Graham,
Sorry I was not clear in my email to you. My references to Ted's radii
were to his trailing edge fillet were to the fillet at the rear of the
flap as viewed in plan form, not in cross section...I would not be one
to mess with Don and David's leading edge!
Fred
On Friday, May 11, 2007, at 02:05 PM, Graham Singleton wrote:
> 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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> <aerofoil47in.dwg>
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