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<DIV><FONT face=Arial size=2>Aren't you going to tell us which direction does
what? </FONT></DIV>
<DIV><FONT face=Arial size=2> </FONT></DIV>
<DIV><FONT face=Arial size=2>wing higher = ? pitching moment with
yaw</FONT></DIV>
<DIV><FONT face=Arial size=2>more dorsal = ditto</FONT></DIV>
<DIV><FONT face=Arial size=2>more sub dorsal =ditto</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Jim O</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></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=natpenton@centurytel.net href="mailto:natpenton@centurytel.net">Nat
Penton</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, December 20, 2005 5:06
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [NSRCA-discussion] Fw:
Trim</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Things are getting a little slow so I decided to
forward this to the list.</FONT></DIV>
<DIV> </DIV>
<DIV style="FONT: 10pt arial">----- Original Message -----
<DIV style="BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A
title=natpenton@centurytel.net href="mailto:natpenton@centurytel.net">Nat
Penton</A> </DIV>
<DIV><B>To:</B> <A title=DaveL322@comcast.net
href="mailto:DaveL322@comcast.net">David Lockhart</A> ; <A
title=pappasfamily@pappasfamily.net
href="mailto:pappasfamily@pappasfamily.net">Dean Pappas</A> </DIV>
<DIV><B>Sent:</B> Thursday, November 24, 2005 12:22 AM</DIV>
<DIV><B>Subject:</B> Trim</DIV></DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>No one seems to understand the following. It is
not taught in Aero school and I have never seen it in print. Some of our trim
charts even have wing incidence re KE backwards.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The simple key to understanding the aerobatic
airplane is recognizing the fuselage has a nose down pitching moment when
<U>yawed</U>. This is why all pattern planes evolved to look
alike.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>This is the force that balances, in KE, the up
elevator trim needed to fly straight and level. The force is present though
in all attitudes when yawed.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The magnitude of the moment is determined by the
wing relationship to the fuselage. The moment can also be changed by
changing the fuselage shape i.e. adding a dorsal or
sub-dorsal.</FONT></DIV>
<DIV><FONT face=Arial
size=2>
Nat</FONT></DIV>
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