X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 50 [XX] Return-Path: Received: from smtp.knology.net ([24.214.63.101] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTPS id 2024723 for flyrotary@lancaironline.net; Thu, 03 May 2007 23:00:35 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.214.63.101; envelope-from=rv7rotary@knology.net Received: (qmail 15193 invoked by uid 0); 4 May 2007 02:59:27 -0000 Received: from unknown (HELO Silver) (24.96.145.240) by smtp1.knology.net with SMTP; 4 May 2007 02:59:27 -0000 From: "Chris Sargent" To: "Rotary motors in aircraft" Subject: Cooling system design references from NACA Date: Thu, 3 May 2007 21:59:28 -0500 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 Importance: Normal In-Reply-To: Tony, Here are some of old NACA references that have good info on duct and = cooling system design. You have to wade through some theory to find the = gems. - Getting rid of rumble in belly ducting. Looks like it was NACA = investigating early P-51 belly-scoop design problem. They moved the = inlet away from the belly and redesigned the shape of the duct inlet to = eliminate the rumble caused by boundary layer turbulence. Has pictures = like your diagram on pages 14-17.=20 http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930092694_19930926= 94.pdf - Cooling Ducts - Boundary Layer Effects, NACA. Page 16 has a good = diagram. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930093223_19930932= 23.pdf - Method for Design of Cooling Systems, NACA. Page 27 has a pic showing = pressure distribution across a duct like yours. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930093155_19930931= 55.pdf - Basic duct theory: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090921_19930909= 21.pdf - Excellent "How-To" on designing your own NACA ducts for cooling (not = exactly what you're looking for, but could be useful). See diagrams on = pages 31-35. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930093809_19930938= 09.pdf - Wing-duct Cooling System. Page 21 shows how guide vanes can be used = to redirect airflow. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930081737_19930817= 37.pdf Chris Sargent -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On = Behalf Of tonyslongez@cox.net Sent: Thursday, May 03, 2007 7:35 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Cooling area drag Ed How does this look? Do I have the right idea ? the drawing is not to scale but that's the jist of it. Tony