X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 20 Mar 2014 12:09:14 -0400 Message-ID: X-Original-Return-Path: Received: from mail-alt.hserv1.homehost.com.br ([82.102.17.194] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6788537 for lml@lancaironline.net; Thu, 20 Mar 2014 09:28:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=82.102.17.194; envelope-from=ppxsn@novellisouza.com.br Received: from [177.52.212.82] (port=50137 helo=[192.168.0.5]) by hserv1.homehost.com.br with esmtpa (Exim 4.82) (envelope-from ) id 1WQd14-001IqB-3l for lml@lancaironline.net; Thu, 20 Mar 2014 10:28:15 -0300 From: Silvio Novelli Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/alternative; boundary="Apple-Mail=_8BF6E2E9-C0D2-4AC2-A21A-E5CD037866B9" Subject: Re: [LML] Autopilot servos and L360 bobweight X-Original-Date: Thu, 20 Mar 2014 10:28:08 -0300 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: X-Mailer: Apple Mail (2.1283) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - hserv1.homehost.com.br X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - novellisouza.com.br X-Get-Message-Sender-Via: hserv1.homehost.com.br: authenticated_id: silvio@novellisouza.com.br --Apple-Mail=_8BF6E2E9-C0D2-4AC2-A21A-E5CD037866B9 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi Paul, The Tru Trak is working great since January 2010 when I starting to fly = my Lancair. My AP is a DigiFlight II and I do not have auto trim. I also = do not have trim speed potentiometer and the trim is really very = sensitive, just a fast tap on it to trim. The problem I found in one = last trip at FL 9.5 is that in the ALT HOLD mode the AP was not able to = maintain altitude forcing the plane slowly down. This did not happened = from 8.5 down. The IAS was far above 100 kt I set to minimum. I'll fly = again when back home (I'll be in Europe up to ends of April) and try to = better understand what is happing. Thank you for you interest. Silvio Novelli Lancair 320 PP-XSN +55 (14) 9.9614-3129 On 19 Jan 2014,w 12, at 11:07 AM, Paul Miller wrote: Silvio, the servos are not really altitude sensitive but if you have a = pitch trim that has reduced voltage for speed reduction, that can be = suspect. At altitude try and see if pitch trim operates by gently = holding very light pitch up or pitch down while in altitude hold mode. = You should get a response within a second or two from pitch trim. = Without pitch trim, you cannot control pitch. Have you a reduced trim = speed potentiometer? Paul Legacy tru trak On 2014-03-19, at 8:07, Silvio Novelli = wrote: > I also have a problem with my Tru Trak, it is not able to hold = altitude above 9000 ft. Any comments? Bob weight is there to better = stick force. My recommendation is to keep it.=20 >=20 > Silvio Novelli > Lancair 320 PP-XSN > +55 (14) 9.9614-3129 >=20 >=20 >=20 >=20 > On 18 Jan 2014,w 12, at 11:41 AM, John Barrett wrote: >=20 > Bob weight is there to balance the control surface . Out of balance = can carry risk of flutter. Be sure to research before changing that = relationship. >=20 > John >=20 > Sent from my iPad >=20 >=20 > On Mar 18, 2014, at 6:52 AM, "Jack Dysart" = wrote: >=20 >> My Tru Trak autopilot altitude hold is inconsistent, and opinions are = that the servo had difficulty working properly because of the mass of = the bobweight on the elevator idler arm. One possibility is to remove = the weight and expect more pitch sensitivity (lighter stick force) in = turns. Has anyone found other alternatives? >> What if the mass of the bobweight is reduced? >> =20 >> My servo is behind the seat and connected to a ring clamp on the = elevator control tube with a smaller, roughly parallel, rod with bearing = ends. >> =20 >> Jack Dysart =20 >=20 --Apple-Mail=_8BF6E2E9-C0D2-4AC2-A21A-E5CD037866B9 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Hi = Paul,

The Tru Trak is working great since January = 2010 when I starting to fly my Lancair. My AP is a DigiFlight II and I = do not have auto trim. I also do not have trim speed potentiometer and = the trim is really very sensitive, just a fast tap on it to trim. The = problem I found in one last trip at FL 9.5 is that in the ALT HOLD mode = the AP was not able to maintain altitude forcing the plane slowly down. = This did not happened from 8.5 down. The IAS was far above 100 kt I set = to minimum. I'll fly again when back home (I'll be in Europe up to ends = of April) and try to better understand what is = happing.

Thank you for you interest.

      Silvio = Novelli
 Lancair 320 PP-XSN
+55 (14) = 9.9614-3129

On 19  Jan 2014,w 12, at 11:07 AM, Paul Miller = wrote:

Silvio, the servos are not really altitude sensitive = but if you have a pitch trim that has reduced voltage for speed = reduction, that can be suspect.  At altitude try and see if pitch = trim operates by gently holding very light pitch up or pitch down while = in altitude hold mode. You should get a response within a second or two = from pitch trim.  Without pitch trim, you cannot control pitch. =  Have you a reduced trim speed = potentiometer?

Paul
Legacy tru trak

On = 2014-03-19, at 8:07, Silvio Novelli <ppxsn@novellisouza.com.br>= ; wrote:

I also have a = problem with my Tru Trak, it is not able to hold altitude above 9000 ft. = Any comments? Bob weight is there to better stick force. My = recommendation is to keep it. 

      Silvio = Novelli
 Lancair 320 PP-XSN
+55 (14) = 9.9614-3129

On 18  Jan 2014,w 12, at 11:41 AM, John Barrett = wrote:

Bob weight is there to balance the control surface . = Out of balance can carry risk of flutter.  Be sure to research = before changing that = relationship.

John

Sent from my = iPad


On Mar 18, 2014, at 6:52 AM, "Jack = Dysart" <jldysart1@gmail.com> = wrote:

My Tru Trak autopilot altitude hold is inconsistent, = and opinions are that the servo had difficulty working properly because = of the mass of the bobweight on the elevator idler arm.  One = possibility is to remove the weight and expect more pitch sensitivity = (lighter stick force) in turns.  Has anyone found other = alternatives?

What if the mass of = the bobweight is reduced?

 

My servo = is behind the seat and connected to a ring clamp on the elevator control = tube with a smaller, roughly parallel, rod with bearing = ends.

 

Jack Dysart =    


=

= --Apple-Mail=_8BF6E2E9-C0D2-4AC2-A21A-E5CD037866B9--