REFLECTOR: Gap Seals, fences, zig-zag tape

[Scott Derrick]

Here's Klaus's explanation on trailing edge fences.

http://www.lightspeedengineering.com/KlausInfo/Flowfence.htm

The picture in the above web page,looks exactly like the ones on the
VariEZ at GNT's this weekend.

Scott


Al Gietzen wrote:
>
> I heard an explanation once, I think it was from Klaus, and my
> recollection is it's because with the spanwise flow corrected, the
> wing generates lift more efficiently, and thus can fly slightly faster
> at the same angle-of-attack, or similarly climb better.
>
>  
>
> Good point. Better flow (lower pressure) above the wing could add lift.
>
> Vortilons, fences, and VGs are all aimed at basically the same issue.
>  The vortilons are intended to generate a vortex over the top of the
> wing at high angles of attack to reduce flow separation, which
> could/should reduce span-wise flow under the separation.  VGs provide
> more, smaller vortices (and thereby more effective means) to help keep
> the flow attached, and a fence attacks the span-wise flow directly,
> but are probably not much help regarding flow searation. 
>
>  
>
> In theory, the vortilons and fences cause near zero drag at cruise
> speeds, whereas the VGs may slow you down couple of knots. It could be
> that the VGs obviate the need for both vortilons and fences, or at
> least the votilons.
>
>  
>
> Good luck with your testing.  Should be interesting.
>
>  
>
> Al
>
>  
>
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