Fred
The stall on the Europa is critically affected by the position and size
of the LE radius, Don and his aerodynamicist friend David tweaked the
leading edge, it's quite a sharp radius and there is a minute bulge
underneath. Hard to spot it but it does have a marked effect if it isn't
accurate.
On a couple of Europas I was involved with (both Classics) I made
templates of the first 10 inches of section at about 8 stations and the
builders spent many hours sanding to these templates. The stalls on both
these aircraft are relatively benign, unlike that of G-KWIP. Both are
fast too. It is all too easy to sand off the bumps in the section which
are meant to be there.
I have tried to attach a dwg file of the section coordinates/
Graham
Fred Klein wrote:
>
>
> On Thursday, May 10, 2007, at 02:41 PM, Graham Singleton wrote:
>
>> VGs were applied to the wing and canard of a Long EZ, which has
>> laminar sections on both, to reduce stall speed, the VGs re energise
>> the laminar boundary layer and help to prevent separation after the
>> max thickness point of the section. Stall was reduced by 7 kts.
>> Graham
>
>
> So here's a question...
>
> Is it conceivable that adding VGs to the Europa could reduce the stall
> speed sufficiently to meet the LSA requirements?
>
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