X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 25 Feb 2009 08:13:21 -0500 Message-ID: X-Original-Return-Path: Received: from smtp-auth-03.mx.pitdc1.expedient.net ([206.210.66.136] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTPS id 3514720 for lml@lancaironline.net; Tue, 24 Feb 2009 23:23:52 -0500 Received-SPF: none receiver=logan.com; client-ip=206.210.66.136; envelope-from=rpastusek@htii.com Received: from HTBOB001 (static-71-178-198-10.washdc.fios.verizon.net [71.178.198.10]) by smtp-auth-03.mx.pitdc1.expedient.net (Postfix) with ESMTPA id 402E57C5EC for ; Tue, 24 Feb 2009 23:23:16 -0500 (EST) From: "Robert Pastusek" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] IVP hstab incidence (was 360 in a small-tail LNC2) X-Original-Date: Tue, 24 Feb 2009 23:23:12 -0500 X-Original-Message-ID: <062901c99700$c5e96010$51bc2030$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_062A_01C996D6.DD135810" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AcmWKscbtsKu5ZCUT4iLK75+IaZncAA1BbEg Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_062A_01C996D6.DD135810 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Colyn, At an empty weight of 2290#, the CG of my IV-P (with air conditioning) is almost two inches aft of the most forward allowable. Having set a MGWt of 3600#, I run out of CG before I can actually load to this weight with any reasonable configuration. My elevator trims up below 160 KIAS, approximately neutral at 160 KIAS, and goes progressively nose-down as the IAS increases. My translation is that the tail plane needs to generate just a bit more (down) lift to be able to fly with the stab in a neutral position. Changing the incidence of the tail plane could move it toward neutral in high speed cruise, but would adversely affect the slow speed (TO & land) trim and handling. BTW, my trim setting for TO and normal landing is the identical. I rarely need to adjust the trim in preparation for TO-unless someone bumps the trim switch while trying to arrange their "stuff" in the right seat. Bob From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Colyn Case at earthlink Sent: Monday, February 23, 2009 9:51 PM To: lml@lancaironline.net Subject: [LML] IVP hstab incidence (was 360 in a small-tail LNC2) My IVP is extremely forward CG. not out the front of the envelope, but more forward than any other IVP I know. and yet, at cruise I am trimmed several dots down from neutral, which would mean considerable elevator deflection. I'm wondering if any IVP out there has the hstab incidence set up so that the elevator is neutral at cruise? ------=_NextPart_000_062A_01C996D6.DD135810 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Colyn,

At an empty weight of 2290#, the CG of my IV-P (with air = conditioning) is almost two inches aft of the most forward allowable. Having set a = MGWt of 3600#, I run out of CG before I can actually load to this weight with = any reasonable configuration. My elevator trims up below 160 KIAS, = approximately neutral at 160 KIAS, and goes progressively nose-down as the IAS increases. My translation is that the tail plane needs to generate just a bit more = (down) lift to be able to fly with the stab in a neutral position. Changing the = incidence of the tail plane could move it toward neutral in high speed cruise, but = would adversely affect the slow speed (TO & land) trim and = handling.

BTW, my trim setting for TO and normal landing is the = identical. I rarely need to adjust the trim in preparation for TO—unless = someone bumps the trim switch while trying to arrange their “stuff” = in the right seat…

Bob

From:= Lancair = Mailing List [mailto:lml@lancaironline.net] On Behalf Of Colyn Case at = earthlink
Sent: Monday, February 23, 2009 9:51 PM
To: lml@lancaironline.net
Subject: [LML] IVP hstab incidence (was 360 in a small-tail = LNC2)

My IVP is extremely forward CG. not out the front of the envelope, = but more forward than any other IVP I know.

and yet, at cruise I am trimmed several dots down from neutral, which would = mean considerable elevator deflection.

I'm wondering if any IVP out there has the hstab incidence set up so that = the elevator is neutral at cruise?

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