F3L (a.k.a. F3RES) is a type of RC gliding, governed by the FAI, where the aircraft is controlled by Rudder, Elevator and Spoiler. No other controlled surfaces are allowed. The gliders are not allowed to have motors. Instead they are launched by a long bungee cord, called a hi-start. The goal of F3L is to … Continue reading F3L / F3RES Thermal Duration Competitions