REFLECTOR:Lower Winglets

Chuck Jensen reflector@tvbf.org
Tue, 27 Jan 2004 17:10:04 -0500


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It works real well as a skid!
 
Chuck

-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On Behalf Of
Al Gietzen
Sent: Tuesday, January 27, 2004 12:06 PM
To: reflector@tvbf.org
Subject: RE: REFLECTOR:Lower Winglets



I should have been more clear - removing the lower

winglets effectively reduces the total wing area which

I wanted to replace (that whole canard-to-main wing

balancing act). I also wanted to replace the lost

"tail-feathers" for yaw stability. As you pointed out,

there certainly are other aerodynamic effects. 

 Do you suspect the wing without the lower winglets

will be less efficient at cruise (slower) or just less

stable at the low end?  Duane didn't indicate N97XL

exhibited any nasty behavior at low speeds - then

again, he flies these things for a living...

 

Thanks, Pat

   

I don't know.  I'd expect that at cruise it makes little difference; a tad
more efficiency offset by a bit more drag.  If I put on a lower "winglet" it
will be of different design; maybe more along the lines of what Klaus did on
his vari-eze.

 

The issue has been raised about the relative importance of the lower winglet
on the longwing vs the standard wing.  Just of the top of my head, I can't
see any reason for a difference aerodynamically.  It may be just that it is
more noticeable on the longer wing because of the "moment arm" it is acting
upon; or just the different drag characteristic of the wing at low speed.
You'd think it might be more important the higher the wing loading, rather
than the reverse.  

 

Or maybe its use as a "skid" is really the most important :-).

 

Al


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<DIV><SPAN class=921120522-27012004><FONT face=Arial color=#0000ff size=2>It 
works real well as a skid!</FONT></SPAN></DIV>
<DIV><SPAN class=921120522-27012004><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=921120522-27012004><FONT face=Arial color=#0000ff 
size=2>Chuck</FONT></SPAN></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> reflector-admin@tvbf.org 
  [mailto:reflector-admin@tvbf.org]<B>On Behalf Of </B>Al 
  Gietzen<BR><B>Sent:</B> Tuesday, January 27, 2004 12:06 PM<BR><B>To:</B> 
  reflector@tvbf.org<BR><B>Subject:</B> RE: REFLECTOR:Lower 
  Winglets<BR><BR></FONT></DIV>
  <DIV class=Section1>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN style="FONT-SIZE: 11pt">I 
  should have been more clear - removing the lower</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt">winglets effectively reduces the total wing area 
  which</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN style="FONT-SIZE: 11pt">I 
  wanted to replace (that whole canard-to-main wing</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt">balancing act). I also wanted to replace the 
  lost</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt">"tail-feathers" for yaw stability. As you pointed 
  out,</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt">there certainly are other aerodynamic effects. 
  </SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt">&nbsp;Do you suspect the wing without the lower 
  winglets</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt">will be less efficient at cruise (slower) or just 
  less</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt">stable at the low end?&nbsp; Duane didn't indicate 
  N97XL</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt">exhibited any nasty behavior at low speeds - 
  then</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt">again, he flies these things for a 
  living...</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt"></SPAN></FONT>&nbsp;</P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt">Thanks, Pat</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Nimrod size=2><SPAN 
  style="FONT-SIZE: 11pt">&nbsp;&nbsp; </SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Verdana size=2><SPAN 
  style="FONT-SIZE: 11pt; FONT-FAMILY: Verdana">I don&#8217;t know.&nbsp; I&#8217;d expect 
  that at cruise it makes little difference; a tad more efficiency offset by a 
  bit more drag. &nbsp;If I put on a lower &#8220;winglet&#8221; it will be of different 
  design; maybe more along the lines of what Klaus did on his 
  vari-eze.</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Verdana color=black size=2><SPAN 
  style="FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: Verdana"></SPAN></FONT>&nbsp;</P>
  <P class=MsoPlainText><FONT face=Verdana color=black size=2><SPAN 
  style="FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: Verdana">The issue has been 
  raised about the relative importance of the lower winglet on the longwing vs 
  the standard wing. &nbsp;Just of the top of my head, I can&#8217;t see any reason 
  for a difference aerodynamically. &nbsp;It may be just that it is more 
  noticeable on the longer wing because of the &#8220;moment arm&#8221; it is acting upon; 
  or just the different drag characteristic of the wing at low speed.&nbsp; 
  You&#8217;d think it might be more important the higher the wing loading, rather 
  than the reverse. &nbsp;</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Verdana color=black size=2><SPAN 
  style="FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: Verdana"></SPAN></FONT>&nbsp;</P>
  <P class=MsoPlainText><FONT face=Verdana color=black size=2><SPAN 
  style="FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: Verdana">Or maybe its use 
  as a &#8220;skid&#8221; is really the most important </SPAN></FONT><FONT face=Wingdings 
  color=black><SPAN 
  style="COLOR: black; FONT-FAMILY: Wingdings">J</SPAN></FONT><FONT face=Verdana 
  color=black><SPAN 
  style="COLOR: black; FONT-FAMILY: Verdana">.</SPAN></FONT></P>
  <P class=MsoPlainText><FONT face=Verdana color=black size=2><SPAN 
  style="FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: Verdana"></SPAN></FONT>&nbsp;</P>
  <P class=MsoPlainText><FONT face=Verdana color=black size=2><SPAN 
  style="FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: Verdana">Al</SPAN></FONT></P></DIV></BLOCKQUOTE></BODY></HTML>

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