REFLECTOR: Gap Seals, fences, zig-zag tape

[Scott Derrick]

As I understand it, they inhibit span wise flow. As the air flows more
and more towards the end of the wing, instead of across the wing lift
decreases. Vortilons and trailing edge fences inhibit this span wise flow.

Scott

Douglas Holub wrote:
> How do trailing edge fences improve climb rate?
> Doug Holub
>
>     ----- Original Message -----
>     *From:* Stockman, Bill <mailto:bill.stockman at daytonaero.com>
>     *To:* Velocity Aircraft Owners and Builders list
>     <mailto:reflector at tvbf.org>
>     *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 Owners and Builders list'
>         <mailto:reflector at tvbf.org>
>
>         *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
>
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