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<DIV><FONT face=Arial size=2>Buddy,</FONT></DIV>
<DIV><FONT face=Arial size=2>"Eagle One"? I liked Viagara better. Of
course, with carbon fiber reinforcement, that may be a bitof an
exaggeration.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Your wing question is not a simple one. There
are many many variables in a wing and the effect of each variable is debatable,
even with wind tunnel tests. Our planes demand uniform performance but
very little lift. they fly at slow speeds (low Reynolds numbers) and they
must handle equally well inverted. There is not much research in this
area. Even airfoil design software, like profoil, is of limited
help. </FONT></DIV>
<DIV><FONT face=Arial size=2> This may elicit controversy, but the most
important thing in a pattern wing is planform, given the obvious requirement for
a symmetrical airfoil. The airfoil is important, but less so in our
application since we are limited to symmetrical airfois and we have very little
lift requirements. </FONT></DIV>
<DIV><FONT face=Arial size=2> You need to start with a goal and then make
tradeoffs to achieve that goal. Most people don't want to wade into
these variables and test new wing designs. That's why most planes on the
market are Prophecy wings with a different shaped fuse. Our Entropy
made slight mods to the wing,but this is essentially what it is. The
Aries, on the other hand, is the product of a different lineage of
development with different goals. It is an "unconventional" shape: large
root chord, large sweep back, small tip. The larger root increases
the drag closer to the CG for speed control and stability. This also
moves the center of lift closer to the fuse. Along with the small 9 1/4"
tip chord this helps the tips initate a snap. This is necessary to
conteract the large wing area - which is there to maintain extra stability at
low speed or high alpha. In comparison to the pattern standard wing,
it rolls better and flies slower.</FONT></DIV>
<DIV><FONT face=Arial size=2> You want to understand thse variables
more? A good website is <A
href="http://www.aae.uiuc.edu/m-selig/">http://www.aae.uiuc.edu/m-selig/</A> at
the U of I. There are lots of others. Good airfoil performance plots
are not available for free anywhere I know of (anyone should fee free
to correct me on this point) so you''ll have to buy a good plotting program to
nail it. You can have different airfoils at the root and tip to blend
characteristics.</FONT></DIV>
<DIV><FONT face=Arial size=2> Dihedral is related to wing position
relative to the vertical CG and its relation to the stab is super
critical. Don't ignor the stab airfoils either.</FONT> <FONT
face=Arial size=2>They can actually affect CG position too.</FONT></DIV>
<DIV><FONT face=Arial size=2>--Lance</FONT></DIV>
<DIV> </DIV>
<BLOCKQUOTE
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=BUDDYonRC@aol.com
href="mailto:BUDDYonRC@aol.com">BUDDYonRC@aol.com</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> Wednesday, September 03, 2003 11:43
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Pattern wing design</DIV>
<DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 face=Arial
color=#8000ff size=2 FAMILY="SANSSERIF"><BR>I am in the final stages of
production on my new "Eagle One" design which is a revised fiberglass
fuse. Version of my "Mirage" ( Changed the name for obvious reasons)
.<BR>The first Fuselage is out of the mold and I am looking at possible
revisions to the wings but unfortunately I am wing stupid. <BR>If
there is anyone out there that will provide some insight on the subject it
will be appreciated.<BR>1. Airfoil? Shape and type with advantages and
disadvantages of those currently used on pattern planes <BR>2. Plan size
and shape? Single tapered and double tapered and why?<BR>3. Airfoil
thickness and taper? Equal percentage or higher percentage taper and
why?<BR>4. More sweep or less sweep? (expected effect)<BR>5. Dihedral?
Expected effects.<BR>What are the best being used currently? Why?<BR>I am
currently using a Laminar airfoil 2- 1/8" Max thickness (11.5%), 19" wide at
the root and 9" wide at the tip double tapered with a leading edge sweep of 15
degrees and a trailing edge taper of 2-1/2 degrees plan form with equal
percentage thickness, 34" long and 7 degrees dihedral.<BR>The airplane fly's
good with some small flight imperfections that I think a revision to wing
design may correct. I just want to make sure that I understand what the
expected results of any changes will be before I proceed<BR>Any and all help
will be appreciated.<BR>Buddy </FONT></FONT></BLOCKQUOTE></BODY></HTML>