X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTP id 623102 for flyrotary@lancaironline.net; Tue, 02 Aug 2005 21:06:29 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=ceengland@bellsouth.net Received: from ibm57aec.bellsouth.net ([209.215.60.252]) by imf17aec.mail.bellsouth.net with ESMTP id <20050803010541.JSPW4819.imf17aec.mail.bellsouth.net@ibm57aec.bellsouth.net> for ; Tue, 2 Aug 2005 21:05:41 -0400 Received: from [127.0.0.1] (really [209.215.60.252]) by ibm57aec.bellsouth.net with ESMTP id <20050803010540.ZXMQ4854.ibm57aec.bellsouth.net@[127.0.0.1]> for ; Tue, 2 Aug 2005 21:05:40 -0400 Message-ID: <42F0185F.1010107@bellsouth.net> Date: Tue, 02 Aug 2005 20:05:35 -0500 From: Charlie England User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Pressure differential References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Might be even worse news sitting at the hold short line waiting for the three on downwind & that Cessna on a 4 mile final.... Ed Anderson wrote: > Hard to say, Ernest. So many other factors come to play such as size, > thickness, fin density of the radiator. However, I do recall that > when Tracy Crook reported on the pressure differential across his GM > cores it was on the order of 5" - 5 1/2" of water. I think the > figure of 1" during climbout may not be good news - but again as you > point out this is on a surface and not in a duct. > > Ed A > > ----- Original Message ----- From: "Ernest Christley" > > To: "Rotary motors in aircraft" > Sent: Tuesday, August 02, 2005 5:36 PM > Subject: [FlyRotary] Pressure differential > > >> Another Delta builder has done some testing and come back to me with >> some hard data for the pressure differential between the wheel wells >> and the wing's trailing edge. A mamometer with a line terminated in >> both places gave: >> - 1/16" differential during taxi >> - 1.25" takeoff/touchdown >> - 1" during climb out (100 mph IAS) >> - 2.25" with the gear down >> - 2" during base and final >> >> I sure someone has, but I don't remember anyone quoting the pressure >> differential across their radiators. Do these numbers look >> workable? The airplane doesn't have a scoop dropping down as tested, >> and the front edge of the wheel well is squared off. I would expect >> these modifications to significantly increase the numbers, but if >> this is sufficient neither one may be necessary. >> >> These numbers are not from a duct with air passing through it, but >> just points on the solid surface of the aircraft. Will that make a >> huge difference? >> >> -- >> ,|"|"|, | >> ----===<{{(oQo)}}>===---- Dyke Delta | >> o| d |o www.ernest.isa-geek.org | >