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Old 06-08-2014, 06:43 AM   #5
RickB
Scraping Paint
 
City: Fort Lauderdale
Vessel Model: CHB 48 Zodiac YL 4.2
Join Date: Oct 2007
Posts: 3,804
Those "winglets" on stabilizer fins help at low speed, not high. They are disadvantageous at high speed. At high speed they just add more drag since fin angle at high speed is very much less to achieve the same force.

prevent water from flowing around the tip which decreases lift and produces a drag producing vortex on the unloaded side, that is why, unlike most aircraft winglets, they work both directions.
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