X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 16 May 2007 18:48:14 -0400 Message-ID: X-Original-Return-Path: Received: from [206.246.194.60] (HELO visi.net) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2048212 for lml@lancaironline.net; Wed, 16 May 2007 16:10:30 -0400 Received-SPF: none receiver=logan.com; client-ip=206.246.194.60; envelope-from=rpastusek@htii.com Received: from [69.143.130.212] (HELO DLHTPAX009) by visi.net (CommuniGate Pro SMTP 4.2) with ESMTP id 211047979 for lml@lancaironline.net; Wed, 16 May 2007 16:09:26 -0400 From: "Robert Pastusek" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] Re: IV-P pitch trim limiter X-Original-Date: Wed, 16 May 2007 16:09:33 -0400 X-Original-Message-ID: <01ac01c797f6$20c4dcf0$624e96d0$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01AD_01C797D4.99B33CF0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AceX8XPbdi1K7JltQaShr5tMDRKk1gAA8Flw Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_01AD_01C797D4.99B33CF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Colyn Case wrote: I'm considering limiting the travel on the elevator trim tab. Has anyone else thought about or done this? Colyn, the trim limits are normally set by the designer and verified during test to provide "hands off" flight in all normal operating modes and configurations. For the elevator/pitch trim, the most taxing is usually the takeoff and landing configuration/operating speeds. A lot of home-builts don't fully achieve this, especially in the flare to touchdown, but you might consider maintaining at least enough trim authority to achieve a neutral stick force during normal approach, even if you need to add a bit of back pressure for touchdown. Just a thought. Bob Pastusek ------=_NextPart_000_01AD_01C797D4.99B33CF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Colyn Case wrote:

I'm considering limiting the travel on the elevator trim tab.

Has anyone else thought about or done this?

Colyn, the trim limits are normally =
set by the designer and verified during test to provide “hands =
off” flight in all normal operating modes and configurations. For =
the elevator/pitch trim, the most taxing is usually the takeoff and =
landing configuration/operating speeds. A lot of home-builts don’t =
fully achieve this, especially in the flare to touchdown, but you might =
consider maintaining at least enough trim authority to achieve a neutral =
stick force during normal approach, even if you need to add a bit of =
back pressure for touchdown. Just a thought.

Bob Pastusek

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