REFLECTOR:Trailing Edge Fences
Scott Baker
reflector@tvbf.org
Thu, 22 Jan 2004 20:58:53 -0500
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Dave,
Chris Martin recently posted a lengthy report on the benefits of =
trailing edge fences and the improvements he has seen in his XL-RG. The =
following is from his post to the Reflector on January 18 (4-days ago).
The design of these fences is the brain child of Klaus Savier. A =
brilliant
guy who holds all of the speed records in his Long EZe.. He also makes =
the
Light Speed Ignition system which I am using two of in my plane. I'm =
flying
an XL RG with a Lyc. IO540 and a MT prop. The addition of the fences, 2
each wing, have made the plane much easier to control in landing's and
takeoff's. The plane just flys straighter when the gear is down. Many
people have a problem of the gear doors acting like rudders and pulling =
the
plane around. The fences make it fly like it's on rails. I have noticed
that starting a turn now definitely needs to be lead with rudder =
especially
below 120 kts. So, just in handling alone it was worth it. Take offs and
landings are also improved by a reduction of 200 to 300 feet. The final
blessing was an increased top speed. I worked with Klaus Savier in the
design of these and Klaus said that the improved wing efficiency at high
speed causes the angle of attack to be reduced by about 1 to 1.5 =
degrees.
This gives you a lower profile and subsequent reduced drag. Thus a speed
improvement of 3 to 4 knts. At present I have two fences per wing and am
considering 1 more at Klaus's suggestion. My fences are on each side of =
the
aileron. When I add the third it will be 2/3 of the distance from the =
end
of the aileron to the winglet.
I attached some of the other builders comments from the archives and =
will
try to get you some pictures .
Chris Martin
=20
> ----- Original Message -----
> From: "Dave Teter" <ezaviator@truetechsys.com>
> To: <reflector@tvbf.org>
> Sent: Thursday, January 22, 2004 5:15 PM
> Subject: REFLECTOR:Trailing Edge Fences
>=20
>=20
> > Is anybody flying a Velocity with trailing edge fences? If so, =
what's your
> > comment on benefit?
> >
> > Dave
> > 173 FG Elite
> > N127DH
> >
> > _______________________________________________
> > To change your email address, visit
> http://www.tvbf.org/mailman/listinfo/reflector
> >
> > Visit the gallery! www.tvbf.org/gallery
> > user:pw =3D tvbf:jamaicangoose
> > Check new archives: www.tvbf.org/pipermail
> > Check old archives: =
http://www.tvbf.org/archives/velocity/maillist.html
>=20
> _______________________________________________
> To change your email address, visit =
http://www.tvbf.org/mailman/listinfo/reflector
>=20
> Visit the gallery! www.tvbf.org/gallery
> user:pw =3D tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: =
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>
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<DIV><FONT face=3DArial size=3D2>Dave,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Chris Martin recently posted a lengthy =
report on=20
the benefits of trailing edge fences and the improvements he has seen in =
his=20
XL-RG. The following is from his post to the Reflector on January =
18=20
(4-days ago).</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><EM>The design of these fences is the =
brain child=20
of Klaus Savier. A brilliant<BR>guy who holds all of the speed records =
in his=20
Long EZe.. He also makes the<BR>Light Speed Ignition system which I am =
using two=20
of in my plane. I'm flying<BR>an XL RG with a Lyc. IO540 and a MT prop. =
The=20
addition of the fences, 2<BR>each wing, have made the plane much easier =
to=20
control in landing's and<BR>takeoff's. The plane just flys straighter =
when the=20
