep the same type material (aluminum, steel, etc), and = subject=20 it to the same temps, then it will expand and contract along with the=20 core.  I just don't think it would be wise to try to beef up a = core,=20 without knowing what new stresses it might cause. =20
 
Cheers,
Rusty=20
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