Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Sat, 04 Sep 2004 08:02:11 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d05.mx.aol.com ([205.188.157.37] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 392602 for lml@lancaironline.net; Sat, 04 Sep 2004 07:59:40 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.37; envelope-from=Newlan2dl@aol.com Received: from Newlan2dl@aol.com by imo-d05.mx.aol.com (mail_out_v37_r3.4.) id q.62.4319a1cf (4116) for ; Sat, 4 Sep 2004 07:58:49 -0400 (EDT) From: Newlan2dl@aol.com X-Original-Message-ID: <62.4319a1cf.2e6b07f9@aol.com> X-Original-Date: Sat, 4 Sep 2004 07:58:49 EDT Subject: Re: [LML] Re: Engine Cooling X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1094299129" X-Mailer: 9.0 for Windows sub 5032 -------------------------------1094299129 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit One of the things I've always felt was a bit odd was that so little time aned thought that is spent on shaping the way the air is allowed to exit through the bottom of the cowling. For pue fluid dynamic reasons, it should be a lot rounder on the back, not just spilling off of a square corner from the firewall. For my race boats, I "sculpt" all through hull exits to have a sharp leading edge and rounded trailing edge and also aim them aft to further reduce drag. This helps the water flow off of the hull more cleanly than just having a hard corner. It would take some room away in the floor by the rudder pedals but enable more air to pass through with less drag since the rounding of the edge there would create a low pressur area and tend to suck out the air more efficiently. We use the same principle in some types of bailers for racing dingys and rowing shells. These have little doors that open and suck out water in the boat or others have cavities molded in with just a plug that sucks out the water at relatively low speed. Dan Newland -------------------------------1094299129 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
One of the things I've always felt was a bit odd was that so little tim= e aned thought that is spent on shaping the way the air is allowed to exit t= hrough the bottom of the cowling.  For pue fluid dynamic reasons, it sh= ould be a lot rounder on the back, not just spilling off of a square corner=20= from the firewall.  For my race boats, I "sculpt" all through hull exit= s to have a sharp leading edge and rounded trailing edge and also aim them a= ft to further reduce drag.  This helps the water flow off of the hull m= ore cleanly than just having a hard corner.  It would take some room aw= ay in the floor by the rudder pedals but enable more air to pass through wit= h less drag since the rounding of the edge there would create a low pressur=20= area and tend to suck out the air more efficiently.  We use the same pr= inciple in some types of bailers for racing dingys and rowing shells. =20= These have little doors that open and suck out water in the boat or others h= ave cavities molded in with just a plug that sucks out the water at relative= ly low speed.
 
Dan Newland
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