X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 02 May 2007 10:33:43 -0400 Message-ID: X-Original-Return-Path: Received: from mta10.adelphia.net ([68.168.78.202] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2021256 for lml@lancaironline.net; Wed, 02 May 2007 09:01:22 -0400 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.202; envelope-from=glcasey@adelphia.net Received: from [75.82.226.10] by mta10.adelphia.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20070502130012.COLU19599.mta10.adelphia.net@[75.82.226.10]> for ; Wed, 2 May 2007 13:00:12 +0000 Mime-Version: 1.0 (Apple Message framework v752.2) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-12-87631036 X-Original-Message-Id: <693C2EB8-A498-4734-9A46-19D469938E34@adelphia.net> From: Gary Casey Subject: Re: Lancair IV turbine yaw solutions? X-Original-Date: Wed, 2 May 2007 06:00:10 -0700 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.752.2) --Apple-Mail-12-87631036 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed > Some time back I posted some flight test results on the dual ventral fin installed on my ES. The yaw stability was increased by about 30%. Is that "worthwhile?" I don't know and I haven't flown much with it on, so I don't have an opinion so far. Since the tail is the same on all 4-place Lancairs I think one can assume the difference is the same for all. The relative desirability may differ. I am a little skeptical of the improvement to be gained by the leading edge "extender" as it increases the sweep angle of the airfoil, which generally reduces the lift for a given angle of attack. The ventral fins also have a high angle of attack, but they are essentially blades of zero thickness, which increases the lift at small angles of attack. Gary Casey ES N224SG > > pete z tells me that the vert stab extender is worthwhile but the > strakes make "a big difference". > > all anecdotal! > > david --Apple-Mail-12-87631036 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1

Some time back I posted some = flight test results on the dual ventral fin installed on my ES.=A0 The = yaw stability was increased by about 30%.=A0 Is that "worthwhile?"=A0 I = don't know and I haven't flown much with it on, so I don't have an = opinion so far.=A0 Since the tail is the same on all 4-place Lancairs I = think one can assume the difference is the same for all.=A0 The relative = desirability may differ.=A0 I am a little skeptical of the improvement = to be gained by the leading edge "extender" as it increases the sweep = angle of the airfoil, which generally reduces the lift for a given angle = of attack.=A0 The ventral fins also have a high angle of attack, but = they are essentially blades of zero thickness, which increases the lift = at small angles of attack.

Gary Casey
ES = N224SG

pete z tells = me that the vert stab extender is worthwhile but the strakes make "a big = difference".

all anecdotal!