Return-Path: Received: from fed1rmmtao02.cox.net ([68.230.241.37] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 595393 for flyrotary@lancaironline.net; Sat, 08 Jan 2005 00:31:24 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.37; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao02.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20050108053053.LOES17983.fed1rmmtao02.cox.net@BigAl> for ; Sat, 8 Jan 2005 00:30:53 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: oi/water Exchanger [FlyRotary] Re: fluidyne oil cooler Date: Fri, 7 Jan 2005 21:30:58 -0800 Message-ID: <000001c4f543$3bb52e00$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4F500.2D91EE00" 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 V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4F500.2D91EE00 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Re: oi/water Exchanger [FlyRotary] Re: fluidyne oil cooler =20 I was considering the idea when I was planning my installation and one = big question kept popping into my mind: which side of the rad do you put the interchanger? =20 -From the standpoint of the coolant temp at the radiator, it makes essentially no difference. The total heat rejection requirement remains = the same, and it will take the same coolant/air delta T either way. What = I've seen, they are generally plumbed in on the return side of the rad to get better heat rejection from the oil, and the piston guys like to have the engine run a bit hotter for better efficiency. This may not be true for = a rotary. =20 I'd guess the best place to plumb it depends on the balance of your = system. The oil/water delta T is generally going to be 20-30F, and the oil can = run that much hotter than the coolant, so no matter. To put a fine point on = it, you could see which way you get more power from the rotary - a little = higher oil temp (interchanger on the coolant out side), or a little higher = coolant temp (interchanger on the coolant return side). Which ever way gives = you more power out (if any) will result in a couple of degrees lower rad = temp. =20 Al ------=_NextPart_000_0001_01C4F500.2D91EE00 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: oi/water Exchanger [FlyRotary] Re: fluidyne oil = cooler

 

I was considering the idea when I was planning my installation and one big question kept popping into my mind: which side of the rad do you put the interchanger?

 

-From the standpoint = of the coolant temp at the radiator, it makes essentially no difference.  = The total heat rejection requirement remains the same, and it will take the = same coolant/air delta T either way.  What I’ve seen, they are = generally plumbed in on the return side of the rad to get better heat rejection = from the oil, and the piston guys like to have the engine run a bit hotter for = better efficiency. This may not be true for a rotary.

 

I’d guess the best place to plumb it depends = on the balance of your system.  The oil/water delta T is generally going = to be 20-30F, and the oil can run that much hotter than the coolant, so no = matter.  To put a fine point on it, you could see which way you get more power from = the rotary – a little higher oil temp (interchanger on the coolant out = side), or a little higher coolant temp (interchanger on the coolant return = side).  Which ever way gives you more power out (if any) will result in a couple of = degrees lower rad temp.

 <= /font>

Al

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