X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Wed, 18 Nov 2009 09:33:27 -0500 Message-ID: X-Original-Return-Path: Received: from nschwmtas04p.mx.bigpond.com ([61.9.189.146] verified) by logan.com (CommuniGate Pro SMTP 5.3c2) with ESMTP id 3980601 for lml@lancaironline.net; Wed, 18 Nov 2009 06:16:26 -0500 Received-SPF: pass receiver=logan.com; client-ip=61.9.189.146; envelope-from=frederickmoreno@bigpond.com Received: from nschwotgx01p.mx.bigpond.com ([58.170.181.250]) by nschwmtas04p.mx.bigpond.com with ESMTP id <20091118111550.QMQW3986.nschwmtas04p.mx.bigpond.com@nschwotgx01p.mx.bigpond.com> for ; Wed, 18 Nov 2009 11:15:50 +0000 Received: from Razzle ([58.170.181.250]) by nschwotgx01p.mx.bigpond.com with ESMTP id <20091118111549.TOBD1743.nschwotgx01p.mx.bigpond.com@Razzle> for ; Wed, 18 Nov 2009 11:15:49 +0000 From: "Frederick Moreno" X-Original-To: "Lancair Mail" Subject: FW: What could be causing this in-flight noise on my Legacy? X-Original-Date: Wed, 18 Nov 2009 20:15:41 +0900 X-Original-Message-ID: <006501ca6840$79604b70$6c20e250$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0066_01CA688B.E947F370" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Acpn4SWfsaj8rJnqQue5gp0bSZXi8gAXyyqQ Content-Language: en-au X-RPD-ScanID: Class unknown; VirusThreatLevel unknown, RefID str=0001.0A150202.4B03D766.0047,ss=1,fgs=0 X-SIH-MSG-ID: qB81FtD+TFa2kTAvmTy2alorgFm6/gF5uMhSBI0wt0lHEVbGsd/fRMq9cqtA34zj1C4rY06VQD5mc63sTY7QuNi1K7lRSrLZ5/E2 This is a multi-part message in MIME format. ------=_NextPart_000_0066_01CA688B.E947F370 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit As the airplane decelerated thru 89 knots TAS, once or twice a sound was heard that can best be described as a door closing shut firmly. It sounded like a landing gear door being slapped against the fuselage/cowling by the slip stream. Jay, you could be hearing flow detaching and reattaching at the inboard wing. I had this happen on our RV6 when practicing stalls. The sound the RV made was a loud FLUPP! Easy way to test: Put tufts across the top of the wing (inboard both sides) and watch for flow separation concurrent with the noise. If you see it.. Fred Moreno ------=_NextPart_000_0066_01CA688B.E947F370 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

As the airplane decelerated thru 89 knots TAS, once or twice a sound was heard that can best be described as a door closing shut firmly. I= t sounded like a landing gear door being slapped against the fuselage/cowling by the = slip stream.

Jay, you could be hearing flow detaching and reattaching at = the inboard wing. I had this happen on our RV6 when practicing stalls.&nb= sp; The sound the RV made was a loud FLUPP!

Easy way to test: Put tufts across the top of the wing (inbo= ard both sides) and watch for flow separation concurrent with the noise. If you see it….

Fred Moreno

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