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> </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"> 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? 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> </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"> </SPAN></FONT></P>
<P class=MsoPlainText><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Verdana">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.</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> </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. 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. </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> </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 “skid” 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> </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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