Mojo Racing Products has a direct bolt on solution for your UL-19 RTR sport hydroplane! $24.99each

Curved turn fins are what works well on today's oval racing RC sport hydroplanes! This fin is based on our best seller 20 size fin blade design. Blade width at s 2.5" and blade depth top of blade to bottom of hook is approximately 3" This fin was designed to be a direct bolt on upgrade for your UL-19 hydro. Make your UL-19 Proboat corner like it's on rails! This fin will enable you to go wide open around the turns, and hold the pins!

This fin features:

Rugged 0.048" blade thickness
One piece design
Pre-Sharpened leading edge
Awesome cornering!
436 high grade stainless steel
Laser precision cut
Laser cut mounting holes to fit UL-19 OEM bracket
Press brake formed curved section
Made in USA!

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https://www.mojoracingproducts.com/c...plane-turn-fin