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<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'>If I’m following this correctly,
putting the servo on its side so that servo arm and control horn move in the
same plane makes this simpler.<span style='mso-spacerun:yes'> </span>As
the servo arm rotates and becomes shorter and less effective the control horn
becomes shorter and more effective.<span style='mso-spacerun:yes'>
</span>If they were the same length to begin with, the effects should cancel
each other and we get linear movement.<span style='mso-spacerun:yes'>
</span>Right?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<div>
<p><font size=2 color=blue face="Times New Roman"><span style='font-size:10.0pt;
color:blue;mso-no-proof:yes'>Steve Byrum </span></font><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> </span></font><st1:PersonName><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>discussion-request@nsrca.org</span></font></st1:PersonName><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> [mailto:</span></font><st1:PersonName><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>discussion-request@nsrca.org</span></font></st1:PersonName><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Jon Lowe<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, February 10, 2005
10:18 AM<br>
<b><span style='font-weight:bold'>To:</span></b> </span></font><st1:PersonName><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>discussion@nsrca.org</span></font></st1:PersonName><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: Notes to Self 3</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>What he is saying is this: As
the servo arm rotates from 90 degrees, the effective length of the servo arm
gets shorter, meaning that for each incremental degree of rotation of the
servo arm from 90 degrees, you get less incremental movement of the
pushrod. Therefore the control is inherently more sensitive around
neutral than it is at the ends of the servo throw, assuming linearity in the
rest of the system. Expo can be used to counter this natural tendency.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>HOWEVER, the effective length of the
surface control horn also gets shorter as the surface moves from neutral,
increasing movement with each incremental movement of the
pushrod. So it is a race between decreasing effectiveness of
the servo output arm vs. increasing effectiveness of the control horn.
Then you get into non-linearity of the aerodynamic surface effectiveness itself
as it moves from neutral, and you can get confused real quick. You are
dealing with several areas of non-linearity, and trying to compromise between
them all.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Jon Lowe</span></font> <o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Tim Taylor<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, February 10, 2005
8:28 AM<br>
<b><span style='font-weight:bold'>To:</span></b> discussion@nsrca.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [SPAM] Re: Notes to
Self 3</span></font><o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Troy let me get this straight in my
mind, You said</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>"The reason is the servo wheel
is round and its Y axis distance changes for each degree of travel as the servo
rotates around the back side."</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Now It took me a few readings and
some pondering to understand what you said. It doesn't matter what type arm you
use,correct so far? What I take this to mean is as the servo arm moves the
point at which the servo is connected to the driving rod and the center arm
screw is at it's farthest point at 90 degrees to the servo case (assuming the
servo case is 90 degrees to the hinge line) as it moves forward or backwards
the distance between the pivot points decreases with each degree of
rotation. Correct?</span></font><o:p></o:p></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='margin-left:.5in;background:#E4E4E4'><b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:troy_newman@msn.com" title="troy_newman@msn.com">Troy A. Newman</a>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:discussion@nsrca.org" title="discussion@nsrca.org">discussion@nsrca.org</a>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Friday,
February 11, 2005 11:05 PM<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> [SPAM] Re:
Notes to Self 3<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>8103, 9303 and 10X expo are the same
Positive is softer and Negative is harder feel. I'm writing an article for the
KF right now that talks about Expo and how to use it. When to use it. And the
effects of it. Sometimes a reverse expo (faster response) at center can be of
benefit. We have played with this in snaps and found that it has some
promise...Lots of regular expo on the ailerons and rudder and reverse expo on
the elevator...The result is the model will pitch harder on entry before the
rotations.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Another thing depending on the radio
it takes 20-30% expo just to get the output to be linear. The reason is the
servo wheel is round and its Y axis distance changes for each degree of travel
as the servo rotates around the back side.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>This is March KF stuff so I won't
elaborate here but I have some data to back up my words. </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Troy</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='margin-left:.5in;background:#E4E4E4'><b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:tncbrown@charter.net" title="tncbrown@charter.net">T&C Brown</a>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:discussion@nsrca.org" title="discussion@nsrca.org">discussion@nsrca.org</a>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Wednesday,
February 09, 2005 8:42 PM<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Re: Notes
to Self 3<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Times New Roman"><span
style='font-size:10.0pt'>That is odd Tim. I wonder why JR decided after
all these years to change from a pos. setting to a neg. for a "softer
feel". I'm a firm believer in "If it ain't broke, don't fix
it" </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Times New Roman"><span
style='font-size:10.0pt'>I made the same mistake a few years back when I
switched from a Futaba 7UAP to a JR 8103 and inadvertently put neg. expo in the
8103. Talk about pucker factor for a few minutes. </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Times New Roman"><span
style='font-size:10.0pt'>Maybe Fu-tuh-boo-boo is rubbing off on JR!
