<!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 6.00.5730.11" name=GENERATOR></HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial>Matt</FONT></DIV>
<DIV><FONT face=Arial>I condensed the Kitplanes article from 2 1/2 pages. Lowest
drag occurs with a sharp TE and a very small angle between the top and bottom
flow. With typical sections a sharp TE moves the separation
point upstream, away from the TE, with a corresponding increase in drag and
poorer, maybe unstable, controll response.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I suppose, with a sailplane, you would want the " cuspy"
looking section.</FONT></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=rcmaster199@aol.com
href="mailto:rcmaster199@aol.com">rcmaster199@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, February 13, 2007 5:04
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Trailing
Edge</DIV>
<DIV><BR></DIV>
<DIV>Nat, Dean,</DIV>
<DIV> </DIV>
<DIV>It seems to me that for the kind of thing we are involved in, the boost
in control performance is desired. Drag is not necessarily our enemy...in fact
quite the contrary. We've been building fattened TEs on our models' control
surfaces and have been deriving the benefits, perhaps unwittingly. It has
been useful information and the benefits would appear to outweigh
the penalty.</DIV>
<DIV> </DIV>
<DIV>However, this may not hold true for other flight regimes. If one
were to look at the wing TE of a 777 for example.....quite sharp. Ditto
for fighters and racers. These are distinct and different regimes than our
interest, with a totally different goal in mind....n'est-ce pas? </DIV>
<DIV> </DIV>
<DIV>On the other hand, sailplanes would probably also benefit and here there
appears to be a mixed bag of thicknesses.</DIV>
<DIV> </DIV>
<DIV>I guess the point is "it depends"</DIV>
<DIV> </DIV>
<DIV>Matt</DIV>
<DIV> </DIV> <BR>-----Original Message-----<BR>From:
d.pappas@kodeos.com<BR>To: nsrca-discussion@lists.nsrca.org<BR>Sent: Tue, 13
Feb 2007 1:25 PM<BR>Subject: Re: [NSRCA-discussion] Trailing Edge<BR><BR>
<STYLE>.AOLPlainTextBody {
FONT-SIZE: 12px; MARGIN: 0px; COLOR: #000; FONT-FAMILY: Tahoma, Verdana, Arial, Sans-Serif; BACKGROUND-COLOR: #fff
}
.AOLPlainTextBody PRE {
FONT-SIZE: 9pt
}
.AOLInlineAttachment {
MARGIN: 10px
}
.AOLAttachmentHeader {
BORDER-RIGHT: #7da8d4 1px solid; BORDER-TOP: #7da8d4 1px solid; BACKGROUND: #f9f9f9; FONT: 11px arial; BORDER-LEFT: #7da8d4 1px solid; BORDER-BOTTOM: #7da8d4 1px solid
}
.AOLAttachmentHeader .Title {
PADDING-RIGHT: 3px; PADDING-LEFT: 3px; BACKGROUND: #b5ddfa; PADDING-BOTTOM: 3px; FONT: 11px arial; PADDING-TOP: 3px
}
.AOLAttachmentHeader .FieldLabel {
PADDING-RIGHT: 10px; PADDING-LEFT: 9px; BACKGROUND: #f9f9f9; PADDING-BOTTOM: 1px; FONT: 11px arial; COLOR: #000000; PADDING-TOP: 1px
}
.AOLAttachmentHeader .FieldValue {
BACKGROUND: #f9f9f9; FONT: 11px arial; COLOR: #000000
}
.AOLAttachmentHeader A {
COLOR: #2864b4; TEXT-DECORATION: none
}
.AOLImage A {
COLOR: #2864b4; TEXT-DECORATION: none
}
.AOLAttachmentHeader A:hover {
COLOR: #2864b4; TEXT-DECORATION: underline
}
.AOLImage A:hover {
COLOR: #2864b4; TEXT-DECORATION: underline
}
.AOLWebSuiteCompose .AOLPicturesFullSizeLink {
OVERFLOW: hidden; WIDTH: 1px; HEIGHT: 1px
}
.AOLWebSuite .AOLPicturesFullSizeLink {
OVERFLOW: hidden; WIDTH: 1px; HEIGHT: 1px
}
BODY {
BORDER-RIGHT: 0px; BORDER-TOP: 0px; FONT-SIZE: 10pt; BORDER-LEFT: 0px; BORDER-BOTTOM: 0px; FONT-FAMILY: "Verdana"; BACKGROUND-COLOR: white
}
.AOLWebSuiteCompose P {
PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px
}
IMG.managedImg {
WIDTH: 0px; HEIGHT: 0px
}
IMG.placeholder {
BORDER-RIGHT: #dadad6 1px solid; BORDER-TOP: #dadad6 1px solid; BACKGROUND: #f4f4f4 no-repeat center center; BORDER-LEFT: #dadad6 1px solid; WIDTH: 275px; BORDER-BOTTOM: #dadad6 1px solid; HEIGHT: 206px
}
</STYLE>
<DIV id=AOLMsgPart_3_2e2e4041-dbdf-4c18-b9b4-b42b9ef812a8>
<STYLE></STYLE>
<DIV><SPAN class=418021118-13022007><FONT face=Arial color=#0000ff size=2>Hi
Nat,</FONT></SPAN></DIV>
<DIV><SPAN class=418021118-13022007><FONT face=Arial color=#0000ff size=2>So
the Princeton Aero department had many of its facilities just a couple of
miles up US Route 1 from the College, at Princeton-Forrestal
airport.</FONT></SPAN></DIV>
<DIV><SPAN class=418021118-13022007><FONT face=Arial color=#0000ff size=2>It
is owned by the University. The land is gradually being gobbled up by
industrial developments and the runway is gone now. Bummer 'cause we used to
hold a Pattern contest there years ago. </FONT></SPAN></DIV>
<DIV><SPAN class=418021118-13022007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=418021118-13022007><FONT face=Arial color=#0000ff size=2>The
SAE weight lifting contest is still a going concern. It sure is neat ...
