Welcome to the F3L Contest Series
Promoting thermal duration soaring competition across the United States
About the Series
The F3L Contest Series is dedicated to promoting radio-controlled thermal duration soaring competitions following the international rules for F3L as defined by the Federation Aeronautique Internationale (FAI). Whether you're a seasoned competitor or new to the sport, the F3L Series offers exciting challenges and plenty of fun.
FAI F3L is a discipline of model soaring that emphasizes precision, consistency, and strategy in thermal flying. Pilots launch their wooden 2-meter sailplanes using a hi-start (a bungee and length of line) and attempt to achieve precision duration flight times of 6 minutes within 9-minute working time windows, ending with a spot landing.
Mostly, however, it's about the simple joy of soaring and camaraderie among pilots. This is a team event, where the most important quality of a team member is their level of focus and a positive attitude. Experience and physical abilities help but are not the most important thing.
2026 F3L Series Contests
Get Involved
Whether you want to compete, learn how to build your first F3L sailplane, or host a contest in your area, we're here to help. Explore our resources and join our growing community of thermal soaring enthusiasts.
F3L in Action
Pilots preparing for launch
Beautiful 2-meter F3L sailplanes
Join the Conversation
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