X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao12.cox.net ([68.230.241.27] verified) by logan.com (CommuniGate Pro SMTP 5.1c.3) with ESMTP id 1336388 for flyrotary@lancaironline.net; Thu, 17 Aug 2006 22:47:37 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.27; envelope-from=ALVentures@cox.net Received: from BigAl ([72.192.132.90]) by fed1rmmtao12.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20060818024656.FNEE29796.fed1rmmtao12.cox.net@BigAl> for ; Thu, 17 Aug 2006 22:46:56 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Alternate Air Date: Thu, 17 Aug 2006 19:47:05 -0700 Message-ID: <000001c6c270$96fe9430$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 V6.00.2900.2962 Bob; I have a ram air scoop above the strake on my Velocity, and no filter, just a SS screen. I plan to eventually put in a trapdoor on the bottom of the air duct in the cowl. Not likely that the intake could ever get clogged, but having the trapdoor open by low pressure (alternate air source) in the duct may give me an inch or more HG MAP at static runup because the scoop inlet is a bit restrictive until the plane gets up to speed. I noted on first flight the MAP was about 1" higher on climb than I have ever seen on static for the same rpm. Al -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bob White Sent: Thursday, August 17, 2006 5:35 PM To: Rotary motors in aircraft Subject: [FlyRotary] Alternate Air I would like to pose a question or two. The checklist from the DAR had alternate air as one of the items he looks for. I asked the A&P that will be doing my yearly inspection about it, and he thinks it's important and should be there. Initially I will be flying day VFR, and may want to extend that to night VFR some day. I wasn't planning on installing alternate air. I have a direct ram air intake to the throttle body with a cone filter attached to the throttle body. I can (just barely) put alternate air in but it will be a bit of a pain. So the question is, do most of you have an alternate air source in your intake system? Did the FAA inspector or DAR specifically look for it? Thanks in advance for any input. I have to decide if I'm going to just do it, or argue. :) Bob W. -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/