X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 08 Jan 2009 19:07:44 -0500 Message-ID: X-Original-Return-Path: Received: from smtp-ext-02.mx.pitdc1.expedient.net ([206.210.69.142] verified) by logan.com (CommuniGate Pro SMTP 5.2.11) with ESMTPS id 3414610 for lml@lancaironline.net; Wed, 07 Jan 2009 10:29:42 -0500 Received-SPF: none receiver=logan.com; client-ip=206.210.69.142; envelope-from=rpastusek@htii.com Received: from dlhtpax009 (unknown [65.202.210.118]) by smtp-ext-02.mx.pitdc1.expedient.net (Postfix) with ESMTPA id 926D97C5A9 for ; Wed, 7 Jan 2009 10:29:05 -0500 (EST) Reply-To: From: "Robert Pastusek" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] LNC2 AOA Pitot tube location? X-Original-Date: Wed, 7 Jan 2009 10:29:00 -0500 Organization: Holmes-Tucker International, Inc. X-Original-Message-ID: <00f201c970dc$ab5af230$0210d690$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00F3_01C970B2.C284EA30" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AclwbuLESx4w5rUSQfa9B4+FMzz+SAAa5bNQ Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_00F3_01C970B2.C284EA30 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Chris Skelt wrote: I was persuaded by the arguments cited on the List in favor of an AOA indicator and just received a Dynon AOA Pitot tube to replace the standard AN5812. It's 2 1/4 inches longer than the AN5812, and so sticks out a couple of inches in front of the leading edge. In the installation instructions Dynon recommend that the tip should be between 2 and 12 inches aft of the leading edge, which would mean I need to move the mount aft to outboard of the gear doors. This would be a pain, and would also result in a longer and circuitous route for the pitot and AOA plumbing, as would mounting it at the wingtip, etc... I don't believe I'm the first to retrofit an AOA probe, so does anyone have views or experience on whether it would function well aerodynamically? Chris, I have this system installed in my Lancair IV-P, and have been very pleased with its performance-except for a computer failure-which Advanced Flight Systems replaced under warranty. I believe having the pitot tube extend forward of the wing leading edge will not affect its performance, and may, in fact, improve it. Not being an authority on such, however, I'd suggest that you call Rob Hickman at Advanced, (503) 263-0037, or email info@advanced-flight-systems.com about this. I've found them to be most helpful and am sure they'd be willing to discuss. Good Luck; your decision to use an AOA is a good one! Bob ------=_NextPart_000_00F3_01C970B2.C284EA30 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Chris Skelt wrote:

 

I was persuaded by the arguments cited on the List in favor of an AOA = indicator and just received a Dynon AOA Pitot tube to replace the = standard AN5812. It's 2 1/4 inches longer than the AN5812, and so sticks out a couple of = inches in front of the leading edge. In the installation instructions Dynon = recommend that the tip should be between 2 and 12 inches aft of the leading edge, which would mean I need to move the mount aft to outboard = of the gear doors. This would be a pain, and would also result in a longer and circuitous route for the pitot and AOA plumbing, as would mounting it at = the wingtip, etc...

 

I don't believe I'm the first to retrofit an AOA probe, so does anyone = have views or experience on whether it would function well aerodynamically? =

 

 

Chris, I have this system installed in my Lancair IV-P, = and have been very pleased with its performance—except for a computer = failure—which Advanced Flight Systems replaced under warranty.  I believe having = the pitot tube extend forward of the wing leading edge will not affect its = performance, and may, in fact, improve it. Not being an authority on such,  = however, I’d suggest that you call Rob Hickman at Advanced, (503) 263-0037, or email = info@advanced-flight-sys= tems.com about this. I’ve found them to be most helpful and am sure = they’d be willing to discuss.


Good Luck; your decision to use an AOA is a good = one!


Bob

 

 

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