X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 09 Jun 2009 11:26:03 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-spurfowl.atl.sa.earthlink.net ([209.86.89.66] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3675910 for lml@lancaironline.net; Mon, 08 Jun 2009 17:33:33 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.66; envelope-from=douglasbrunner@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=kh27yKJ6lTt//rHXVWQ0tLBvOojOpqiBXp4+19IzhaucTcrGA7UBew+y8m8+CL8g; h=Received:Message-ID:From:To:References:In-Reply-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=DougsLaptop) by elasmtp-spurfowl.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1MDmSh-00013E-SI for lml@lancaironline.net; Mon, 08 Jun 2009 17:32:59 -0400 X-Original-Message-ID: <5EAC2C5B5DF7422BAA251BAEB21FA129@DougsLaptop> From: "Douglas Brunner" X-Original-To: "Lancair Mailing List" References: In-Reply-To: Subject: Re: [LML] Re: Tru Trak Yaw Damper X-Original-Date: Mon, 8 Jun 2009 17:32:05 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A6_01C9E85F.0AB4AD80" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6001.18000 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 X-ELNK-Trace: ad85a799c4f5de37c2eb1477c196d22294f5150ab1c16ac00c3604e638927e741cf01c979844011402279b560e523003350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 74.93.196.177 This is a multi-part message in MIME format. ------=_NextPart_000_00A6_01C9E85F.0AB4AD80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jack, Many of us have the TruTrak autopilot. It has a yaw damper as an = option. Do you know if the yaw damper option on the TruTrak has a high enough = frequency to be of value? D. Brunner N241DB On another point a high frequency yaw damper (it must react quickly = to be of value) makes a huge difference in the handling qualities of = most aircraft in turbulence, but the autopilot servo used for a yaw = damper, that I test flew in a Lancair was not capable of responding fast = enough to make a significant difference. A yaw damper will not reduce = the requirement for right rudder on takeoff, climb or descent. What it = really reduces the tendency is the tendency to have yaw excursions and = dutch rolls. =20 I flew a test at Edwards where a high frequency yaw damper was = installed in a Twin Comanche and the difference was very noticeable. So = it does work in GA aircraft. ------=_NextPart_000_00A6_01C9E85F.0AB4AD80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Jack,
 
Many of us have the TruTrak = autopilot.  It has=20 a yaw damper as an option.
 
Do you know if the yaw damper option on = the TruTrak=20 has a high enough frequency to be of value?
 
D. Brunner
N241DB

  On another point a high frequency yaw damper (it must = react=20 quickly to be of value) makes a huge difference in the handling = qualities of=20 most aircraft in turbulence, but the autopilot servo used for a yaw = damper,=20 that I test flew in a Lancair was not capable of responding fast = enough to=20 make a significant difference. A yaw damper will not reduce the = requirement=20 for right rudder on takeoff, climb or descent. What it really reduces = the=20 tendency is the tendency to have yaw excursions and dutch rolls.
 
   I flew a test = at Edwards=20 where a high frequency yaw damper was installed in a Twin Comanche and = the=20 difference was very noticeable. So it does work in GA=20 aircraft.
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