I forwarded the question to Robert Vess. Here is his reply:<BR><BR><B><I>"Robert J. Vess" <rjvess@mindspring.com></I></B> wrote: <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">From: "Robert J. Vess" <rjvess@mindspring.com><BR>To: "Bob Richards" <bob@toprudder.com><BR>Subject: RE: Fwd: [NSRCA-discussion] Thick trailing edges<BR>Date: Tue, 16 Jan 2007 17:38:04 -0500<BR><BR> <META content="MSHTML 6.00.5730.11" name=GENERATOR> <DIV> <DIV><FONT face="MS Sans Serif" size=2>Bob,</FONT></DIV> <DIV><FONT face="MS Sans Serif" size=2></FONT> </DIV> <DIV><FONT face="MS Sans Serif" size=2>In my airfoil design experience I have found that, generally speaking, thicker trailing edges add a little more aft loading to the airfoil. So this in turn adds hinge moment, which means that the surface tries a bit harder to return to neutral. So this can make it feel more "locked in" around neutral since it
centers better. This is in contrast to "softening the feel around neutral" as the message below reads.</FONT></DIV> <DIV><FONT face="MS Sans Serif" size=2></FONT> </DIV> <DIV><FONT face="MS Sans Serif" size=2>Robert</FONT></DIV> <DIV> </DIV> <DIV></DIV></DIV> <DIV> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid"> <DIV style="FONT: 10pt Arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=bob@toprudder.com href="mailto:bob@toprudder.com">Bob Richards</A> </DIV> <DIV style="FONT: 10pt arial"><B>To: </B><A title=rjvess@mindspring.com href="mailto:rjvess@mindspring.com">Robert J. Vess</A></DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> 1/16/2007 9:52:46 AM </DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Fwd: [NSRCA-discussion] Thick trailing edges</DIV> <DIV><BR></DIV><FONT size=2>
<DIV>Robert,</DIV> <DIV> </DIV> <DIV>Any thoughts??</DIV> <DIV> </DIV> <DIV>Bob R.</DIV> <DIV><BR><BR><B><I>Peter Pennisi <pentagon.systems@bigpond.com></I></B> wrote:</DIV> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">From: "Peter Pennisi" <pentagon.systems@bigpond.com><BR>To: "'NSRCA Mailing List'" <nsrca-discussion@lists.nsrca.org><BR>Date: Tue, 16 Jan 2007 23:32:49 +1000<BR>Subject: [NSRCA-discussion] Thick trailing edges<BR><BR>How effective are thick trailing edges in softening up the feel of a surface<BR>around neutral? Is it a fad or does it actually work.<BR><BR>I am putting together my second model with composite wings which have very<BR>thin trailing edges (Comp-ARF -IMPACT). I have never been really comfortable<BR>with the feel on my first model. I am thinking of removing some of the rear<BR>wing to increase the thickness of the trailing edge (Should not be
too<BR>difficult - only concern will be if ailerons will be large enough to force a<BR>decent snap)<BR><BR>The model came at the right price so it was always destined as a test bed to<BR>try out some ideas.<BR><BR>_______________________________________________<BR>NSRCA-discussion mailing list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</BLOCKQUOTE><BR></FONT></BLOCKQUOTE></BLOCKQUOTE><BR>