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I can't really recall. But, it seems to me that it's a very fine line
between a slight pre-load, and actually putting enough pressure on the
servo to try to continually pull it off center. It would require some
experimentation. And, getting it right in a static condition wouldn't
necessarily mean it was correct under air loads. But, bottom line, for
these folks it seemed to work.<br>
Bill Glaze<br>
<br>
Brian Young wrote:<br>
<blockquote type="cite"
cite="mid20040216221907.98607.qmail@web13421.mail.yahoo.com">
<pre wrap="">What do they do put this on the opposite side of the
surface as the control horn?
--- Bill Glaze <a class="moz-txt-link-rfc2396E" href="mailto:billglaze@triad.rr.com"><billglaze@triad.rr.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">To prevent this very thing, and to forestall any
flutter, I have heard
of some folks who actually pre-load the surfaces
with a rubber band, and
then are able to completely neutralize the surface,
while preventing
flutter. Kind of like a snubber, which is used with
great success in
the Boeing 727 and 757/67, with which I have some
experience. Although
Boeing does not use a rubber band, (not even a very
large, strong one)
to my knowledge! :-D
Bill Glaze
george kennie wrote:
</pre>
<blockquote type="cite">
<pre wrap="">I agree!
"Karl G. Mueller" wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Georgie, One thing you don't want is a
</pre>
</blockquote>
</blockquote>
<pre wrap="">"completely neutral" set up.
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">Itwill be very hard on the servo gears,
</pre>
</blockquote>
</blockquote>
<pre wrap="">especially when it is
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">tooneutral in pitch.My last years Star had an
</pre>
</blockquote>
</blockquote>
<pre wrap="">almost neutral set up
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">in pitchand it started stripping the gears in the
</pre>
</blockquote>
</blockquote>
<pre wrap="">elevator servos.It
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">took me a little while to arrive at this
</pre>
</blockquote>
</blockquote>
<pre wrap="">conclusion since therewasn't
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">too much left of the plane when this happened the
</pre>
</blockquote>
</blockquote>
<pre wrap="">secondtime. My
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">suspicions were confirmed after talking to some
"AerodynamicsExperts". Every moveable surface
</pre>
</blockquote>
</blockquote>
<pre wrap="">wants to hunt for a
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">neutral positionand if there is no opposite force
</pre>
</blockquote>
</blockquote>
<pre wrap="">( Trim ) to stop it
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">from doing thisyou will get a certain amount of
</pre>
</blockquote>
</blockquote>
<pre wrap="">oscillation ( flutter
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">). Having a minuteamount of trim offset puts a
</pre>
</blockquote>
</blockquote>
<pre wrap="">slight force from the
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">airflow over it in onedirection and will put a
</pre>
</blockquote>
</blockquote>
<pre wrap="">stop to any
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">oscillation. "Completely Neutral"is not the ideal
</pre>
</blockquote>
</blockquote>
<pre wrap="">condition. Karl G.
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">Mueller
<a class="moz-txt-link-abbreviated" href="mailto:kgamueller@rogers.com">kgamueller@rogers.com</a>
</pre>
</blockquote>
</blockquote>
<pre wrap=""><a class="moz-txt-link-rfc2396E" href="mailto:kgamueller@rogers.com"><mailto:kgamueller@rogers.com></a>
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> ----- Original Message -----
From: george kennie <a class="moz-txt-link-rfc2396E" href="mailto:geobet@gis.net"><mailto:geobet@gis.net></a>
To: <a class="moz-txt-link-abbreviated" href="mailto:discussion@nsrca.org">discussion@nsrca.org</a>
</pre>
</blockquote>
</blockquote>
<pre wrap=""><a class="moz-txt-link-rfc2396E" href="mailto:discussion@nsrca.org"><mailto:discussion@nsrca.org></a>
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> Sent: Friday, February 13, 2004 12:50 PM
Subject: Re: Trim
"Completely Neutral" is the most complex
</pre>
</blockquote>
</blockquote>
<pre wrap="">descriptive condition
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> that one can conceptualize. There are so many
</pre>
</blockquote>
</blockquote>
<pre wrap="">variables, that
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> there is only one specific set that will
</pre>
</blockquote>
</blockquote>
<pre wrap="">approximate the required
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> parameters to achieve the "voila"
</pre>
</blockquote>
</blockquote>
<pre wrap="">condition.Change one thing and
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> you no longer have "completely neutral".
Not trying to be corrective here, just
</pre>
</blockquote>
</blockquote>
<pre wrap="">stating that in my
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> experience completely neutral is more than
</pre>
</blockquote>
</blockquote>
<pre wrap="">elusive, but somewhat
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> attainable under certain conditions.
What I'm currently searching for is the
</pre>
</blockquote>
</blockquote>
<pre wrap="">correct force arrangement
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> that will give me a neutral airplane at the
</pre>
</blockquote>
</blockquote>
<pre wrap="">C.G. that I like to
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> fly at. I would like to fly an airplane that
</pre>
</blockquote>
</blockquote>
<pre wrap="">adapts to me not the
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> other way around. Elusive? Yeah! But
</pre>
</blockquote>
</blockquote>
<pre wrap="">attainable? At this point, I
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> think maybe!
Georgie
<a class="moz-txt-link-abbreviated" href="mailto:Patternrules@aol.com">Patternrules@aol.com</a> wrote:
</pre>
<blockquote type="cite">
<pre wrap=""> In a message dated 2/12/2004 11:26:21 AM US
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">Eastern Standard
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> Time, <a class="moz-txt-link-abbreviated" href="mailto:natpenton@centurytel.net">natpenton@centurytel.net</a> writes:
For an airplane that goes to the canopy
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">in knife-edge most
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> trim charts say , after adjusting cg ,
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">to increase the wing
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> incidence . My " theory " says to
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">decrease the wing
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> incidence. What is your
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">theory/experience ?
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> What does the plane do in the down lines,
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">if they are good you
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> could just mix in a little down elevator
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">with rudder, for the
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> knife edge. Nat, I would have thought that
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">a guy that designed
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> the Voo Doo Express that was completely
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">neutral, would have all
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap=""> the answers LOL. Steve Maxwell
</pre>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<pre wrap=""><!---->
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