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From: John Barrett <2thman1@gmail.com>
Subject: Re: [LML] Re: Autopilot servos and L360 bobweight
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Thanks for the enlightenment, Chris and others. I did assume the discussion=
was about a counterweight system.
John
Sent from my iPad
> On Mar 18, 2014, at 12:14 PM, Chris Zavatson <chris_zavatson@yahoo.com> wr=
ote:
>=20
> John,
> I think you are mixing up the counterweight and the bob-weight. The count=
erweight is indeed there to prevent flutter by mass balancing the control su=
rface. Removing the bob-weight will reduce the stick force/g. Lancair expe=
rimented with reducing or eliminating the bob-weight many years ago. I don'=
t recall the details however.
> Chris Zavatson
> N91CZ
> 360std
> http://www.n91cz.net/=20
>=20
>=20
> On Tuesday, March 18, 2014 10:33 AM, Chris Zavatson <chris_zavatson@yahoo.=
com> wrote:
> Jack,
> The bob-weight changes the slope of the stick force gradient. It is alrea=
dy very shallow. Removing the weight would make it even more so. =20
> What is the nature of the 'inconsistent' altitude hold, a long and slow me=
andering (likely a static source lag issue) or a short and quick movement (l=
ikely a gain or sensitivity issue).
>=20
> Chris Zavatson
> N91CZ
> 360std
> http://www.n91cz.com/
>=20
>=20
> On Tuesday, March 18, 2014 6:55 AM, Jack Dysart <jldysart1@gmail.com> wrot=
e:
> My Tru Trak autopilot altitude hold is inconsistent, and opinions are that=
the servo had difficulty working properly because of the mass of the bobwei=
ght on the elevator idler arm. One possibility is to remove the weight and e=
xpect more pitch sensitivity (lighter stick force) in turns. Has anyone fou=
nd 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 c=
ontrol tube with a smaller, roughly parallel, rod with bearing ends.
> =20
> Jack Dysart =20
>=20
>=20
>=20
>=20
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div>Thanks for the enlightenment, Chris an=
d others. I did assume the discussion was about a counterweight s=
ystem.</div><div><br></div><div>John<br><br>Sent from my iPad<div><br></div>=
</div><div><br>On Mar 18, 2014, at 12:14 PM, Chris Zavatson <<a href=3D"m=
ailto:chris_zavatson@yahoo.com">chris_zavatson@yahoo.com</a>> wrote:<br><=
br></div><blockquote type=3D"cite"><div><div style=3D"color:#000; background=
-color:#fff; font-family:times new roman, new york, times, serif;font-size:1=
4pt"><div><span>John,</span></div><div><span>I think you are mixing up the c=
ounterweight and the bob-weight. The counterweight is indeed there to p=
revent flutter by mass balancing the control surface. Removing the bob=
-weight will reduce the stick force/g. Lancair experimented with r=
educing or eliminating the bob-weight many years ago. I don't rec=
all the details however.</span></div><div><span>Chris Zavatson</span></div><=
div><span>N91CZ</span></div><div><span>360std</span></div><div><span><a href=
=3D"http://www.n91cz.net/">http://www.n91cz.net/</a> </span></div><div=
class=3D"yahoo_quoted" style=3D"display: block;"> <br> <br> <div style=3D"f=
ont-family: times new roman, new york, times, serif; font-size: 14pt;"> <div=
style=3D"font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Luci=
da Grande,
sans-serif; font-size: 12pt;"> <div dir=3D"ltr"> <font face=3D"Arial" size=3D=
"2"> On Tuesday, March 18, 2014 10:33 AM, Chris Zavatson <<a href=3D"mail=
to:chris_zavatson@yahoo.com">chris_zavatson@yahoo.com</a>> wrote:<br> </f=
ont> </div> <div class=3D"y_msg_container"><div id=3D"yiv9983422145"><div><=
div style=3D"color: rgb(0, 0, 0); font-family: times new roman, new york, ti=
mes, serif; font-size: 14pt; background-color: rgb(255, 255, 255);"><div><sp=
an>Jack,</span></div><div><span>The bob-weight changes the slope of the stic=
k force gradient. It is already very shallow. Removing the weigh=
t would make it even more so. </span></div><div><span>What is the=
nature of the 'inconsistent' altitude hold, a long and slow meandering=
(likely a static source lag issue) or a short and quick movement (like=
ly a gain or sensitivity issue).</span></div><div><span><br clear=3D"none"><=
/span></div><div><span>Chris
Zavatson</span></div><div><span>N91CZ</span></div><div><span>360std</span><=
/div><div><span><a href=3D"http://www.n91cz.com/" target=3D"_blank" rel=3D"n=
ofollow" shape=3D"rect">http://www.n91cz.com/</a></span></div><div class=3D"=
yiv9983422145yqt6019055870" id=3D"yiv9983422145yqt15210"><div class=3D"yiv99=
83422145yahoo_quoted" style=3D"display: block;"> <br clear=3D"none"> <br cle=
ar=3D"none"> <div style=3D"font-family: times new roman, new york, times, se=
rif; font-size: 14pt;"> <div style=3D"font-family: HelveticaNeue, Helvetica N=
eue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div di=
r=3D"ltr"> <font face=3D"Arial" size=3D"2"> On Tuesday, March 18, 2014 6:55 A=
M, Jack Dysart <<a href=3D"mailto:jldysart1@gmail.com">jldysart1@gmail.co=
m</a>> wrote:<br clear=3D"none"> </font> </div> <div class=3D"yiv9983422=
145y_msg_container"><div id=3D"yiv9983422145"><style>#yiv9983422145 #yiv9983=
422145 --
=20
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#yiv9983422145 </style><div><div class=3D"yiv9983422145WordSection1"><div cl=
ass=3D"yiv9983422145MsoNormal">My Tru Trak autopilot altitude hold is incons=
istent, and opinions are that the servo had difficulty working properly beca=
use 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 sti=
ck force) in turns. Has anyone found other alternatives?</div><div cla=
ss=3D"yiv9983422145MsoNormal">What if the mass of the bobweight is reduced?<=
/div><div class=3D"yiv9983422145MsoNormal"> </div><div class=3D"yiv998=
3422145MsoNormal">My servo is behind the seat and connected to a ring clamp o=
n the elevator control tube with a smaller, roughly parallel, rod with beari=
ng ends.</div><div class=3D"yiv9983422145MsoNormal"> </div><div class=3D=
"yiv9983422145MsoNormal">Jack Dysart </div></div></div></d=
iv><br clear=3D"none"><br clear=3D"none"></div> </div> </div>=20
</div></div> </div></div></div><br><br></div> </div> </div> </div> </div>=
</div></blockquote></body></html>=
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