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<DIV><SPAN class=921461621-08122005><FONT face=Arial color=#0000ff size=2>Hi
Paul, </FONT></SPAN></DIV>
<DIV><SPAN class=921461621-08122005><FONT face=Arial color=#0000ff size=2>It's
the wing area weighted average of the 25% (or whatever) MAC of each
wing.</FONT></SPAN></DIV>
<DIV><SPAN class=921461621-08122005><FONT face=Arial color=#0000ff size=2>If the
areas are equal, it is centered between the 25% MAC of the bottom and the
25% MAC of the top. </FONT></SPAN></DIV>
<DIV><SPAN class=921461621-08122005><FONT face=Arial color=#0000ff size=2>If the
top wing has, say, double the area of the bottom wing, then it's 2/3 of the way
from the 25% MAC of the bottom to the 25% MAC of the top.</FONT></SPAN></DIV>
<DIV><SPAN class=921461621-08122005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=921461621-08122005><FONT face=Arial color=#0000ff size=2>While
I am here: did the throw reduction fix your sensitivity
problem?</FONT></SPAN></DIV>
<DIV><SPAN class=921461621-08122005><FONT face=Arial color=#0000ff size=2>One
other variable is hingeline shape. If the leading edges of the the ailerons
protrude above the wing surface this can cause all sorts of
issues.</FONT></SPAN></DIV>
<DIV><SPAN class=921461621-08122005><FONT face=Arial color=#0000ff size=2>It
wasn't likely, so I didn't bother to chime in, before.</FONT></SPAN></DIV>
<DIV><SPAN class=921461621-08122005><FONT face=Arial color=#0000ff
size=2>later,</FONT></SPAN></DIV>
<DIV><SPAN class=921461621-08122005><FONT face=Arial color=#0000ff
size=2>Dean</FONT></SPAN></DIV>
<DIV><SPAN class=921461621-08122005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<P><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT
face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT
face="Times New Roman">Kodeos Communications</FONT> <BR><FONT
face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT
face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT
face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT
face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT
face="Times New Roman">d.pappas@kodeos.com</FONT> </P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org]<B>On Behalf Of </B>paul<BR><B>Sent:</B>
Thursday, December 08, 2005 4:00 PM<BR><B>To:</B>
discussion@nsrca.org<BR><B>Subject:</B> CG for Biplane<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2> Anyone know how the calculate
the CG for a Biplane ? I expect it is 25-30% of the MAC; but, how do I
calculate the MAC for a biplane ?</FONT></DIV>
<DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV><FONT face=Arial size=2>Paul</FONT></DIV></BLOCKQUOTE></BODY></HTML>