REFLECTOR: Gap Seals, fences, zig-zag tape

[Al Gietzen]

How do trailing edge fences improve climb rate?

 Doug Holub

 

Good question.  From what I have seen, there is no span-wise under the wing,
although I don't know about out board of the aileron.  I also don't see how
a fence on the out board end of the aileron would affect aileron
effectiveness; so I'm guessing the any improvement in climb rate would come
from fences out-board of the aileron.  Maybe Klaus could explain that I'm
wrong.

 

Al

----- Original Message ----- 

From: Stockman, <mailto:bill.stockman at daytonaero.com>  Bill 

To: Velocity Aircraft <mailto:reflector at tvbf.org>  Owners and Builders list 

Sent: Monday, August 31, 2009 7:46 AM

Subject: Re: REFLECTOR: Gap Seals, fences, zig-zag tape

 

I have flow with the fences now for almost four years and they make a
significant difference.  I experimented with one, two and three on each side
and ended up with one on each side of the ailerons.  They improve ailerons
effectiveness and climb rate.

 

Bill Stockman

Senior Associate

Dayton Aerospace, Inc.

 

937.426.4300 W

937.369.4799 C

bill.stockman at daytonaero.com

 

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Douglas Holub
Sent: Saturday, August 29, 2009 12:22 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Gap Seals, fences, zig-zag tape

 

Sounds like a good idea, Al. Have you got a picture?

 

Doug Holub

----- Original Message ----- 

From: Al Gietzen <mailto:ALVentures at cox.net>  

To: 'Velocity Aircraft <mailto:reflector at tvbf.org>  Owners and Builders
list' 

Sent: Saturday, August 29, 2009 11:57 AM

Subject: Re: REFLECTOR: Gap Seals, fences, zig-zag tape

 

 

Anybody flying with aileron gap seals?  Notice a great improvement in

climb and responsiveness?

 

Scott;

I have flown with the gap seal on, off, on again; and find no detectable
difference.  I suppose it depends on whether there is much of a gap in the
first place.

 

He's using the zig-zag tap in front of the rudders and says it more than

doubled the effectiveness of them at low speeds.  No noticeable

reduction in cruise.   Said he saw them on Klaus S. EZ.

 

Double the effectiveness sounds like too big a change to be true.  OTOH; I
have never really felt that I had a lack of rudder response - but I guess
I've managed to avoid landing in strong cross winds.

 

He also said the trailing edge fences were a dramatic improvement with

no cruise speed penalty.

 

I have a fence on the in-board end of the aileron.  I can't tell you how
much difference it makes because I put them on before ever flying.  I had
seen enough tuff-test info on EZs, and observed oil drop tracks on Velocity,
to know there is span-wise flow under flow separation at high angles of
attack. A fence could only help, and give better aileron authority at low
speeds.

 

Al


  _____  


_______________________________________________
To change your email address, visit
http://www.tvbf.org/mailman/listinfo/reflector

Visit the gallery!  www.tvbf.org/gallery
user:pw = tvbf:jamaicangoose
Check new archives: www.tvbf.org/pipermail
Check old archives: http://www.tvbf.org/archives/velocity/maillist.html


  _____  


_______________________________________________
To change your email address, visit
http://www.tvbf.org/mailman/listinfo/reflector

Visit the gallery!  www.tvbf.org/gallery
user:pw = tvbf:jamaicangoose
Check new archives: www.tvbf.org/pipermail
Check old archives: http://www.tvbf.org/archives/velocity/maillist.html

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tvbf.org/mailman/private/reflector/attachments/20090831/da598b33/attachment-0001.htm>