Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Wed, 15 Sep 2004 18:15:20 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m16.mx.aol.com ([64.12.138.206] verified) by logan.com (CommuniGate Pro SMTP 4.2.1) with ESMTP id 412582 for lml@lancaironline.net; Wed, 15 Sep 2004 17:54:27 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.206; envelope-from=Newlan2dl@aol.com Received: from Newlan2dl@aol.com by imo-m16.mx.aol.com (mail_out_v37_r3.7.) id q.14.33dd329f (4426) for ; Wed, 15 Sep 2004 17:53:50 -0400 (EDT) From: Newlan2dl@aol.com X-Original-Message-ID: <14.33dd329f.2e7a13ed@aol.com> X-Original-Date: Wed, 15 Sep 2004 17:53:49 EDT Subject: WHAT IS KILLING LANCAIR PILOTS? X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1095285229" X-Mailer: 9.0 for Windows sub 5032 -------------------------------1095285229 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Hello Lee Wow. That's a very powerful data set you compiled there. Do you have it by Lancair type? And since so many are stall/spin accidents (tied for #1 with loss of control in IMC), I was wondering what you guys might think regarding stall strips to add buffet to the wings just prior to a stall? Perhaps giving a bit more warning to the pilots could help, but then again, I would assume most of the folks in the accidents had stall warning indicators. Also I am curious about the stall characteristics of the wings. Does anyone know how quickly these foils "stop flying" relative to other high performance aircraft? I am not saying this is a flaw, but some section shapes and planforms have more of a tendancy to have a sharp break in the stall while others can be very long in progressing. In addition, more wing tip washout can give a longer time for the stall to progress out to the tips thus allowing more of the wing to continue to "fly" but of course at some expense in speed and efficiency since the lift distribution is not uniform. The famed "Spitfire" originally had no wingtip washout on its lovely elliptical shaped wings but suffered from severe stall/spin since when it broke, the whole wing was stalled. It was aerodynamically very efficient that way but deadly so washout was added later. Just curious what some of you "Sky Gods" out there thought. Dan -------------------------------1095285229 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Hello Lee

Wow. That's a very powerful data set you compiled there. Do= you have it by Lancair type?

And since so many are stall/spin accidents (tied for #1 with loss of co= ntrol in IMC), I was wondering what you guys might think regarding stal= l strips to add buffet to the wings just prior to a stall? Perhaps giv= ing a bit more warning to the pilots could help, but then again, I woul= d assume most of the folks in the accidents had stall warning indicators.

Also I am curious about the stall characteristics of the wings. D= oes anyone know how quickly these foils "stop flying" relative to other high= performance aircraft? I am not saying this is a flaw, but some sectio= n shapes and planforms have more of a tendancy to have a sharp break in the=20= stall while others can be very long in progressing. In addition, more wing t= ip washout can give a longer time for the stall to progress out to the tips=20= thus allowing more of the wing to continue to "fly" but of course at some ex= pense in speed and efficiency since the lift distribution is not uniform.&nb= sp; The famed "Spitfire" originally had no wingtip washout on its lovely ell= iptical shaped wings but suffered from severe stall/spin since when it broke= , the whole wing was stalled. It was aerodynamically very efficient th= at way but deadly so washout was added later.

Just curious what some of you "Sky Gods" out there thought.

Dan

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