PF,
Since you are asking the question I assume you suspect there is some
sort of a problem caused by your winglets. It probably is not your
imagination. I had a type of glider a few years ago that had a
reputation for being unstable at low airspeeds, but could be much
improved with winglets. It came with Masak winglets so for about the
first 100 hours I never flew with the factory tips because as poor as
the handling was I thought it would be worse without the winglets. And
the glider still felt unstable. Finally as an experiment I flew with
the factory tips and discovered it had MUCH better handling
characteristics. I never flew with the winglets again. Upon closer
inspection I noted that one winglet was visibly mis-aligned with the
wing leading edge.
Not sure what it would have cost to fix it since I sold the glider, but
the moral to the story is that the low cost answer may simply be to fly
with the factory tips. The Schempp Hirth engineers probably knew what
they were doing when they designed the factory tips for your Discus.
Respectfully,

Peter F wrote:
Hi Folks,

Two questions

1) Anyone out there know how to check the alignment
of winglets that have been retrofitted to a Discus
(CS if it makes any difference)?
I believe this is fairly critical & if it's wrong then
I'm better off flying with the 'normal' tips

2) Anyone out there have access to a study done in
the early nineties, by David Colling I think, on turbulator
tapes for Discus Winglets?

Thanks

PF