Hi,

I went through the same mill a couple of years ago.

If you do a couple of searches on Google Groups for
Colling Discus Turbulator
and
Masak 'New Winglet Design'

You'll find a couple of postings by Peter Masak which
suggest that the laminar flow on his design for the
Discus Winglet extended to about 55% chord on the outer
surface and about 20% on the inner.

I don't know what the relationship between Masak's
winglets and the Schempp factory winglets are.
M&H Soaring sell winglets designed by Mark Maughmer,
but they're also the agents in the US for Schempp Hirth.


Does anyone know the relationship, if any, between
the three sets of winglets (Masak, Maughmer & Schempp
Hirth) for the original Discus?

Regards

Kevin