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<DIV><FONT face=Arial>Been there done that scratching the head wondering if it's
me, the wind, or the plane thing! :-) </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>With all the variables it's really hard to tell,
especially when you consider that the wind at altitude often isn't the same as
the wind on the ground. In addition to the unintentional mixing of controls
there's also the incredibly critical, and deceptive, wings level issue. If
you're wings aren't level on your pulls it will make the plane look like it's
veering off to one side when it's really going straight (from it's vantage
point). To the unseasoned eye it's very easy to *think* the wings are level when
they're not, especially on downlines at the end of the box.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Last year I wasn't sure if my plane was unreasonably
pulling to one side on uplines until I finally had Art Wagner fly it. He flew it
through the F05 sequence and was favorably impressed. He
said he thought it flew nice and straight, so I stopped worrying about
the plane and started focusing on my flying.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Keith</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=jed241@msn.com href="mailto:jed241@msn.com">Larry N Lisa</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, April 07, 2004 2:18
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Trimming Help</DIV>
<DIV><BR></DIV>
<DIV>
<DIV>
<DIV>I'm a newbie also and won't advise on what to do about trimming for this
problem. But my experience with trimming issues was fairly
humbling.</DIV></DIV>
<DIV> </DIV>
<DIV>After struggling for many weeks with suggestions about trimming on my
plane, I did finally go to a contest and asked a seasoned pilot to check it
out. After putting it through a few masters maneuvers that looked impressive
to me, he landed and said it just needed a couple of clicks on the
aileron.</DIV>
<DIV> </DIV>
<DIV>After a full season in Sportsman, I look back and reflected that most of
the problems were not trimming of the plane. I was coupling control inputs
every-time I moved a stick. Looked like I was having trimming problems, and it
was repeatable. I could actually screw it up the same way every time.</DIV>
<DIV> </DIV>
<DIV>I focused on stick movement at every contest and replaced the factory
springs with some stiffer springs from one of the Chicago folks, Bobby
Satalino. Jim Hubbard did the surgery replacing the springs after the contest
and I have been flying much better since.</DIV>
<DIV> </DIV>
<DIV>Every contest I went to had great folks very willing to help out. Allot
of advise on flying maneuvers that allowed me to see improvements at each
contest I entered.</DIV>
<DIV> </DIV>
<DIV>My only recommendation is to follow the advise of others in this
thread and get a seasoned pilot to help out.</DIV>
<DIV> </DIV>
<DIV>Good Luck...</DIV>
<DIV> </DIV>
<DIV>Larry Diamond</DIV>
<DIV>NSRCA 3083</DIV>
<DIV>AMA 5024</DIV>
<DIV> </DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial"><B>From:</B> <A
href="mailto:rcaerobob@cox.net">Bob Pastorello</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, March 30, 2004 7:57
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Trimming Help</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Courtesy of Buddy, I've placed (with his
permission) his summary of the "trimming" issues. Probably many of you
share my view that his summary was one of the most on-target, concise
statements I've read about trimming in a VERY long time, if ever!!!
Posted here for your reference:</FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="http://www.rcaerobats.net/trim_chart.htm">http://www.rcaerobats.net/trim_chart.htm</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks, Buddy!</FONT></DIV>
<DIV><BR>Bob Pastorello, Oklahoma<BR>NSRCA 199, AMA 46373<BR><A
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A><BR><A
href="http://www.rcaerobats.net">www.rcaerobats.net</A></DIV>
<DIV> </DIV>
<DIV> </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 href="mailto:BUDDYonRC@aol.com">BUDDYonRC@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, March 30, 2004 1:08
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Trimming Help</DIV>
<DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 face=Arial
color=#8000ff size=2 PTSIZE="9" FAMILY="SANSSERIF">Paul<BR>I am no
aerodynamics expert, but I have learned some basic's over the years that
work for me.<BR>1. The wing must have a positive angle of attack to create
lift.<BR>2. the stabilizer and elevators steer the pitch attitude of the
airplane resulting in more or less lift.<BR>3. Balance can change the
angle of attack which will change the pitch attitude.<BR>4. Aileron's up
or down will change the pitch attitude .<BR>5. Up or down thrust will
change the pitch attitude.<BR>Therefore:<BR>A. Increasing the positive
wing incidence will cause the airplane to climb, which will require down
trim to achieve level flight.<BR>B. Likewise adding tail weight will cause
the airplane to climb and require down trim to achieve level flight.<BR>C.
Added weight does not alter the vertical down line BUT elevator trim added
to maintain level flight because of the added weight will effect the down
line. Tail weight will require down trim which will steer the airplane
more to the belly in a down line, and added nose weight will require up
trim which will steer the airplane to the canopy.<BR>D. In the vertical up
line elevator trim and the engine thrust line will effect the vertical
and/or yaw direction <BR>All of the above will effect the
knife edge flight of the model.<BR>Combinations of adjustments to any or
all of the above trim items done at the same time will leave you confused
and frustrated.<BR>Most models will require some mixing to achieve near
perfect lines in all flight attitudes in order to minimize / eliminate
control inputs by the pilot to maintain a perfect course.<BR>I have yet to
see the perfect airplane should such an animal exist, but I keep looking
and building since I truly believe that nothing is impossible.<BR>When
trimming an airplane make a written log of every change no matter how
small so you don't have to start over when changes are not
correct.<BR>Buddy</FONT>
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