REFLECTOR:Lower Winglets

Wed, 28 Jan 2004 17:40:13 +1100

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Al,

Most of the designs of effective lower winglets as appear on other =
aircraft, kick the winglet out at a decent angle (rather than up and =
down) and have more of a tapered shape - I would love to know the =
reasons why the Velocity is different in this regard...can anybody shed =
any light? ....Could be better visual aesthetics I suppose.

Forever curious!

Greg in Sydney.
  ----- Original Message -----=20
  From: Al Gietzen=20
  To: reflector@tvbf.org=20
  Sent: Wednesday, January 28, 2004 4:59 PM
  Subject: RE: REFLECTOR:Lower Winglets

  One notable result of not having the lower winglet is increased speed, =

  which doesn't quite jibe with the above discourse?

  Scott=20

  Oh, I think it could.  Airfoils producing a force cause drag.  The =
winglets cause drag, but they produce a force we need for handling and =
stability.  I'd expect the Velocity lower winglets to cause drag at =
cruise without much in the way of offsetting benefit.  Apparently there =
is some handling benefit at lower speeds.

  Do you have any with/without data about the increased cruise speed?

  Al

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<BODY lang=3DEN-US vLink=3Dpurple link=3Dblue bgColor=3D#ffffff>
<DIV>Al,</DIV>
<DIV>&nbsp;</DIV>
<DIV>Most of the designs of effective lower winglets&nbsp;as appear=20
on&nbsp;other aircraft, kick the winglet out at a decent angle (rather =
than up=20
and down) and have more of a tapered shape - I would love to know the =
reasons=20
why the Velocity is different in this regard...can anybody shed any =
light?=20
....Could be better visual aesthetics I suppose.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Forever curious!</DIV>
<DIV>&nbsp;</DIV>
<DIV>Greg in Sydney.</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3DALVentures@cox.net href=3D"mailto:ALVentures@cox.net">Al =
Gietzen</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
  href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, January 28, =
2004 4:59=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: REFLECTOR:Lower=20
  Winglets</DIV>
  <DIV><BR></DIV>
  <DIV class=3DSection1>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt">One notable result of not having the lower =
winglet is=20
  increased speed, </SPAN></FONT></P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt">which doesn't quite jibe with the above=20
  discourse?</SPAN></FONT></P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt">Scott </SPAN></FONT></P>
  <P class=3DMsoPlainText><FONT face=3DNimrod size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoPlainText><FONT face=3DVerdana size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; FONT-FAMILY: Verdana">Oh, I think it =
could.&nbsp;=20
  </SPAN></FONT><FONT face=3DVerdana><SPAN lang=3DFR=20
  style=3D"FONT-FAMILY: Verdana">Airfoils producing a force cause =
drag.&nbsp;=20
  </SPAN></FONT><FONT face=3DVerdana><SPAN style=3D"FONT-FAMILY: =
Verdana">The=20
  winglets cause drag, but they produce a force we need for handling and =

stability. &nbsp;I=92d expect the Velocity lower winglets to cause =
drag at=20
 cruise without much in the way of offsetting benefit. &nbsp;Apparently =
there=20
 is some handling benefit at lower speeds.
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: =
Verdana">&nbsp;
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: Verdana">Do you =
have any=20
 with/without data about the increased cruise speed?
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: =
Verdana">&nbsp;
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: black; FONT-FAMILY: =
Verdana">Al</DIV></BLOCKQUOTE></BODY></HTML>

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