Return-Path: Received: from fed1mtao05.cox.net ([68.6.19.126] verified) by logan.com (CommuniGate Pro SMTP 4.1.1) with ESMTP id 2545624 for flyrotary@lancaironline.net; Mon, 25 Aug 2003 01:24:53 -0400 Received: from BigAl ([68.107.116.221]) by fed1mtao05.cox.net (InterMail vM.5.01.06.04 201-253-122-130-104-20030726) with ESMTP id <20030825052442.CPUL1408.fed1mtao05.cox.net@BigAl> for ; Mon, 25 Aug 2003 01:24:42 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: cooling and radiators Date: Sun, 24 Aug 2003 22:24:59 -0700 Message-ID: <000001c36ac9$3a488db0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_NextPart_000_0001_01C36A8E.8DE9B5B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 Importance: Normal In-Reply-To: X-MS-TNEF-Correlator: 00000000F306FC3F53D3104CBB1D665D073778B724772800 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C36A8E.8DE9B5B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John Slade Sent: Sunday, August 24, 2003 2:26 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: cooling and radiators Re; Al Wicks radiator It's good that he got it to work well. He has enough radiator for the = hp, and both some vg's before the duct entrance, and exhaust augmention will help the air flow. That's all good, but I'm put off by statements such = as:=20 "The first thing to keep in mind is that heat transfer with coolant is substantially more efficient than an air cooled engine. Why is that? The specific heat of water is 1.0, meaning it is extremely effective at grabbing and releasing heat. Air and oil are insulators in comparison. = Oil has a specific heat of 4/10. So oil is 40% as effective. Air is even = worse at .24. The conclusion? It should be easy to use the same ducting as the Lycoming engines." which is incorrect. Of course water is more effective than air in = carrying heat, and it carries it from the engine to the radiator. Now what? Now = we have to reject to air, just like a Lyc, except we have to do it at a = lower temperature; so it is less efficient, and will need more airflow. Fortunately a radiator has better volumetric heat transfer efficiency to help make up for it. Then he says: As a result, I don't need an oil cooler (less drag, complexity). My oil temperature follows coolant temperature then peaks at 237F. Well within normal operating temp. 237 is well within the operating temp? Well, yes; it is below the upper limit on a piston engine, but not something you want to do on a regular basis with a rotary. 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