John
you are absolutely right. The trailing edge as designed by Don Dykins
has a slight reflex to reduce drag in the cruise. I did some arm
twisting and got hold of the coordinates of the section.
I like to see the TE about half an inch up from straight.
Graham
John & Paddy Wigney wrote:
> Hi Andrew,
>
> The wing/flap template procedure is a little strange. I assume that
> Europa was trying to protect intellectual property when they only listed
> a discontinuous set of wing top profile data points for the template.
> Anyway, you may be aware that the Europa wing is a laminar flow section.
> Laminar flow wings generally have profiles which look a lot different to
> a regular Clark Y aerofoil say. I think I am correct that the wing is
> very slightly hollow on the upper rear section so that is why it is
> important to use the template. If you use the bottom surface of the flap
> aligned with the wing's bottom surface, you may not get the desired
> result. Very small profile changes can have big impact on wing
> performance. Perhaps others on the list can confirm my ideas.
>
> Cheers, John
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