F3B is the original sailplane competition category defined by the Fédération Aéronautique Internationale (FAI). Originally called "Thermal Soaring" it is now called "Multitask Soaring." F3B is a flat field, thermal soaring category where the glider is launched with the help of an electric winch. There are three tasks to perform. Thermal duration, where the goal is to keep flying for 10 minutes and land on the spot; distance, flying the maximum number of laps in four minutes; and speed, flying the minimum time to cover four laps of each. The three tasks have to be flown with the same plane, changing only weight between tasks. Duration is flown at the minimum weight, typically around 2 kg. Speed is flown up to the maximum of 5 kg but typically around 3–4 kg depending on the wind and lift. Distance can be flown at a wide variety of weights, depending on the thermal conditions available, with heavier weights to fly faster and lighter ones to fly slower.