gear is down. Many<BR>people have a problem of the gear doors acting =
like=20
rudders and pulling the<BR>plane around. The fences make it fly like =
it's on=20
rails. I have noticed<BR>that starting a turn now definitely needs to be =
lead=20
with rudder especially<BR>below 120 kts. So, just in handling alone it =
was worth=20
it. Take offs and<BR>landings are also improved by a reduction of 200 to =
300=20
feet. The final<BR>blessing was an increased top speed. I worked with =
Klaus=20
Savier in the<BR>design of these and Klaus said that the improved wing=20
efficiency at high<BR>speed causes the angle of attack to be reduced by =
about 1=20
to 1.5 degrees.<BR>This gives you a lower profile and subsequent reduced =
drag.=20
Thus a speed<BR>improvement of 3 to 4 knts. At present I have two fences =
per=20
wing and am<BR>considering 1 more at Klaus's suggestion. My fences are =
on each=20
side of the<BR>aileron. When I add the third it will be 2/3 of the =
distance from=20
the end<BR>of the aileron to the winglet.<BR><BR>I attached some of the =
other=20
builders comments from the archives and will<BR>try to get you some =
pictures=20
.<BR><BR>Chris Martin<BR></EM></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2> <BR>> ----- Original Message =
-----<BR>>=20
From: "Dave Teter" <</FONT><A =
href=3D"mailto:ezaviator@truetechsys.com"><FONT=20
face=3DArial size=3D2>ezaviator@truetechsys.com</FONT></A><FONT =
face=3DArial=20
size=3D2>><BR>> To: <</FONT><A =
href=3D"mailto:reflector@tvbf.org"><FONT=20
face=3DArial size=3D2>reflector@tvbf.org</FONT></A><FONT face=3DArial=20
size=3D2>><BR>> Sent: Thursday, January 22, 2004 5:15 PM<BR>> =
Subject:=20
REFLECTOR:Trailing Edge Fences<BR>> <BR>> <BR>> > Is anybody =
flying=20
a Velocity with trailing edge fences? If so, what's your<BR>> > =
comment on=20
benefit?<BR>> ><BR>> > Dave<BR>> > 173 FG =
Elite<BR>> >=20
N127DH<BR>> ><BR>> >=20
_______________________________________________<BR>> > To change =
your=20
email address, visit<BR>> </FONT><A=20
href=3D"http://www.tvbf.org/mailman/listinfo/reflector"><FONT =
face=3DArial=20
size=3D2>http://www.tvbf.org/mailman/listinfo/reflector</FONT></A><BR><FO=
NT=20
face=3DArial size=3D2>> ><BR>> > Visit the gallery! =
</FONT><A=20
href=3D"http://www.tvbf.org/gallery"><FONT face=3DArial=20
size=3D2>www.tvbf.org/gallery</FONT></A><BR><FONT face=3DArial =
size=3D2>> >=20
user:pw =3D tvbf:jamaicangoose<BR>> > Check new archives: =
</FONT><A=20
href=3D"http://www.tvbf.org/pipermail"><FONT face=3DArial=20
size=3D2>www.tvbf.org/pipermail</FONT></A><BR><FONT face=3DArial =
size=3D2>> >=20
Check old archives: </FONT><A=20
href=3D"http://www.tvbf.org/archives/velocity/maillist.html"><FONT =
face=3DArial=20
size=3D2>http://www.tvbf.org/archives/velocity/maillist.html</FONT></A><B=
R><FONT=20
face=3DArial size=3D2>> <BR>>=20
_______________________________________________<BR>> To change your =
email=20
address, visit </FONT><A=20
href=3D"http://www.tvbf.org/mailman/listinfo/reflector"><FONT =
face=3DArial=20
size=3D2>http://www.tvbf.org/mailman/listinfo/reflector</FONT></A><BR><FO=
NT=20
face=3DArial size=3D2>> <BR>> Visit the gallery! </FONT><A=20
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size=3D2>www.tvbf.org/gallery</FONT></A><BR><FONT face=3DArial =
size=3D2>> user:pw =3D=20
tvbf:jamaicangoose<BR>> Check new archives: </FONT><A=20
href=3D"http://www.tvbf.org/pipermail"><FONT face=3DArial=20
size=3D2>www.tvbf.org/pipermail</FONT></A><BR><FONT face=3DArial =
size=3D2>> Check=20
old archives: </FONT><A=20
href=3D"http://www.tvbf.org/archives/velocity/maillist.html"><FONT =
face=3DArial=20
size=3D2>http://www.tvbf.org/archives/velocity/maillist.html</FONT></A><B=
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