X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-01.southeast.rr.com ([24.25.9.100] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1145543 for flyrotary@lancaironline.net; Wed, 07 Jun 2006 20:18:09 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-111-186.carolina.res.rr.com [24.74.111.186]) by ms-smtp-01.southeast.rr.com (8.13.6/8.13.6) with SMTP id k580HKTJ020342 for ; Wed, 7 Jun 2006 20:17:22 -0400 (EDT) Message-ID: <003d01c68a90$f07c75d0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: RV6 pressure distribution Date: Wed, 7 Jun 2006 20:17:33 -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 6.00.2900.2869 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 X-Virus-Scanned: Symantec AntiVirus Scan Engine I don't know the AOA but I would assume fairly close to Straight and Level. Its generally accepted that in a climb with the nose high that the bottom aft part of the cowl will see more pressure than in S&L. This is one thing that tends to work against cowl flaps - you open them to create a lower pressure area to draw more air through the engine compartment, but in a climb the exit area is in an area of slightly higher pressure. This sort of counteracts some of the effectiveness of a cowl flap. That is why you sometime see cowl flaps on a few of older GA aircraft on the lower side of the cowl rather than the bottom. But, unless upside down, I would bet the top of the cowl (tractor installations) generally is a region of lower pressure. My 0.02 Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com ----- Original Message ----- From: "Ernest Christley" To: "Rotary motors in aircraft" Sent: Wednesday, June 07, 2006 1:17 PM Subject: [FlyRotary] Re: RV6 pressure distribution > kenpowell@comcast.net wrote: > >> Bill, >> The attached RV6 pressure distribution should help see 'why' a louver on >> the front/top of the cowl should work well. > > What is the AOA for this rendering? There could be radical differences > between Vx, Vy and Vne configurations. > > -- > ,|"|"|, Ernest Christley | > ----===<{{(oQo)}}>===---- Dyke Delta Builder | > o| d |o www.ernest.isa-geek.org | > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ >