X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 889210 for flyrotary@lancaironline.net; Mon, 19 Dec 2005 20:49:30 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.67; envelope-from=13brv3@bellsouth.net Received: from ibm59aec.bellsouth.net ([65.6.194.9]) by imf19aec.mail.bellsouth.net with ESMTP id <20051220014835.USIZ21001.imf19aec.mail.bellsouth.net@ibm59aec.bellsouth.net> for ; Mon, 19 Dec 2005 20:48:35 -0500 Received: from rd ([65.6.194.9]) by ibm59aec.bellsouth.net with ESMTP id <20051220014833.DCTA11189.ibm59aec.bellsouth.net@rd> for ; Mon, 19 Dec 2005 20:48:33 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Heat exchangers Date: Mon, 19 Dec 2005 19:48:22 -0600 Message-ID: <000001c60507$7c3a3fe0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C604D5.319FCFE0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C604D5.319FCFE0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Random thought: Very strange that Lynn and other car racers have not = had a problem with the cores but you busted 2 of them. =20 =20 Hi Tracy, =20 I've pondered this question as well, and the only thing I can think of = is the fact that racers don't sit at one rpm for any real length of time. = I wonder if the cores I was using just happened to have a resonant = frequency that matches what you get from the oil pump at 6000-6500 rpm. =20 =20 When the first one failed, it was during high power ground runs, testing intakes. I was running WOT, and playing with timing, mixtures, etc for = as long as I could without overheating. The second one was during steady cruise, at about 6500 rpm IIRC. =20 =20 Note that both coolers failed at the same seam, which is the one that's = made by the end plate. If you look at these cores, you can see that those = seams are not the nicest looking joints you've ever seen. =20 =20 BTW, your aluminum welding looked fine to me! My AL welding looks like hell so far.=20 =20 Thanks, but when you figure there were 10 fittings welded, you can bet = that the nicest one was closest to the camera :-) I look at the Fluidyne coolers in I'm just in awe of the welding skill that I see. I really = wish I had someone locally to show me how to go from "works", to "proper". = Pity Ed K is about as far away as you can get, or I'd pay to watch him weld aluminum, and hope some of it rubbed off on me :-) =20 Cheers, Rusty (still hoping to run the single rotor by the end of the year) =20 =20 =20 =20 =20 ------=_NextPart_000_0001_01C604D5.319FCFE0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
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.   
 
Hi=20 Tracy,
 
I've=20 pondered this question as well, and the only thing I can think of is the = fact=20 that racers don't sit at one rpm for any real length of time.  I = wonder if=20 the cores I was using just happened to have a resonant frequency = that=20 matches what you get from the oil pump at 6000-6500 rpm. =20
 
When=20 the first one failed, it was during high power ground runs, testing=20 intakes.  I was running WOT, and playing with timing, mixtures, etc = for as=20 long as I could without overheating.   The second one was during steady cruise, at = about 6500 rpm=20 IIRC.  
 
Note=20 that both coolers failed at the same seam, which is the one = that's=20 made by the end plate.  If you look at these cores, you can see = that those=20 seams are not the nicest looking joints you've ever seen. =20    
 
 BTW, your aluminum = welding=20 looked fine to me!  My AL welding looks like hell so far. 
 
Thanks, but when you figure there were 10 fittings welded, = you can=20 bet that the nicest one was closest to the camera :-)   I look = at=20 the Fluidyne coolers in I'm just in awe of the welding skill = that I=20 see.  I really wish I had someone locally to show me how to go from = "works", to "proper".  Pity Ed K is about as far away as you = can get,=20 or I'd pay to watch him weld aluminum, and hope some of it rubbed = off on me=20  :-)
 
Cheers,
Rusty=20 (still hoping to run the single rotor by the end of the=20 year)
 
    
 
 
 
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