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<DIV><FONT face=Arial size=2>Dan,</FONT></DIV>
<DIV><FONT face=Arial size=2>Interesting posts on this today. I have a
suggestion at the opposite end of theplane from Troy's post. You may have
too much downthrust. The elevator trim to compensate for this is one of
the reasons planes have pull to the canopy. There are others, like the
profile of the fuse when it is the lifting surface in KE, but let's put that
aside because if it is the fuse shape, you may need some Nat Penton ventral fins
and he's the best to describe them.</FONT></DIV>
<DIV><FONT face=Arial size=2> Anyways, at 45 degrees (as in the 4/8
example) you are flying with an odd combination of partial wing lift, partial
fuse lift and these may upset the balance of the downthrust and elevator
trim. </FONT></DIV>
<DIV><FONT face=Arial size=2> I didn't catch the plane you were flying or
how it is setup. but there are some kits out there now that fly with lots
of downthrust, positive incidence in the wing and negative in the stab. A
real complex combination of speed dependent and attitude dependent
forces.</FONT></DIV>
<DIV><FONT face=Arial size=2>--Lance</FONT></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 title=warrior523@mchsi.com href="mailto:warrior523@mchsi.com">Dan
Curtis</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">NSRCA Discussion</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, April 18, 2004 12:57
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Trim Question</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2>Well I have run into a trim problem with a plane that I have
not seen before. Time to tap into the wealth of knowledge on the
list.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>The plane generally is flying pretty nice.
Uplines/Downlines are good, minor mixing for knifeedge stuff, good feel while
inverted...etc.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Problem rears its ugly head in rolling to knifeedge.
When using small aileron movement to slowly roll into a 4/8 or 4 pt for
example the plane will pitch to canopy. Not drastically but I would say
moderately, more than enough to cause a concern. However, if you do a
full 4 pt or slow roll with rudder coming in the pitch to canopy does not
happen. With good top rudder the plane is trimmed to fly very nice
straight knifeedge flight right or left.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I got to playing with is some today and when I would roll
from upright to knife edge with no other input other than the aileron
deflection the plane would have a predictable drop of the nose and would begin
going to the canopy.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>What am I overlooking here. Any ideas or has anyone
run into this before?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Thanks</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Dan Curtis</FONT></DIV></BLOCKQUOTE></BODY></HTML>