X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-pb0-f52.google.com ([209.85.160.52] verified) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTPS id 5840627 for flyrotary@lancaironline.net; Wed, 24 Oct 2012 13:21:57 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.160.52; envelope-from=rwstracy@gmail.com Received: by mail-pb0-f52.google.com with SMTP id rr13so1204486pbb.25 for ; Wed, 24 Oct 2012 10:21:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:references:from:content-type:x-mailer:in-reply-to :message-id:date:to:content-transfer-encoding:mime-version; bh=9PWWSwXsd341nlQO3nQxaPiIUNzf7DyYxXiyn1yuskw=; b=E3ETxuqSeJm9sa5Em5jIwmnPPX8ujp/yMZOOE67nUriD+JH3tYAZTvZHe8VH/0eIQw nZlciOnWKwjfVkIg4l5JTpaBEE2ieT2pi9A6nXTZpOJFu+W9kOvyKs+eFJ4wRzFi4FL9 9Gojq00At/UvYWgkDBr309It2RBbWYrSYOx+XGM9rJxTWeF6WjJUTJK1nVjsV5V/owdf eH6coEmt3gwE1MYeo0iLyDkNHkDrQEcbao/BYklNgCGw2qi9McMHD0iqgI9LcQ9v4xqT TlT68RpiuylaOHNFXX+i2yVhFTbS3WAKd9XIdy9jOzvu9Pg1K1DnAncx0NA//DzGqs3c L0pw== Received: by 10.66.74.196 with SMTP id w4mr45751134pav.32.1351099282703; Wed, 24 Oct 2012 10:21:22 -0700 (PDT) Return-Path: Received: from [192.168.1.3] (118.sub-70-196-198.myvzw.com. [70.196.198.118]) by mx.google.com with ESMTPS id ig5sm5056735pbc.40.2012.10.24.10.21.18 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 24 Oct 2012 10:21:21 -0700 (PDT) Subject: Re: [FlyRotary] Re: flow path in conventional radiator References: From: Tracy Content-Type: text/plain; charset=us-ascii X-Mailer: iPad Mail (10A403) In-Reply-To: Message-Id: Date: Wed, 24 Oct 2012 11:21:17 -0600 To: Rotary motors in aircraft Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (1.0) On Oct 24, 2012, at 10:14 AM, Kenneth Johnson wrote:= > A more efficient design would have intake air entering the bottom anterio= r of the the cowl and to pass through the radiator. As this air is heated b= y the radiator it rises and should exit the top sides of the cowl. No one h= as done that because of the risk of engine oil on the windshield. I haven't read Paul's book but if this is an example of his suggestions, I w= ouldn't have much confidence in it. =20 Two basic rules of thumb for A/C cooling systems are: 1. Turning high speed air is hard to do and loss prone energy wise. 2. The pressure represented by convection of rising hot air is not signifi= cant and can safely be ignored for our purposes. =20 Tracy=