<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
<title></title>
</head>
<body text="#000000" bgcolor="#ffffff">
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!<span class="moz-smiley-s5"><span>
:-D </span></span><br>
<br>
Bill Glaze<br>
<br>
george kennie wrote:<br>
<blockquote type="cite" cite="mid4031060F.A512B465@gis.net">I agree!
<p>"Karl G. Mueller" wrote:
</p>
<blockquote type="CITE">
<style></style>Georgie, One thing you don't
want is a "completely neutral" set up. Itwill be very hard on the servo
gears, especially when it is tooneutral in pitch.My last years Star had
an almost neutral set up in pitchand it started stripping the gears in
the elevator servos.It took me a little while to arrive at this
conclusion
since therewasn't too much left of the plane when this happened the
secondtime.
My suspicions were confirmed after talking to some
"AerodynamicsExperts".
Every moveable surface wants to hunt for a neutral positionand if there
is no opposite force ( Trim ) to stop it from doing thisyou will get a
certain amount of oscillation ( flutter ). Having a minuteamount of
trim
offset puts a slight force from the airflow over it in onedirection and
will put a stop to any oscillation. "Completely Neutral"is not the
ideal
condition. Karl G. Mueller
<br>
<a href="mailto:kgamueller@rogers.com">kgamueller@rogers.com</a>
<blockquote dir="ltr"
style="border-left: 2px solid rgb(0, 0, 0); padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;">
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-stretch: normal; font-size-adjust: none;">-----
Original Message -----</div>
<div
style="background: rgb(228, 228, 228) none repeat scroll 0%; -moz-background-clip: initial; -moz-background-inline-policy: initial; -moz-background-origin: initial; font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-stretch: normal; font-size-adjust: none;"><b>From:</b>
<a href="mailto:geobet@gis.net" title="geobet@gis.net">george
kennie</a></div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-stretch: normal; font-size-adjust: none;"><b>To:</b>
<a href="mailto:discussion@nsrca.org" title="discussion@nsrca.org">discussion@nsrca.org</a></div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-stretch: normal; font-size-adjust: none;"><b>Sent:</b>
Friday, February 13, 2004 12:50
PM</div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-stretch: normal; font-size-adjust: none;"><b>Subject:</b>
Re: Trim</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><a class="moz-txt-link-abbreviated" href="mailto:Patternrules@aol.com">Patternrules@aol.com</a> wrote:
</p>
<blockquote type="CITE"> In a message dated 2/12/2004 11:26:21 AM
US Eastern Standard Time, <a class="moz-txt-link-abbreviated" href="mailto:natpenton@centurytel.net">natpenton@centurytel.net</a> writes:
<blockquote
style="border-left: 2px solid blue; padding-left: 5px; margin-left: 5px;"><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.
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>
</blockquote>
</blockquote>
</body>
</html>