Yep, hand-made carbon fiber parts for niche applications are unavoidably expensive. Flying one of these things is like tossing a decent spec Macbook into the air and hoping you don't get it stuck in a tree.
F3K and F3J refer to numbered sections within the competition rules[1] set by the Federation Aeronautique Internationale (FAI). FAI is the Geneva-based organization that tracks most "official" flight records for all kinds of aircraft.
F3K is the hand-launched glider class and F3J is the thermal duration soaring class.
The community has adopted these designations as a shorthand for the aircraft types, sort of like how in the U.S. people refer "401(k) accounts" or "501(c)(3) organizations."
F3K and F3J refer to numbered sections within the competition rules[1] set by the Federation Aeronautique Internationale (FAI). FAI is the Geneva-based organization that tracks most "official" flight records for all kinds of aircraft. F3K is the hand-launched glider class and F3J is the thermal duration soaring class.
[1] https://www.fai.org/sites/default/files/documents/sc4_vol_f3...
The community has adopted these designations as a shorthand for the aircraft types, sort of like how in the U.S. people refer "401(k) accounts" or "501(c)(3) organizations."