<div>Jim,</div>
<div> </div>
<div>Most would say that anhedral stabs are hype......</div>
<div> </div>
<div>I prefer to call them a<SPAN contentEditable=false style="DISPLAY: inline-block"></SPAN> 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?</div>
<div> </div>
<div>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.</div>
<div> </div>
<div>My new design will have anhedral in its stab (7-8 degrees)</div>
<div> </div>
<div>Cheers,</div>
<div> </div>
<div>MattK</div>
<div><br>
</div>
<div><br>
</div>
-----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<br>
<br>
<div id=AOLMsgPart_0_7ded5693-f244-4f19-bc40-e243e69250d4 style="FONT-SIZE: 12px; MARGIN: 0px; COLOR: #000; FONT-FAMILY: Tahoma, Verdana, Arial, Sans-Serif; BACKGROUND-COLOR: #fff"><PRE style="FONT-SIZE: 9pt"><TT>Can I open a discussion on why some designs have an annhedral stab? Was it to lower the effective flying height of the stab to reduce the wing to stab vertical offset and knife edge belly pitch, or is there some other reason? Jim Hiller _______________________________________________ NSRCA-discussion mailing list <A href="mailto:NSRCA-discussion@lists.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>
<div id='u8CA7135D40DB55A-17A0-487F' class='aol_ad_footer'><FONT style="color: black; font: normal 10pt ARIAL, SAN-SERIF;"><HR style="MARGIN-TOP: 10px">Get the <A title="http://www.mapquest.com/toolbar?NCID=mpqmap00030000000003" href="http://www.mapquest.com/toolbar?NCID=mpqmap00030000000003" target="_blank">MapQuest Toolbar</A>, Maps, Traffic, Directions & More!</FONT> </div>