X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Received: from sccrmhc12.comcast.net ([204.127.200.82] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2020510 for flyrotary@lancaironline.net; Tue, 01 May 2007 22:08:28 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.200.82; envelope-from=wschertz@comcast.net Received: from 7n7z201 (c-24-7-194-231.hsd1.il.comcast.net[24.7.194.231]) by comcast.net (sccrmhc12) with SMTP id <200705020207370120036sdne>; Wed, 2 May 2007 02:07:38 +0000 Message-ID: <001c01c78c5e$b7cb31b0$6401a8c0@7n7z201> From: "Bill Schertz" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: oil coolers Date: Tue, 1 May 2007 21:08:02 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0019_01C78C34.CE40CDD0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0019_01C78C34.CE40CDD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageFor efficient heat transfer from the oil to the exchanger metal, = you want to have turbulent flow, which is achieved in the Mazda cooler = by flow passage design and (I think) turbulators in the tubes. You would = not have that with a water core in the oil pan, because the oil would be = moving slowly through the pan to the pick up tube. Doesn't say it can't be made to work, but you would need larger surface = area. Oil has poor heat conductivity, so the oil near the cool surface = prevents the heat from going from further out to the cool surface (acts = like an insulator). By having the oil flowing rapidly, the cool oil near = the surface is mixed with hotter oil in the main stream. Bill Schertz KIS Cruiser # 4045 ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Monday, April 30, 2007 7:40 AM Subject: [FlyRotary] Re: oil coolers The new core mat. that I use for my coolers is just like oem = mazda high pressure and same overall size. I can make them wider if need be. = My question is there that much of an advantage in the oil/water over = the oil/air cooler being that there is more lines to hook up with the = oil/water system. Hi Ed, I've always liked the oil/water heat exchanger concept, but as you = say, there's more to hook up. Along those lines, an idea that I've = never seen fully tested is a water core inside the oil pan. The = advantages would be that you don't need extra space for an oil cooler, = and you have only one pressurized oil hose. The oil pickup tube is a = bit of an obstacle, but with your welding talents, I'm sure you could = work around this. =20 I'm currently testing the same concept on the single rotor stand, but = I'm using a Fluidyne exchanger rather than the oil pan. I really think = it's going to work well, but it would be nice to eliminate the extra = hoses by making this all in the oil pan. =20 Cheers, Rusty (where the heck do all these Rotax parts go...) ------=_NextPart_000_0019_01C78C34.CE40CDD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
For efficient heat transfer from the = oil to the=20 exchanger metal, you want to have turbulent flow, which is achieved in = the Mazda=20 cooler by flow passage design and (I think) turbulators in the tubes. = You would=20 not have that with a water core in the oil pan, because the oil would be = moving=20 slowly through the pan to the pick up tube.
 
Doesn't say it can't be made to work, = but you would=20 need larger surface area.  Oil has poor heat conductivity, so the = oil near=20 the cool surface prevents the heat from going from further out to the = cool=20 surface (acts like an insulator). By having the oil flowing rapidly, the = cool=20 oil near the surface is mixed with hotter oil in the main = stream.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Monday, April 30, 2007 = 7:40=20 AM
Subject: [FlyRotary] Re: oil=20 coolers

      The new core mat. = that I use=20 for my coolers is just like oem mazda
high pressure and same = overall size.=20 I can make them wider if need be. My
question is there that much of = an=20 advantage in the  oil/water  over the
oil/air cooler = being that=20 there is more lines to hook up with the = oil/water
system.

Hi Ed,

I've always liked the = oil/water heat=20 exchanger concept, but as you say, there's more to hook = up.   Along=20 those lines, an idea that I've never seen fully tested is a water core = inside=20 the oil pan.   The advantages would be that you don't need = extra=20 space for an oil cooler, and you have only one pressurized oil=20 hose.   The oil pickup tube is a bit of an obstacle, = but with=20 your welding talents, I'm sure you could work around this.  =
 
I'm currently testing the = same=20 concept on the single rotor stand, but I'm using a Fluidyne exchanger = rather=20 than the oil pan.  I really think it's going to work well, = but it=20 would be nice to eliminate the extra hoses by making this all in the = oil=20 pan.  
 
Cheers,
Rusty (where the heck do = all these=20 Rotax parts go...)
  
------=_NextPart_000_0019_01C78C34.CE40CDD0--