X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-04.texas.rr.com ([24.93.47.43] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2071360 for flyrotary@lancaironline.net; Mon, 28 May 2007 11:58:41 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.93.47.43; envelope-from=clouduster@austin.rr.com Received: from [10.0.0.99] (cpe-70-122-12-239.austin.res.rr.com [70.122.12.239]) by ms-smtp-04.texas.rr.com (8.13.6/8.13.6) with ESMTP id l4SFw4TS014003 for ; Mon, 28 May 2007 10:58:04 -0500 (CDT) Message-ID: <465AFC0B.7010907@austin.rr.com> Date: Mon, 28 May 2007 10:58:03 -0500 From: Dennis Haverlah User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Cooling Recommendations Content-Type: multipart/alternative; boundary="------------090602070205000503070806" X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. --------------090602070205000503070806 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Rotary Group, Thanks for the suggestions - questions etc. Questions and--- maybe answers Oil pan clearance. The oil pan is a flat bottom Renesis stock pan . In the first picture sent 5/27 it is about level with the white motor mount tube under the engine. At the front it is about 2 inches from the radiator surface. At the back it is about 8 inches above the radiator. The pan only covers some of the water rad. and none of the oil rad. I get better cooling on the water side so I don't believe it is a problem. Duct shape. My James cowl inlet ended about 3/4 inch inside the opening. I added foam and glass to make a smooth transition to the bottom and sides of the cowl. Air entering near the top of the inlet either turns up about 90 deg.within 2 inches of the inlet to the air filter or goes straight back to the radiator. I don't like this arrangement but don't know how much the turbulance contributes to poor cooling. My first attempt to improve the top inlet flow made cooling worse so I am looking at other areas now. Water hose may be restrictive. The hoses in the first 5/27 picture are oil lines to the oil cooler. An-10 to the cooler and AN-8 back to the engine. The water coolant hoses are AN-20 not shown because they are behind and on the other side of the engine. Turnning Vane construction. I can easily construct a support that bolts to the bottom of the cowl. This may be able to be installed through the inlet without taking the bottom cowl off. I have not found much information on flow turning vanes in either the K&W Chapter 12 or Hoerner's Fluid -Dynamic Drag. Probably need to look at HVAC duct design information. Dennis H. --------------090602070205000503070806 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Rotary Group,
Thanks for the suggestions - questions etc.

Questions and--- maybe answers

Oil pan clearance.
The oil pan is a flat bottom Renesis stock pan . In the first picture sent 5/27 it is about level with the white motor mount tube under the engine. At the front it is about 2 inches from the radiator surface. At the back it is about 8 inches above the radiator. The pan only covers some of the water rad. and none of the oil rad. I get better cooling on the water side so I don't believe it is a problem.

Duct shape.
My James cowl inlet ended about 3/4 inch inside the opening. I added foam and glass to make a smooth transition to the bottom and sides of the cowl. Air entering near the top of the inlet either turns up about 90 deg.within 2 inches of the inlet to the air filter or goes straight back to the radiator. I don't like this arrangement but don't know how much the turbulance contributes to poor cooling. My first attempt to improve the top inlet flow made cooling worse so I am looking at other areas now.

Water hose may be restrictive.
The hoses in the first 5/27 picture are oil lines to the oil cooler. An-10 to the cooler and AN-8 back to the engine.
The water coolant hoses are AN-20 not shown because they are behind and on the other side of the engine.

Turnning Vane construction.
I can easily construct a support that bolts to the bottom of the cowl. This may be able to be installed through the inlet without taking the bottom cowl off.
I have not found much information on flow turning vanes in either the K&W Chapter 12 or Hoerner's Fluid -Dynamic Drag. Probably need to look at HVAC duct design information.

Dennis H.
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