(BG)</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Times New Roman"><span
style='font-size:10.0pt'>T-Bone</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='margin-left:.5in;background:#E4E4E4'><b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:twtaylor@ftc-i.net" title="twtaylor@ftc-i.net">Tim Taylor</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:discussion@nsrca.org" title="discussion@nsrca.org">discussion@nsrca.org</a>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Wednesday,
February 09, 2005 12:18 PM<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Re: Notes
to Self 3<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>That's the whole point in the story
Ron, I ASSUMED I was right and didn't NEED to RTFB and could have screwed up
big time. I've been flying JR radios for years but always a PCM10 of some sort,
this 9303 is a new radio for me. What I did was get in a hurry, I wanted
to fly and trim this airplane and didn't do what I should have done first. I
hope my not so comical errors will help someone else from making the same
mistake I did.</span></font><o:p></o:p></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='margin-left:.5in;background:#E4E4E4'><b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:vanputte@cox.net" title="vanputte@cox.net">Ron Van Putte</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:discussion@nsrca.org" title="discussion@nsrca.org">discussion@nsrca.org</a>
<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Wednesday,
February 09, 2005 12:01 PM<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Re: Notes
to Self 3<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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On Feb 9, 2005, at 8:28 AM, Tim Taylor wrote:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><?fontfamily><?param Arial><?smaller>As our Continuing
story unfolds........<br>
<?/smaller><?/fontfamily> <br>
<?fontfamily><?param Arial><?smaller>Timmy T is looking out of the shop door
and sees that the weather is just perfect for some trim flights<br>
<?/smaller><?/fontfamily> <br>
<?fontfamily><?param Arial><?smaller>So we pack up the trailer and go for some
trim flights. Recalling the last flights all control throws too sensitive
so I dial in less rates on low and put high rates to what low was before.
Ok time to dial in some Expo on all surfaces, pop up the screen on the 9303 and
dial in 30%. Ok time to fly. Airplane seems pretty stable now but the controls
feel a bit "Twitchy" hmmm no problem continue the flight land and
have a look. Ok maybe I didn't get enough expo dialed in so add some more. Next
flight about the same but the controls seem a bit more "twicthy" hmmm
something's not right here. Ok times up for flying for today pack up and head
home. On the way home I get to thinking about the last flight and how the
airplane changed the "feel" after I added the expo. Ok I get to
wondering where the heck did I put the book for this new radio, Ok lets review
the book on page A20 is the expo directions, it states "NOTE: Use only
positive percentages unless there is a distinct need to do otherwise".
Hmmmmmm that don't sound right! Turn the transmitter on and look at the expo
I've got dialed into the radio, *&%^$*&#)(#&%^%)@(_*&_(^#
Everything is done to the NEGATIVE !!!!!! No damn wonder! So "Note to
self" today's lesson is READ THE FRIGGIN BOOK !!!!!!!!!<br>
<?/smaller><?/fontfamily> <br>
<?fontfamily><?param Arial><?smaller>Ok while I'm at it lets program a little
down elevator trim at low idle, I wonder what page that is on in the
book.................. "Fade to Black as Timmy T reaches for the book."<o:p></o:p></span></font></p>
<?/smaller><?/fontfamily>
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style='font-size:12.0pt'><br>
My guess is that he's using a JR radio, because negative exponential is what
you want on a Futaba transmitter to soften the control response. That's why
well-meaning people at the field need to find out what brand of transmitter the
guy being counseled has before telling him how to change the expo. <br>
<br>
I had a similar situation when I was helping a novice trim out his airplane.
After I flew a trim flight for him, I told him he needed 50 - 60% exponential
on elevator and aileron. I asked him if he knew how to do that and he said that
he did. The airplane was a handful on the subsequent flight, because he put in
the wrong expo!<br>
<br>
Ron Van Putte<o:p></o:p></span></font></p>
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