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<DIV><FONT face=Arial size=2>I have got a few interesting answers off line also
and will think about it some more. Thank you all.</FONT></DIV>
<DIV><FONT face=Arial size=2>You are partially right Del about the weight
lifting project. I start thinking about CG vs. weight issue before meeting
these students but that project got the idea back. I plan to do the first few
flights with a low weight but I would like to keep the plane behavior similar
once loaded.</FONT></DIV>
<DIV><FONT face=Arial size=2>I have no intention to add weight to my pattern
plane, don't worry :-)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Xavier</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=drykert@localnet.com href="mailto:drykert@localnet.com">Del K.
Rykert</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> Monday, March 29, 2004 9:20
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: CG location vs total
weight</DIV>
<DIV><BR></DIV>
<DIV><STRONG><FONT face="MS Sans Serif" color=#008080 size=2>Hi
Xavier..</FONT></STRONG></DIV>
<DIV><STRONG><FONT face="MS Sans Serif" color=#008080
size=2> Remember that elevator controls speed and throttle
controls elevation. The speed component is what need to be addressed to
keep the wing from stalling more so in the 2# heavier plane. Pitch
control is going to take much less elevator/drag input the more the CG is
moved back. If you truly want to make a pattern airplane 2# heavier than
it needs to be I guess I am missing the fundamentals of why we normally strive
so hard to keep our competition aircraft as light as possible. Speed is a
factor that has to be increased for a heavier aircraft to stay in the air
as wing loading is higher. C.G. I believe is primarily a factor within
realistic flight parameters that different pilots choose to fly at different
places to get the track and feel from their aircraft, not a component of
carrying more weight. </FONT></STRONG></DIV>
<DIV><STRONG><FONT face="MS Sans Serif" color=#008080
size=2> I suspect this is part of your weight lifting
project?</FONT></STRONG></DIV>
<DIV><STRONG><FONT face="MS Sans Serif" color=#008080
size=2></FONT></STRONG> </DIV>
<DIV><STRONG><FONT face="MS Sans Serif" color=#008080
size=2>
del
<BR>
NSRCA - 473</FONT></STRONG></DIV>
<DIV><STRONG><FONT face="MS Sans Serif" color=#008080
size=2></FONT></STRONG> </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=xavier.mouraux@sympatico.ca
href="mailto:xavier.mouraux@sympatico.ca">Xavier Mouraux</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> Monday, March 29, 2004 8:23
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> CG location vs total
weight</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Hello all,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I am trying to clarify an idea
about CG location for different weight of a same
airplane. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Goals:</FONT><FONT face=Arial
size=2> </FONT></DIV>
<DIV><FONT face=Arial size=2>Minimize the effect of elevator trim /stab
incidence on level flight, inverted flight and verticals.</FONT></DIV>
<DIV><FONT face=Arial size=2>The airplanes need to fly at the same speed
independent of its weight or the qty of fuel.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Questions:</FONT></DIV>
<DIV><FONT face=Arial size=2>Could it be that a heavier plane need a CG
more AFT than the same plane with a lower weight to "set" in the proper
angle of attack ?</FONT></DIV>
<DIV><FONT face=Arial size=2>Could it be useful to locate the tank so the CG
move FWD as the fuel is burned ?</FONT></DIV>
<DIV><FONT face=Arial size=2>What about CG recommendation on plan or from
other pilots with same plane but different weight ?</FONT></DIV>
<DIV><FONT face=Arial size=2>How much change in angle of attack is required
on a pattern plane for a 2lb difference in weight to fly at the same
speed ?</FONT></DIV>
<DIV><FONT face=Arial size=2>What would be the effect on elevator
sensitivity ?</FONT></DIV>
<DIV><FONT face=Arial size=2>Am I going too far ?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Any opinion ?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Xavier</FONT></DIV>
<DIV><FONT face=Arial
size=2></FONT> </DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>