On Monday, October 31, 2011 10:51:09 AM UTC-4, Rick Walters wrote:
SH does not publish their airfoil data, or glide polars for that
matter.
The Ventus airfoil has changed in subtle ways since the 1981 a/b model
introduction.
The most notable changes have been a sharper leading edge and a
thinner profile near the wingtip,
which showed up on the V2a/b and C models. Take Bob's advice and sand,
smooth, and polish.

Rick

Note also that the airfoils (even on the original
Ventus) are tailored for the Reynolds number change
towards the tip. One well-known expert measured the
coordinates near the root and just scaled them down,
reprofiled the wing using the (incorrect) airfoils
near the tip, and reported an (incorrectly measured)
performance improvement !

If you didn't get the coordinates from SH, beware
of any profile you might obtain...

So, smooth and pray ;-)

See ya, Dave "YO electric"