why wasn't this sort of thing around when I was in Engineering
School?</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV><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"><A
href='javascript:parent.ComposeTo("d.pappas%40kodeos.com", "");'>d.pappas@kodeos.com</A></FONT>
</DIV>
<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> <A
href='javascript:parent.ComposeTo("nsrca-discussion-bounces%40lists.nsrca.org", "");'>nsrca-discussion-bounces@lists.nsrca.org</A>
[<A
href='javascript:parent.ComposeTo("nsrca-discussion-bounces%40lists.nsrca.org", "");'>mailto:nsrca-discussion-bounces@lists.nsrca.org</A>]<B>On
Behalf Of </B>Nat Penton<BR><B>Sent:</B> Tuesday, February 13, 2007 11:29
AM<BR><B>To:</B> NSRCA Mailing List<BR><B>Subject:</B> Re:
[NSRCA-discussion] Trailing Edge<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>Dean</FONT></DIV>
<DIV><FONT face=Arial size=2>The old NACA must have done this research in
the distant past. I recall, in the 80s, Jim Bede extolling on the
virtues. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> The Princeton project, that would be fun,
especially as a student. Would have kept my attention
<G>.
Nat</FONT></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=d.pappas@kodeos.com href="mailto:d.pappas@kodeos.com">Dean
Pappas</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, February 13, 2007
10:03 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion]
Trailing Edge</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=725475815-13022007><FONT face=Arial color=#0000ff
size=2>Thanks Nat,</FONT></SPAN></DIV>
<DIV><SPAN class=725475815-13022007><FONT face=Arial color=#0000ff
size=2>I have a guy in the local club who corroborates Barnaby's
statement. Locally to NSRCA D1, back in the 80's he was known as
"forever in Sportsman George".</FONT></SPAN></DIV>
<DIV><SPAN class=725475815-13022007><FONT face=Arial color=#0000ff
size=2>He is recently retired from teaching at the Aero group at
Princeton U. and he still coaches the students involved in the weight
lifting contest.</FONT></SPAN></DIV>
<DIV><SPAN class=725475815-13022007><FONT face=Arial color=#0000ff
size=2>It was nice to have an excuse to go hunt him
down!</FONT></SPAN></DIV>
<DIV><SPAN class=725475815-13022007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=725475815-13022007><FONT face=Arial color=#0000ff
size=2>later,</FONT></SPAN></DIV>
<DIV><SPAN class=725475815-13022007><FONT face=Arial color=#0000ff
size=2>Dean</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV><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"><A
href='javascript:parent.ComposeTo("d.pappas%40kodeos.com", "");'>d.pappas@kodeos.com</A></FONT>
</DIV>
<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> <A
href='javascript:parent.ComposeTo("nsrca-discussion-bounces%40lists.nsrca.org", "");'>nsrca-discussion-bounces@lists.nsrca.org</A>
[<A
href='javascript:parent.ComposeTo("nsrca-discussion-bounces%40lists.nsrca.org", "");'>mailto:nsrca-discussion-bounces@lists.nsrca.org</A>]<B>On
Behalf Of </B>Nat Penton<BR><B>Sent:</B> Tuesday, February 13, 2007 1:05
AM<BR><B>To:</B> NSRCA Mailing List<BR><B>Subject:</B>
[NSRCA-discussion] Trailing Edge<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>Kitplanes, Dec
06 Wind
Tunnel by Barnaby Wainfan</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>" The airfoil with the chopped trailing
edge will produce slightly more lift at the same angle of attack than a
sharp trailing-edged airfoil. Because the wake is filled in the controll
is crisper and more effective and does not have to move as far to cause
a change in lift"</FONT></DIV></BLOCKQUOTE>
<DIV>
<HR>
<DIV></DIV>_______________________________________________<BR>NSRCA-discussion
mailing list<BR><A
href='javascript:parent.ComposeTo("NSRCA-discussion%40lists.nsrca.org", "");'>NSRCA-discussion@lists.nsrca.org</A><BR><A
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target=_blank>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A></DIV></BLOCKQUOTE></BLOCKQUOTE></DIV><!-- end of AOLMsgPart_3_2e2e4041-dbdf-4c18-b9b4-b42b9ef812a8 -->
<DIV class=AOLPlainTextBody
id=AOLMsgPart_4_2e2e4041-dbdf-4c18-b9b4-b42b9ef812a8><PRE><TT>_______________________________________________
NSRCA-discussion mailing list
<A href='javascript:parent.ComposeTo("NSRCA-discussion%40lists.nsrca.org", "");'>NSRCA-discussion@lists.nsrca.org</A>
<A href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target=_blank>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A>
</TT></PRE></DIV><!-- end of AOLMsgPart_4_2e2e4041-dbdf-4c18-b9b4-b42b9ef812a8 -->
<DIV class=AOLPromoFooter>
<HR style="MARGIN-TOP: 10px">
<A
href="http://pr.atwola.com/promoclk/1615326657x4311227241x4298082137/aol?redir=http%3A%2F%2Fwww%2Eaol%2Ecom%2Fnewaol"
target=_blank><B>Check out the new AOL</B></A>. Most comprehensive set of free
safety and security tools, free access to millions of high-quality videos from
across the web, free AOL Mail and more.<BR></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>NSRCA-discussion
mailing
list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</BLOCKQUOTE></BODY></HTML>