<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2800.1498" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Symetrical airfoil wing design needs some AOA to
create lift though...no?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I'll buy a dozen of those perfect planes if they
are out there!</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=mrandmrst@comcast.net href="mailto:mrandmrst@comcast.net">Ken
Thompson</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, September 11, 2005 3:35
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Incidence or CG?</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>You shouldn't need an aft CG to create lift, the
wing design will do that for you. If your "assumption plane" flies
level, both upright and inverted, with no elevator input, I call that the
"perfect" CG.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>At least that is my opinion.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ken</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=super7@adelphia.net href="mailto:super7@adelphia.net">Thomas P.
Fiorentino</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, September 11, 2005 8:51
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Incidence or CG?</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>OK thats helpful Ken. I have a pattern
ARF that I am tinkering with and having some fun. The downlines are
really nice, but I hold too much down on inverted flight. I'll move
the CG aft a little and see where that takes me.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Here is my follow-up question because I can't
help myself. Lets assume you have a plane with wing and stab at 0
degrees. Lets assume further that you have no elevator trim and
the engine has no thrust adjustments. If this assumption airplane
actually flew level...would an aft CG be responsible for creating the right
AOA on the wing to create lift? Am I understanding this
correctly?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks for your input!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Tom</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=mrandmrst@comcast.net href="mailto:mrandmrst@comcast.net">Ken
Thompson</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, September 11, 2005 6:38
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Incidence or CG?</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>If you had a little positive incidence in the
main wing, to fly level in upright flight, you would have it corrected by
incidence in the stab or possibly elevator trim. When you roll
inverted the correction remains constant.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ken</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=super7@adelphia.net href="mailto:super7@adelphia.net">Thomas P.
Fiorentino</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, September 11, 2005
12:29 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Incidence or CG?</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Bear with me on this question
guys...</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I know the test for CG is to roll inverted
and watch for nose down or tail down. But relative to everything
else why wouldn't wing incidence screw you up inverted? Seems to
me that all things remaining equal, if you had a little positive wing
incidence and level flight upright that the nose would drop when
inverted....Where is the blind spot in my logic?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Tom
Fiorentino</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>