X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-05.southeast.rr.com ([24.25.9.104] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2074752 for flyrotary@lancaironline.net; Wed, 30 May 2007 11:11:57 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.104; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-05.southeast.rr.com (8.13.6/8.13.6) with SMTP id l4UFAS60006678 for ; Wed, 30 May 2007 11:10:29 -0400 (EDT) Message-ID: <000501c7a2cc$ad280e20$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: James Cowl - RV-7a - Renesis - Cooling Date: Wed, 30 May 2007 11:10:35 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit 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 X-Virus-Scanned: Symantec AntiVirus Scan Engine I agree with Finn. I read someplace (that appeared credible) that you could loose 20% of your cooling with leaks totaling less than 1 sq inch - easy to get with a small hole here and there. Don't know how accurate that figure is , but the thought is there - plug all leaks. Ed ----- Original Message ----- From: "Finn Lassen" To: "Rotary motors in aircraft" Sent: Wednesday, May 30, 2007 11:06 AM Subject: [FlyRotary] Re: James Cowl - RV-7a - Renesis - Cooling > Hi Dennis, > > Hans already mentioned this in passing, but I want to emphasize it: > How well are the radiators sealed against the cowling and in between each > other? > > Seeming small cracks or openings can make a big difference. > > Finn > > Dennis Haverlah wrote: >> I had very marginal cooling on my first and second flight - RV 7A, James >> cowl, Griffin Scirocco aluminum double pass water radiator with a Mazda >> 1989? RX-7 oil cooler. Water radiator fin size - 22LX13WX2.5T inches. >> Oil - 19LX4.5WX 2T inches. The radiators are mounted side-by-side under >> the engine and are at about 25 - 30 degree to the inlet air flow. (The >> air must turn 60-65 deg to flow through the radiators) See photos 1 and >> 2. After my first 2 flights, I constructed a divider/duct to provide a >> duct for the engine combustion air to make the sharp turn 90 deg. up >> after the inlet to get to the filter. The bottom of this duct was also >> supposed to provide a duct wall for the air going to the radiators. See >> photo 3. Two flights demonstrated this really hurt - not helped - my >> cooling. Now I can barely take off and fly the pattern before getting up >> to 210 - 215 on oil and water. The divider duct took out about 8-10 sq. >> in. of inlet area but removed the engine combustion air requirement form >> the remaining inlet air going in the larger inlet. > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html