How many wingtips can one glider have?! A look at some rather unique shark fin like tips.
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Gliders / Sailplanes in this video:
SchemppHirth Ventus cT

The Thermal Podcast interviewing Mark Maughmer
https://thethermalpodcast.libsyn.com/...
Starting at 17 minutes

Equipment Used to Make this Video:
GoPro Hero 8 https://amzn.to/3kvPZZc
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Sony ZV1 https://amzn.to/2FRAF9Y
SPOT 3 Satellite Tracker https://amzn.to/307w8rB

00:00 Intro
00:26 The 15m Wingtips and Winglets
01:25 The 17.6 wing extensions
02:17 The unique 18m 'Borrowski' wing extensions
04:13 Roll Rate Comparison 15m vs 17.6m
05:00 Why choose short wings vs long
06:00 Conclusion