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<DIV dir=ltr align=left><FONT face=Arial size=2><SPAN
class=609442819-16092005><SPAN class=753350120-16092005>Can't type...the first
link below should be...</SPAN></SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial size=2><SPAN
class=609442819-16092005><SPAN
class=753350120-16092005></SPAN></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial size=2><SPAN
class=609442819-16092005><A
href="http://users.ev1.net/~rwlewis/rcpictures/express/express with nat.jpg">http://users.ev1.net/~rwlewis/rcpictures/ex<SPAN
class=753350120-16092005>p</SPAN>ress/express with
nat.jpg</A></SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#000000 size=2><SPAN
class=609442819-16092005></SPAN></FONT> </DIV></FONT></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org] <B>On Behalf Of </B>Lewis,
Richard<BR><B>Sent:</B> Friday, September 16, 2005 3:00 PM<BR><B>To:</B>
discussion@nsrca.org<BR><B>Subject:</B> RE: roll coupling <BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=609442819-16092005>It's not ALL about the dihedral. Many other
variables like wing sweep, rudder area distribution, vertical CG, fore-aft CG,
fuselage side area distribution, etc...effect roll coupling with rudder.
Most of these are inhernet to the design and construction of the airframe, thus
are difficult to change. Although form tends to follow function (hence
many similar looking pattern designs) most designers and pilots still want an
airplane that bears some resemblance to a "real" airplane (canopy, stab
locations/shape, wing planform, etc...) and thus most designs are less than
ideal from a neutrality and coupling standpoint. Not to say you
can't tweak an conventionally shaped airframe to be totally neutral and
have no coupling, it just requires some trial and error and luck to get the
magic formula.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=609442819-16092005></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=609442819-16092005>Richard</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=609442819-16092005>(Oh MY...I'm starting to sound like Nat) see
links below....</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=609442819-16092005></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=609442819-16092005><A
href="http://users.ev1.net/~rwlewis/rcpictures/epxress/express with nat.jpg">http://users.ev1.net/~rwlewis/rcpictures/epxress/express
with nat.jpg</A></SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#000000 size=2><SPAN
class=609442819-16092005></SPAN></FONT> </DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><SPAN
class=609442819-16092005><FONT face=Arial color=#0000ff size=2><A
href="http://users.ev1.net/~rwlewis/rcpictures/express/express maiden 03.jpg">http://users.ev1.net/~rwlewis/rcpictures/express/express
maiden 03.jpg</A> </FONT></SPAN></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><SPAN
class=609442819-16092005></SPAN> </DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
</DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT face=Tahoma
size=2><B>From:</B> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org] <B>On Behalf Of </B>Atwood,
Mark<BR><B>Sent:</B> Friday, September 16, 2005 12:54 PM<BR><B>To:</B>
patternrules@earthlink.net; discussion<BR><B>Subject:</B> RE: roll coupling
<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Dihedral. It’s
ALL about the dihedral… To much and you get pro-verse coupling, too little
and you’ll get adverse coupling. <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Ever flown the old
“Contender” kit?? Zero dihedral in the wing…push hard right rudder and
make a nicely banked left turn….lol<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">-Mark<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<DIV>
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face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
discussion-request@nsrca.org [mailto:discussion-request@nsrca.org] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Steven Maxwell<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Friday, September 16, 2005 12:53
PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> discussion<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> roll coupling
</SPAN></FONT><o:p></o:p></P></DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face="MS Sans Serif" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'MS Sans Serif'"> I was doing some
changes to my plane the other day moved CG back a little tested with a little
more incedence, and no matter what I done it requires aileron mix with rudder. I
haven't found anything that explains what needs to be changed to fix this, the
mix is 12% and 15%.<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="MS Sans Serif" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'MS Sans Serif'"> Any thoughts out
there?<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="MS Sans Serif" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'MS Sans Serif'"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="MS Sans Serif" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'MS Sans Serif'"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="MS Sans Serif" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'MS Sans Serif'">Steven
Maxwell<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="MS Sans Serif" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'MS Sans Serif'"> <o:p></o:p></SPAN></FONT></P></DIV></DIV></BODY></HTML>