X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from fed1rmmtao103.cox.net ([68.230.241.43] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2024499 for flyrotary@lancaironline.net; Thu, 03 May 2007 20:13:21 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.43; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao103.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070504001229.RLWE1318.fed1rmmtao103.cox.net@fed1rmimpo01.cox.net> for ; Thu, 3 May 2007 20:12:29 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo01.cox.net with bizsmtp id uoCU1W00g1xAn3c0000000; Thu, 03 May 2007 20:12:29 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Cooling area drag Date: Thu, 3 May 2007 17:12:36 -0800 Message-ID: <000001c78de9$4d5e71c0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C78DA6.3F3B31C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C78DA6.3F3B31C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 I had a local hydraulic wizzard calculate my coolers and lines. He = thinks the stock pump will handle it. #8 lines, coolers inseries =20 Bob Mears Bob; =20 How many feet of line? Lots of -8 lines, and two coolers in series = could have significant pressure drop, certainly before the temp comes up. = With the pressure control at the far end, it is subjecting the coolers and = the upstream line to that much higher pressure. I don't know for certain = that it is a problem, but my engineering judgment suggests it's not the best. = I did some sort of analysis on mine with my 2-3 ft of line on each side of = the cooler, and looking at the 16 gpm oil flow we measured on the dyno, I = went to -10 lines. Rotaries have significantly higher oil flow rates than = their piston cousins. =20 I think someone else suggested tipping the rad the other way, and moving = the inlet scoop forward and up. In addition to reducing the corners the air = has to make, it could have the advantage of better flow and lower drag = because it puts the inlet more into the 'compression' zone at the front = (external diffusion). May allow a smaller inlet. =20 FWIW, =20 Al ------=_NextPart_000_0001_01C78DA6.3F3B31C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I had a local hydraulic wizzard calculate my = coolers and lines. He thinks the stock pump will handle it. #8 lines, coolers = inseries

Bob Mears

Bob;

How many feet of line? Lots = of -8 lines, and two coolers in series could have significant pressure drop, certainly before the temp comes up. With the pressure control at = the far end, it is subjecting the coolers and the upstream line to that much = higher pressure. I don’t know for certain that it is a problem, but my engineering = judgment suggests it’s not the best. I did some sort of analysis on = mine with my 2-3 ft of line on each side of the cooler, and looking at the 16 gpm = oil flow we measured on the dyno, I went to -10 lines. Rotaries have significantly higher oil flow rates than their piston = cousins.

I think someone else suggested = tipping the rad the other way, and moving the inlet scoop forward and up. = In addition to reducing the corners the air has to make, it could have the = advantage of better flow and lower drag because it puts the inlet more into the = ‘compression’ zone at the front (external diffusion). May allow a smaller = inlet.

FWIW,

Al

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