<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=ProgId content=Word.Document>
<meta name=Generator content="Microsoft Word 9">
<meta name=Originator content="Microsoft Word 9">
<link rel=File-List href="cid:filelist.xml@01C8A302.628BA480">
<link rel=Edit-Time-Data href="cid:editdata.mso@01C8A302.628BA480">
<!--[if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style>
<![endif]-->
<title>Thanks Matt, as with any other design change it needs to be tried to
understand the effect</title>
<!--[if gte mso 9]><xml>
<o:OfficeDocumentSettings>
<o:DoNotRelyOnCSS/>
</o:OfficeDocumentSettings>
</xml><![endif]--><!--[if gte mso 9]><xml>
<w:WordDocument>
<w:Zoom>0</w:Zoom>
<w:DocumentKind>DocumentEmail</w:DocumentKind>
<w:EnvelopeVis/>
<w:DoNotOptimizeForBrowser/>
</w:WordDocument>
</xml><![endif]-->
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;
mso-font-charset:0;
mso-generic-font-family:swiss;
mso-font-pitch:variable;
mso-font-signature:1627421319 -2147483648 8 0 66047 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{mso-style-parent:"";
margin:0in;
margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:12.0pt;
font-family:"Times New Roman";
mso-fareast-font-family:"Times New Roman";}
p.MsoNormalIndent, li.MsoNormalIndent, div.MsoNormalIndent
{margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:12.0pt;
font-family:"Times New Roman";
mso-fareast-font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;
text-underline:single;}
a:visited, span.MsoHyperlinkFollowed
{color:blue;
text-decoration:underline;
text-underline:single;}
p.MsoAutoSig, li.MsoAutoSig, div.MsoAutoSig
{margin:0in;
margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:12.0pt;
font-family:"Times New Roman";
mso-fareast-font-family:"Times New Roman";}
pre
{margin:0in;
margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.0pt;
font-family:"Courier New";
mso-fareast-font-family:"Courier New";}
tt
{mso-ascii-font-family:"Courier New";
mso-fareast-font-family:"Courier New";
mso-hansi-font-family:"Courier New";
mso-bidi-font-family:"Courier New";}
span.EmailStyle20
{mso-style-type:personal-reply;
mso-ansi-font-size:10.0pt;
mso-ascii-font-family:Arial;
mso-hansi-font-family:Arial;
mso-bidi-font-family:Arial;
color:navy;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;
mso-header-margin:.5in;
mso-footer-margin:.5in;
mso-paper-source:0;}
div.Section1
{page:Section1;}
-->
</style>
</head>
<body lang=EN-US link=blue vlink=blue style='tab-interval:.5in'>
<div class=Section1>
<p class=MsoNormal><span class=EmailStyle20><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>Thanks
Matt, as with any other design change it needs to be tried to understand the
effect. I always felt that the bottom running stab in knife-edge or the outer
stab when the fuselage is yawed is more effective than the other side and
dominate. In the old days I was able to balance knife-edge pitch by adjusting
one elevator up and the other down. When an annhedral stab is yawed it becomes
unbalanced resulting in a pitch force change towards the top of the fuselage. If
this were true it should also produce a slight roll with yaw. I will probably
never understand as much about pattern plane design as I would like, I just try
things. It either gets better or it gets worse and this is only one of many design
considerations.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle20><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>OH that
rolling circle stuff makes my head hurt. An analog processor would probably
help or one about thirty years younger.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle20><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>Jim <o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle20><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<b><span style='font-weight:
bold'>On Behalf Of </span></b>rcmaster199@aol.com<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, April 20, 2008 12:43
PM<br>
<b><span style='font-weight:bold'>To:</span></b>
nsrca-discussion@lists.nsrca.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Annhedral Stab</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>Jim,</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>Most would
say that anhedral stabs are hype......</span></font><font color=black><span
style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>I prefer to
call them a viable option for pattern models and here're my thoughts on
the subject. First off, fundamentally, they don't change how the wing is
stabilized in pitch compared to a flat stab...same physics apply. Anhedral area
however is the resultant of two component areas, horizontal which
dominates and a vertical which adds to the already eixsting vertical stabilizer
area. It may be thought as area added to the ventral side of the fuse without
adding a subfin. This often helps settle some unwanted thrust vector forces
namely the much cussed and discussed dredded pitch to belly with top rudder.
Does it always work as prescribed? Does anything in our sport ever always work
as prescribed?</span></font><font color=black><span style='color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>Rolling
circles may be helped with anhedral in the stab. When the anhedral angle is
"just right", there is no region during rotation (X degrees from
horizontal) that completely blanks out the stab as can happen with flat stabs.
Does is do wonders? I don't think so but it certainly does not hurt.</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>My new design
will have anhedral in its stab (7-8 degrees)</span></font><font color=black><span
style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>Cheers,</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>MattK</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><![if !supportEmptyParas]> <![endif]></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><![if !supportEmptyParas]> <![endif]></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>-----Original Message-----<br>
From: J N Hiller <jnhiller@earthlink.net><br>
To: NSRCA Mailing List <nsrca-discussion@lists.nsrca.org><br>
Sent: Sun, 20 Apr 2008 2:01 pm<br>
Subject: [NSRCA-discussion] Annhedral Stab</span></font><font color=black><span
style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<pre style='margin-left:.5in;background:white'><tt><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;color:black'>
<div id="AOLMsgPart_0_7ded5693-f244-4f19-bc40-e243e69250d4">Can I open a discussion on why some designs have an annhedral stab?<span style="mso-spacerun: yes"> </span>Was it to lower the effective flying height of the stab to reduce the wing<span style="mso-spacerun: yes"> </span>to stab vertical offset and knife edge belly pitch, or is there some other<span style="mso-spacerun: yes"> </span>reason?<span style="mso-spacerun: yes"> </span>Jim Hiller<span style="mso-spacerun: yes"> </span>_______________________________________________<span style="mso-spacerun: yes"> </span>NSRCA-discussion mailing list<span style="mso-spacerun: yes"> </span><a
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><span style="mso-spacerun: yes"> </span><a
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><span style="mso-spacerun: yes"> </span></span></font></tt><font
size=1 color=black><span style='font-size:9.0pt;color:black'><o:p></o:p></span></font></pre></div>
<div class=MsoNormal align=center style='mso-margin-top-alt:7.5pt;margin-right:
0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt;text-align:center'><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>
<hr size=2 width="100%" align=center>
</span></font></div>
<div id=u8CA7135D40DB55A-17A0-487F>
<p class=MsoNormal style='mso-margin-top-alt:7.5pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>Get the
<a href="http://www.mapquest.com/toolbar?NCID=mpqmap00030000000003"
target="_blank"
title="http://www.mapquest.com/toolbar?NCID=mpqmap00030000000003">MapQuest
Toolbar</a>, Maps, Traffic, Directions & More!</span></font><font
color=black><span style='color:black'> </span></font><font color=black><span
style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</div>
</div>
</body>
</html>