Return-Path: Received: from mail.tsisp.com ([65.23.108.44] verified) by logan.com (CommuniGate Pro SMTP 4.2b5) with ESMTP-TLS id 142219 for flyrotary@lancaironline.net; Sun, 06 Jun 2004 21:47:08 -0400 Received: from stevehome by mail.tsisp.com (Technical Support Inc.) with SMTP id CQA74584 for ; Sun, 06 Jun 2004 21:46:40 -0400 Reply-To: From: "Steve Brooks" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: opinion Date: Sun, 6 Jun 2004 21:47:57 -0400 Message-ID: <008f01c44c31$75fa4160$6400a8c0@WORKGROUP.local> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2910.0) In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 John, After the inlet, it does expand into the plenum. Mine is not as tall as yours, but it is pretty tall and the front end and is the width of the radiator. I don't want to lose races, but I don't want to burn up the engine either. If I make the scoop removable, I can always remove it, or modify it if I figure out a better way. To increase the expansion area, I would have to modify the lower cowling (again) The cowlings are heavy enough now that I probably will redo them sometime,. I could probably save 15 lbs real easy between both of them. I'm looking at the scoop as a stop-gap measure to get the temps down, and then figure out a better mousetrap, while still flying. I would really like to understand this expansion area more, before attempting another cowling. I only want to build it one time. If you recall, I started with the plans cowling from Featherlite, and modified it to work with the rotary. The bottom NACA inlet area is the stock portion. I modified the aft area )lower) to accommodate the radiator. I've also considered installing deflectors inside the plenum to help the air flow through the radiator and air cooler. Right now I'm just letting it find it's way in, up, and through, which isn't real efficient. I'm also stealing engine intake air fro the plenum. At high RPM's that is probably pretty significant. I could move it to one of the armpit scoops without a whole lot of trouble. Steve -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John Slade Sent: Sunday, June 06, 2004 9:22 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: opinion > The 1-3/4 is from the fuselage to the inside of the scoop. Measuring from > the NACA which is recessed would be about another 1-3/4 for a total of > 3-1/2". Maybe I didn't explain that very well. OK, then. So you're NACA is the same size as mine. I think Greg Richter may have gone the direction you're proposing - add more scoops and it'll cool. I think he had a top speed problem (now solved with a turbine :). Do you have any kind of internal expansion area as described by Terry? I'd suggest that this would be the place to start... unless you're prepared to loose all the races we have later :) Regards, John >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html