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<DIV><FONT face=Arial size=2>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.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>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.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>This is March KF stuff so I won't elaborate here
but I have some data to back up my words. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Troy</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE dir=ltr
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=tncbrown@charter.net href="mailto:tncbrown@charter.net">T&C
Brown</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, February 09, 2005 8:42
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Notes to Self 3</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2>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" </FONT></DIV>
<DIV><FONT size=2>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.</FONT><FONT
size=2> </FONT></DIV>
<DIV><FONT size=2>Maybe Fu-tuh-boo-boo is rubbing off on JR!
(BG)</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>T-Bone</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=twtaylor@ftc-i.net href="mailto:twtaylor@ftc-i.net">Tim Taylor</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, February 09, 2005
12:18 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Notes to Self 3</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>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.</FONT></DIV>
<BLOCKQUOTE
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=vanputte@cox.net href="mailto:vanputte@cox.net">Ron Van Putte</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, February 09, 2005
12:01 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Notes to Self 3</DIV>
<DIV><BR></DIV><BR>On Feb 9, 2005, at 8:28 AM, Tim Taylor wrote:<BR><BR>
<BLOCKQUOTE><?fontfamily><?param Arial><?smaller>As our Continuing story
unfolds........<?/smaller><?/fontfamily><BR> <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<?/smaller><?/fontfamily><BR> <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 !!!!!!!!!<?/smaller><?/fontfamily><BR> <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."<?/smaller><?/fontfamily><BR></BLOCKQUOTE><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<BR></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>