X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 20 Oct 2007 17:59:05 -0400 Message-ID: X-Original-Return-Path: Received: from mail01.syd.optusnet.com.au ([211.29.132.182] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTPS id 2397272 for lml@lancaironline.net; Sat, 20 Oct 2007 10:19:48 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.182; envelope-from=fredmoreno@optusnet.com.au Received: from fred (optussatellitebintb.22bjipb002.optus.net.au [59.154.24.148]) (authenticated sender fredmoreno) by mail01.syd.optusnet.com.au (8.13.1/8.13.1) with ESMTP id l9KEIpAc008648 for ; Sun, 21 Oct 2007 00:18:59 +1000 From: "Fred Moreno" X-Original-To: "Lancair Mail" Subject: Leading Edge Tape - speed penalty X-Original-Date: Sat, 20 Oct 2007 22:24:59 +0800 X-Original-Message-ID: <009301c81325$059d9430$c211140a@fred> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0094_01C81368.13C0D430" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6822 Thread-Index: AcgTJP3W3+55hMqRQzOVQX6BrDljdQ== X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0094_01C81368.13C0D430 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable While on the topic of leading edge tape, I recall reports in the distant past that such tapes extracted a speed penalty, particularly on the IV, because it caused the boundary layer to prematurely transition from = laminar to turbulent. What is the experience of those who have done before and after flight tests? =20 I recall querying the 3M rep at OSH about this. His answer: take some = clear finish paint and with a fine brush and a lot of patience, fill in the = step behind the tape. He said it flows and fills nicely. =20 =20 On top maybe, but the wing is supposed to be 60% laminar on the bottom, = and 40% on the top, if memory serves correctly (always a worry). So I = guess you have to apply tape and paint while the wing can be inverted. =20 =20 Has anyone experimented with this "fix" and what results did you record? =20 Or is there another way? =20 Or is it a non-issue? =20 =20 Curious Fred, threatening to fly early next year - IV USB ------=_NextPart_000_0094_01C81368.13C0D430 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

While on the topic of leading edge tape, I = recall reports in the distant past that such tapes extracted a speed penalty, particularly on the IV, because it caused the boundary layer to = prematurely transition from laminar to turbulent.  What is the experience of = those who have done before and after flight tests?

 

I recall querying the 3M rep at = OSH about = this.  His answer: take some clear finish paint and with a fine brush and a lot of patience, fill in the step behind the tape.  He said it flows and = fills nicely. 

 

On top maybe, but the wing is supposed to be = 60% laminar on the bottom, and 40% on the top, if memory serves correctly = (always a worry).   So I guess you have to apply tape and paint while = the wing can be inverted. 

 

Has anyone experimented with this “fix” = and what results did you record?

 

Or is there another way?

 

Or is it a non-issue?

 

 

Curious Fred, threatening to fly early next = year - IV USB

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