X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 31 Jul 2007 05:48:25 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-curtail.atl.sa.earthlink.net ([209.86.89.64] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2221474 for lml@lancaironline.net; Mon, 30 Jul 2007 23:41:02 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.64; envelope-from=douglasbrunner@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=o95lKc9MCj9L8KDQe9pMz59oWD8IAntoGgXwEX50Gz64tq85EyXPUUCAj2x3Joea; h=Received:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [74.93.196.177] (helo=DFWK3391) by elasmtp-curtail.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1IFiav-00047D-Uj for lml@lancaironline.net; Mon, 30 Jul 2007 23:40:26 -0400 X-Original-Message-ID: <002101c7d324$83912780$1bd0a60a@DFWK3391> From: "Douglas Brunner" X-Original-To: "Mailing List Lancair" Subject: Template of Leading Edges X-Original-Date: Mon, 30 Jul 2007 23:40:17 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001E_01C7D302.FC3CD930" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-ELNK-Trace: ad85a799c4f5de37c2eb1477c196d22294f5150ab1c16ac0c864d17e3813b99af61b6b106e5693b5a23b68ffd1b2a34d350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 74.93.196.177 This is a multi-part message in MIME format. ------=_NextPart_000_001E_01C7D302.FC3CD930 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I saw a very nice Legacy at Oshkosh owned by Allen Frazier. What was = most impressive was his reported top speed of 263 ktas at 7,500. (for = the cynics out there, he described what sounded to me like an accurate = method for determining his speed) I spent some time talking to him to try to find out his "secret" - why = is his plane so fast? Apparently, in a former life, he was an = aeronautical engineer and during his build he spent a lot of time paying = attention to aerodynamic details including his cowl inlets (which he = narrowed slightly) and his leading edges which he spent a lot of time = getting right. As far as I recall, he didn't use any of the available = "speed mods". (Allen - please correct me if I am wrong) This lead me to thinking - after we have finished closing the wings, h. = stab and rudders, put on the BIDS, sanded, put on micro and sanded = again: a.. How close are we to the designed airfoil? b.. Is it possible that we may have squeezed the wing too tight and = made it too narrow or added too much micro and made it too blunt? c.. Can we get the correct airfoil by hand sanding? d.. How do we know what the correct airfoil is - by eyeball? e.. Is there a better way? I am thinking of "templating" my leading edges - getting a template that = is the correct airfoil and attempting to get the leading edges as close = to design as possible. a.. Does this make sense? b.. Am I wasting my time chasing 1 or 2 knots? c.. What is the best method of getting the correct airfoil? d.. Has anyone else done this? D. Brunner N241DB 90% done 30% to go ------=_NextPart_000_001E_01C7D302.FC3CD930 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I saw a very nice Legacy at Oshkosh = owned by Allen=20 Frazier.  What was most impressive was his reported top speed of = 263 ktas=20 at 7,500.  (for the cynics out there, he described what sounded to = me like=20 an accurate method for determining his speed)
 
I spent some time talking to him to try = to find out=20 his "secret" - why is his plane so fast?  Apparently, in a former = life, he=20 was an aeronautical engineer and during his build he spent a lot of time = paying=20 attention to aerodynamic details including his cowl inlets (which he = narrowed=20 slightly) and his leading edges which he spent a lot of time getting=20 right.  As far as I recall, he didn't use any of the available = "speed=20 mods".  (Allen - please correct me if I am wrong)
 
This lead me to thinking - after we = have finished=20 closing the wings, h. stab and rudders, put on the BIDS, sanded, put on = micro=20 and sanded again:
  • How close are we to the designed=20 airfoil?
  • Is it possible that we may have = squeezed the=20 wing too tight and made it too narrow or added too much = micro and=20 made it too blunt?
  • Can we get the correct airfoil by hand = sanding?
  • How do we know what the correct = airfoil is - by=20 eyeball?
  • Is there a better = way?
I am thinking of "templating" my = leading edges -=20 getting a template that is the correct airfoil and attempting to get the = leading=20 edges as close to design as possible.
  • Does this make sense?
  • Am I wasting my time chasing 1 or 2=20 knots?
  • What is the best method of getting the = correct=20 airfoil?
  • Has anyone else done = this?
 
D. Brunner
N241DB
90% done 30% to go
 
 
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