X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from outbound-mail-342.bluehost.com ([66.147.249.3] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with SMTP id 3906035 for flyrotary@lancaironline.net; Fri, 30 Oct 2009 14:04:47 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.147.249.3; envelope-from=jslade@canardaviation.com Received: (qmail 9270 invoked by uid 0); 30 Oct 2009 18:04:10 -0000 Received: from unknown (HELO host296.hostmonster.com) (66.147.240.96) by outboundproxy7.bluehost.com.bluehost.com with SMTP; 30 Oct 2009 18:04:10 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=canardaviation.com; h=Received:Message-ID:Date:From:User-Agent:MIME-Version:To:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding:X-Identified-User; b=i8q6uPNfLZJxlL1l9WLxvy5Cy6qSe6aF6DGSCQ/zWuI/kRxxDwTS+Ri7j6/kkbl0Cdya2QsYFFSEXNEpr5YI/N3DOJHhmpwjBD1DtR+ZKvW+wgy1AnprQ90OxFsbAsRP; Received: from c-76-108-115-200.hsd1.fl.comcast.net ([76.108.115.200] helo=[192.168.1.4]) by host296.hostmonster.com with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.69) (envelope-from ) id 1N3vpa-0006Vh-9X for flyrotary@lancaironline.net; Fri, 30 Oct 2009 12:04:10 -0600 Message-ID: <4AEB2A85.8030900@canardaviation.com> Date: Fri, 30 Oct 2009 14:03:49 -0400 From: John Slade User-Agent: Thunderbird 1.5.0.14 (Windows/20071210) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Cooling report References: In-Reply-To: Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Identified-User: {3339:host296.hostmonster.com:instanu1:canardaviation.com} {sentby:smtp auth 76.108.115.200 authed with jslade+canardaviation.com} What also matters here is whether the fan is able to draw air from the hot side of the radiators or oil coolers rather than from the cool intake air. I installed a powerful Ferrari fan, and all it did was suck hot cowl air into the plenum through the oil coolers. Ground cooling was better when I took the fan out :(
John

Al Gietzen wrote:

Al,

I believe Rino said he had a fan on the oil cooler, which I feel would be restrictive in aviation use, from what I've heard. Might be good for taxiing etc.

George ( down under)

George;

I added a fan behind the coolant radiator; and found it had no detrimental effect in flight, and made a big improvement in cooling on the ground. This is on a pusher (Velocity) with a ram scoop. I expect it could make a difference depending on what type of fan and the effectiveness of the intake scoop.

Al G