REFLECTOR: Vortilions and/or VG's?

[Jim Sower]

VGs energize the boundary layer and keep it attached longer and so delay 
the onset of stall. I've never heard of them doing anything measurable 
to inhibit spanwise flow. Vortilons OTOH were put there specifically to 
inhibit spanwise flow and are most active on the lower (high pressure) 
wing surface. I don't know how they delay boundary layer separation 
except as an incidental benefit of reduced spanwise flow.

IIRC vortilons and VGs pretty much address different issues ... Jim S.

Al Gietzen wrote:

> Since the vortilons are there to create a vortex over the wing at high 
> AOA (aid in keeping the flow attached and breaking up spanwise flow), 
> logic would suggest that VGs on the wing are a more effective means of 
> doing the same thing.
>
> Gee, Ron, I guess it’s up to you to fly without and with and let us 
> know the differenceJ.
>
> Awaiting pics of that new paint job . .
>
> Al
>
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