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Tue, 18 Mar 2014 10:55:07 PDT X-Rocket-MIMEInfo: 002.001,Sm9obiwKSSB0aGluayB5b3UgYXJlIG1peGluZyB1cCB0aGUgY291bnRlcndlaWdodCBhbmQgdGhlIGJvYi13ZWlnaHQuwqAgVGhlIGNvdW50ZXJ3ZWlnaHQgaXMgaW5kZWVkIHRoZXJlIHRvIHByZXZlbnQgZmx1dHRlciBieSBtYXNzIGJhbGFuY2luZyB0aGUgY29udHJvbCBzdXJmYWNlLsKgIFJlbW92aW5nIHRoZSBib2Itd2VpZ2h0IHdpbGwgcmVkdWNlIHRoZSBzdGljayBmb3JjZS9nLsKgwqBMYW5jYWlyIGV4cGVyaW1lbnRlZCB3aXRoIHJlZHVjaW5nIG9yIGVsaW1pbmF0aW5nIHRoZSBib2Itd2VpZ2h0wqABMAEBAQE- X-Mailer: YahooMailWebService/0.8.178.641 References: <1395164037.12917.YahooMailNeo@web161205.mail.bf1.yahoo.com> X-Original-Message-ID: <1395165307.55330.YahooMailNeo@web161203.mail.bf1.yahoo.com> X-Original-Date: Tue, 18 Mar 2014 10:55:07 -0700 (PDT) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Autopilot servos and L360 bobweight X-Original-To: Lancair Mailing List In-Reply-To: <1395164037.12917.YahooMailNeo@web161205.mail.bf1.yahoo.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-852950040-486964831-1395165307=:55330" ---852950040-486964831-1395165307=:55330 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable John,=0AI think you are mixing up the counterweight and the bob-weight.=A0 = The counterweight is indeed there to prevent flutter by mass balancing the = control surface.=A0 Removing the bob-weight will reduce the stick force/g.= =A0=A0Lancair experimented with reducing or eliminating the bob-weight=A0ma= ny years ago.=A0 I don't recall the details however.=0AChris Zavatson=0AN91= CZ=0A360std=0Ahttp://www.n91cz.net/=A0 =0A=0A=0A=0AOn Tuesday, March 18, 20= 14 10:33 AM, Chris Zavatson wrote:=0A =0AJack,= =0AThe bob-weight changes the slope of the stick force gradient.=A0 It is a= lready very shallow.=A0 Removing the weight would make it even more so.=A0= =A0=0AWhat is the nature of the=A0'inconsistent' altitude hold, a long and = slow meandering (likely a static source lag issue)=A0or a short and quick m= ovement (likely a gain or sensitivity issue).=0A=0AChris Zavatson=0AN91CZ= =0A360std=0Ahttp://www.n91cz.com/=0A=0A=0A=0AOn Tuesday, March 18, 2014 6:5= 5 AM, Jack Dysart wrote:=0A =0AMy Tru Trak autopilot= altitude hold is inconsistent, and opinions are that the servo had difficu= lty working properly because of the mass of the bobweight on the elevator i= dler arm.=A0 One possibility is to remove the weight and expect more pitch = sensitivity (lighter stick force) in turns.=A0 Has anyone found other alter= natives?=0AWhat if the mass of the bobweight is reduced?=0A=A0=0AMy servo i= s behind the seat and connected to a ring clamp on the elevator control tub= e with a smaller, roughly parallel, rod with bearing ends.=0A=A0=0AJack Dys= art =A0=A0=A0 ---852950040-486964831-1395165307=:55330 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
John,
I think you are mixing up the counterweight and the bob-= weight.  The counterweight is indeed there to prevent flutter by mass = balancing the control surface.  Removing the bob-weight will reduce th= e stick force/g.  Lancair experimented with reducing or eliminati= ng the bob-weight many years ago.  I don't recall the details how= ever.
Chris Zavatson
N91CZ
360std


On Tuesday, March 18, 2014 10:33 AM, Chris Zavatson <chris_zavat= son@yahoo.com> wrote:
Jack,
The bob-= weight changes the slope of the stick force gradient.  It is already v= ery shallow.  Removing the weight would make it even more so. &nb= sp;
What is the nature of the 'inconsistent' al= titude hold, a long and slow meandering (likely a static source lag issue)&= nbsp;or a short and quick movement (likely a gain or sensitivity issue).

Chris Zavatson
N91CZ
360std=

<= br clear=3D"none">
On Tuesday, March 18,= 2014 6:55 AM, Jack Dysart <jldysart1@gmail.com> wrote:
My Tru Trak autopilot altitude hold is inconsis= tent, and opinions are that the servo had difficulty working properly becau= se of the mass of the bobweight on the elevator idler arm.  One possib= ility is to remove the weight and expect more pitch sensitivity (lighter st= ick force) in turns.  Has anyone found other alternatives?
What if the mass of the bobweight is reduce= d?
 
My servo is behind the seat and connected to a ring c= lamp on the elevator control tube with a smaller, roughly parallel, rod wit= h bearing ends.
 
Jack Dysart    


= =20


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