WoW! This is my first high quality (ish) biuld. I spend around 2 hours on it. The purpose, a good looking and functioning crain. U can put it at the docks of yeager airport in multiplayer, and transport huge crates of ships driving bye other players with ease. Adds a fun rp element. Now how to work it: Hit 1 and use vtol to controol the balast offset, so ya dont tip whilst carrying cargo (max carry 30,000 lb ish). 2 and trim the rotate the crane. 3 and VTOL to move out the crain arm. 4 and trim to lower crane hook. Overall works very well. Be sure to cheack out the cabin. It has lights corisponding to the activated group, and levers indicating the positioning of each apuratus.. I worked realy hard in this... Enjoy!