Return-Path: Received: from mail.theofficenet.com ([65.166.240.5] verified) by logan.com (CommuniGate Pro SMTP 4.2b6) with SMTP id 232107 for flyrotary@lancaironline.net; Wed, 30 Jun 2004 13:18:59 -0400 Received: (qmail 5799 invoked from network); 30 Jun 2004 17:09:36 -0000 Received: from ppp-che-029.theofficenet.com (HELO jack) (65.166.241.29) by mail.theofficenet.com with SMTP; 30 Jun 2004 17:09:36 -0000 Message-ID: <000f01c45ec6$3b095760$1df1a641@jack> From: "Jack Ford" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Temps finally down Date: Wed, 30 Jun 2004 10:18:14 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 That's the way I heard it too. Jack ----- Original Message ----- From: To: "Rotary motors in aircraft" Sent: Wednesday, June 30, 2004 7:57 AM Subject: [FlyRotary] Re: Temps finally down > Guy's, > I don't know a lot about this but I'll dare to comment anyway. > Many planes were built with a scoop way back on the fuse. > The German military thought the little scoop back on the fuse was > too risky so they had it moved to the front. This caused the prop to > approach the inlet, pushing air into the rad, and as it passed by it > would pull the air back out again causing overheating problems. > North American solved this by moving the scoop back to where > it is now. The little scoops back on the fuse were still having > problems and someone came up with the notion that the boundry > layer was deflecting off the fuse and into the scoop, causing > an air dam. N.A.s answer to this was to pull the rad inlet away > from the fuse and the boundry layer. It seems to have worked. > Hope I'm not too far off here. > Larry Mac Donald > Rochester N.Y. > do not archive > > > On Wed, 30 Jun 2004 07:52:21 -0400 "Steve Brooks" > writes: > > Ed, > > I would like to have more information on the reason for keeping the > > boundary layer air out. My current scoop is open, and lets in both. > If the > > boundary layer air needs to be excluded, then my next scoop will have > to be > > like the P51 scoop which does exclude it. I never really understood > why. > > Looks like I may have to have another look at Bulents' scoop. His > > is made like the P51. > > > > Steve > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html >