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<title>Thanks Matt, as with any other design change it needs to be tried to
understand the effect</title>
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<div class=Section1>
<p class=MsoNormal><span class=EmailStyle23><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>Can you tell me more about "stab tip treatment" and why?<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle23><font size=2 color="#993366"
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>Thanks.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle23><font size=2 color="#993366"
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=EmailStyle23><font size=2 color="#993366"
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>Nat Penton<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, April 20, 2008 11:34
PM<br>
<b><span style='font-weight:bold'>To:</span></b> NSRCA Mailing List<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=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>Anhedral
creates problems only for high yaw rate manuevers. It is difficult to do an
inverted spin - you can't get the nose up. Proper treatment of the stab tips
solves this problem,
however.
Nat</span></font><font color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<div style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:39.75pt;border:none;mso-border-left-alt:solid black 1.5pt;
padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>-----
Original Message ----- </span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:39.75pt;background:#E4E4E4;border:none;mso-border-left-alt:solid black 1.5pt;
padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><b><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black;
font-weight:bold'>
<div style='font-color:black'>From:</span></font></b><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'> <a
href="mailto:jnhiller@earthlink.net" title="jnhiller@earthlink.net">J N Hiller</a>
</span></font></div>
<font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:39.75pt;border:none;mso-border-left-alt:solid black 1.5pt;
padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><b><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black;
font-weight:bold'>To:</span></font></b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'> <a
href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</a> </span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:39.75pt;border:none;mso-border-left-alt:solid black 1.5pt;
padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><b><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black;
font-weight:bold'>Sent:</span></font></b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'> Sunday, April 20, 2008
6:20 PM</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:39.75pt;border:none;mso-border-left-alt:solid black 1.5pt;
padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><b><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black;
font-weight:bold'>Subject:</span></font></b><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'> Re:
[NSRCA-discussion] Annhedral Stab</span></font><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:39.75pt;border:none;mso-border-left-alt:solid black 1.5pt;
padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:39.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><span
class=EmailStyle21><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 style='margin-left:39.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><span
class=EmailStyle21><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 style='margin-left:39.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><span
class=EmailStyle21><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 style='margin-left:39.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><span
class=EmailStyle21><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'> <o:p></o:p></span></font></span></p>
</div>
<div style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt'>
<p class=MsoNormal style='margin-left:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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><font color=black><span style='color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;border:none;mso-border-left-alt:
solid black 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:75.75pt;border:none;mso-border-left-alt:solid black 1.5pt;
padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><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:75.75pt;background:white;border:none;mso-border-left-alt:
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<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>_______________________________________________<span style="mso-spacerun: yes"> </span>NSRCA-discussion mailing list<span style="mso-spacerun: yes"> </span><a
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