X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m14.mx.aol.com ([64.12.138.204] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 1045324 for flyrotary@lancaironline.net; Fri, 24 Mar 2006 12:37:56 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.204; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m14.mx.aol.com (mail_out_v38_r7.3.) id q.2ee.3cc5cec (30740) for ; Fri, 24 Mar 2006 12:37:05 -0500 (EST) From: WRJJRS@aol.com Message-ID: <2ee.3cc5cec.31558841@aol.com> Date: Fri, 24 Mar 2006 12:37:05 EST Subject: Re: [FlyRotary] Re: Test Stand and FWF pics To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1143221825" X-Mailer: 9.0 SE for Windows sub 5022 X-Spam-Flag: NO -------------------------------1143221825 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 3/24/2006 8:12:29 AM Pacific Standard Time, bhughes@qnsi.net writes: Ernest, RV10. Skinny front tapered to the firewall. The sides are lower pressure than the nose on a conventional cowl. In this arrangement I think NACA's may work well. Bobby Bobby, Before going side INLET I suggest that you go to Peter Garrison's site and check out his plot for his Melmoth 2 CFD. The plots won't be identical to an RV-10 but are made on an aircraft of similar size and configuration. (4 seater standard Lyc engine etc.) We usually want our intakes in a HIGH pressure area and exits in a low pressure area. You are correct that the sides of the cowling are usually LOWER pressure than the front. Go to _www.melmoth2.com_ (http://www.melmoth2.com) click on the topics subhead and then CFD. He has had a close association with some really hot designers like Rutan and John Roncz. Roncz ran his design through a high-end CFD program in the design stages and this led to his unusual updraft cooling design. Noting his cowl shape is fairly standard. Checking the pressure plots shows that the sides might not be a good spot for the radiator intakes. Your radiator locations aren't bad. This is the location I have considered for my rads as well. but angling the "noses" in and applying duct work from a front inlet would be a good idea. As Tracy says YMMV, but checking these pressure plots is a good idea. I like the idea of side EXITS similar to the Thorp 18 since the area at the rear of the cowling at the firewall is starting to go low pressure. Carefull contour of the exit to place the exit air close to freestream angle would be necessary as well. Of course the typical botton exit is also OK. Good luck. Bill Jepson -------------------------------1143221825 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 3/24/2006 8:12:29 AM Pacific Standard Time,=20 bhughes@qnsi.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000=20 size=3D2>Ernest,

RV10. Skinny front tapered to the firewall. The si= des=20 are lower pressure
than the nose on a conventional cowl. In this=20 arrangement I think NACA's
may work well.

Bobby=20
Bobby, Before going side INLET I suggest that you go to Peter Garrison'= s=20 site and check out his plot for his Melmoth 2 CFD. The plots won't be identi= cal=20 to an RV-10 but are made on an aircraft of similar size and configuration. (= 4=20 seater standard Lyc engine etc.) We usually want our intakes in a HIGH press= ure=20 area and exits in a low pressure area. You are correct that the sides of the= =20 cowling are usually LOWER pressure than the front. Go to
www.melmoth2.com click on the t= opics=20 subhead and then CFD. He has had a close association with some really hot=20 designers like Rutan and John Roncz. Roncz ran his design through a high-end= CFD=20 program in the design stages and this led to his unusual updraft cooling des= ign.=20 Noting his cowl shape is fairly standard. Checking the pressure plots shows=20= that=20 the sides might not be a good spot for the radiator intakes. Your radiator=20 locations aren't bad. This is the location I have considered for my rads as=20 well. but angling the "noses" in and applying duct work from a front inlet w= ould=20 be a good idea. As Tracy says YMMV, but checking these pressure plots is a g= ood=20 idea. I like the idea of side EXITS similar to the Thorp 18 since the area a= t=20 the rear of the cowling at the firewall is starting to go low pressure. Care= full=20 contour of the exit to place the exit air close to freestream angle would be= =20 necessary as well. Of course the typical botton exit is also OK. Good=20 luck.
Bill Jepson
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