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<DIV>Georgie,</DIV>
<DIV> </DIV>
<DIV>One thing you don't want is a "completely neutral" set up. It</DIV>
<DIV>will be very hard on the servo gears, especially when it is too</DIV>
<DIV>neutral in pitch.</DIV>
<DIV>My last years Star had an almost neutral set up in pitch</DIV>
<DIV>and it started stripping the gears in the elevator servos.</DIV>
<DIV>It took me a little while to arrive at this conclusion since there</DIV>
<DIV>wasn't too much left of the plane when this happened the second </DIV>
<DIV>time. My suspicions were confirmed after talking to some
"Aerodynamics</DIV>
<DIV>Experts". Every moveable surface wants to hunt for a neutral position</DIV>
<DIV>and if there is no opposite force ( Trim ) to stop it from doing
this</DIV>
<DIV>you will get a certain amount of oscillation ( flutter ). Having a
minute</DIV>
<DIV>amount of trim offset puts a slight force from the airflow over it in one
</DIV>
<DIV>direction and will put a stop to any oscillation. "Completely
Neutral"</DIV>
<DIV>is not the ideal condition.</DIV>
<DIV> </DIV>
<DIV>Karl G. Mueller<BR><A
href="mailto:kgamueller@rogers.com">kgamueller@rogers.com</A><BR></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=geobet@gis.net href="mailto:geobet@gis.net">george kennie</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> Friday, February 13, 2004 12:50
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Trim</DIV>
<DIV><BR></DIV>"Completely Neutral" is the most complex descriptive condition
that one can conceptualize. There are so many variables, that there is only
one specific set that will approximate the required parameters to achieve the
"voila" condition.Change one thing and you no longer have "completely
neutral". <BR>Not trying to be corrective here, just stating that in my
experience completely neutral is more than elusive, but somewhat attainable
under certain conditions. <BR>What I'm currently searching for is the correct
force arrangement that will give me a neutral airplane at the C.G. that I like
to fly at. I would like to fly an airplane that adapts to me not the other way
around. Elusive? Yeah! But attainable? At this point, I think maybe!
<BR>Georgie <BR> <BR>
<P>Patternrules@aol.com wrote:
<BLOCKQUOTE TYPE="CITE"> In a message dated 2/12/2004 11:26:21 AM US
Eastern Standard Time, natpenton@centurytel.net writes:
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
face=Arial><FONT size=-1>For an airplane that goes to the canopy in
knife-edge most trim charts say , after adjusting cg , to increase the
wing incidence . My " theory " says to decrease the wing incidence. What
is your theory/experience ?</FONT></FONT></BLOCKQUOTE><B> What does the
plane do in the down lines, if they are good you could just mix in a little
down elevator with rudder, for the knife edge.</B><B> Nat, I would
have thought that a guy that designed the Voo Doo Express that was
completely neutral, would have all the answers
LOL.</B> <B><I><FONT face="Arial Baltic"><FONT size=-1>Steve
Maxwell</FONT></FONT></I></B></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>