X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-da06.mx.aol.com ([205.188.169.203] verified) by logan.com (CommuniGate Pro SMTP 5.3.11) with ESMTP id 4657213 for flyrotary@lancaironline.net; Tue, 28 Dec 2010 21:27:47 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.169.203; envelope-from=Bktrub@aol.com Received: from imo-da03.mx.aol.com (imo-da03.mx.aol.com [205.188.169.201]) by imr-da06.mx.aol.com (8.14.1/8.14.1) with ESMTP id oBT2R5LY028077 for ; Tue, 28 Dec 2010 21:27:05 -0500 Received: from Bktrub@aol.com by imo-da03.mx.aol.com (mail_out_v42.9.) id q.fdd.8e80176 (34970) for ; Tue, 28 Dec 2010 21:27:01 -0500 (EST) Received: from smtprly-da01.mx.aol.com (smtprly-da01.mx.aol.com [205.188.249.144]) by cia-da07.mx.aol.com (v129.7) with ESMTP id MAILCIADA077-5bab4d1a9c7133e; Tue, 28 Dec 2010 21:27:01 -0500 Received: from webmail-d027 (webmail-d027.sim.aol.com [205.188.167.86]) by smtprly-da01.mx.aol.com (v129.5) with ESMTP id MAILSMTPRLYDA012-5bab4d1a9c7133e; Tue, 28 Dec 2010 21:26:57 -0500 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Extraction Duct- RV10- input needed Date: Tue, 28 Dec 2010 21:26:57 -0500 X-AOL-IP: 108.3.31.54 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: bktrub@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CD75170028B526_1B38_C36E4_webmail-d027.sysops.aol.com" X-Mailer: AOL Webmail 33069-STANDARD Received: from 108.3.31.54 by webmail-d027.sysops.aol.com (205.188.167.86) with HTTP (WebMailUI); Tue, 28 Dec 2010 21:26:57 -0500 Message-Id: <8CD75170015AA1E-1B38-51D8B@webmail-d027.sysops.aol.com> X-Spam-Flag:NO X-AOL-SENDER: Bktrub@aol.com ----------MB_8CD75170028B526_1B38_C36E4_webmail-d027.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" I think you are on the right track using the exhaust as an eductor. You'll= use the energy of the exhaust to speed up the air exiting the cowl. Very= elegant solution. Brian Trubee -----Original Message----- From: Bobby J. Hughes To: Rotary motors in aircraft Sent: Tue, Dec 28, 2010 5:13 pm Subject: [FlyRotary] Extraction Duct- RV10- input needed I've been thinking about building an extraction duct (next winter) for my= RV10. My exit area is overly large and I'm sure I have excessive cooling= drag. The lower fairing ends 5" below and 1" behind the firewall. The ext= raction duct would join the existing lower fairing. This is an old picture= and my muffler is already hanging under the belly. The grid lines in the= excel attachment are at 1". =20 =20 Bobby =20 =20 =20 =20 -- omepage: http://www.flyrotary.com/ rchive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.= html =3D ----------MB_8CD75170028B526_1B38_C36E4_webmail-d027.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii"
I think you are on the right track using the exhaust as an eductor.= You'll use the energy of the exhaust to speed up the air exiting the cowl= . Very elegant solution.
Brian Trubee



-----Original Message-----
From: Bobby J. Hughes <bhughes@qnsi.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, Dec 28, 2010 5:13 pm
Subject: [FlyRotary] Extraction Duct- RV10- input needed

I've been thinking about building an extraction duct (next wi= nter)  for my RV10.  My exit area is overly large and I'm= sure I have excessive cooling drag. The lower fairing ends 5" below and= 1" behind the firewall. The extraction duct would join the existing lower= fairing. This is an old picture and my muffler is already hanging under= the belly. The grid lines in the excel attachment are at 1".
 
 
Bobby
 
 
 
 

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