I'd like to share with you the latest development of our small team - a high-load hexacopter project.
The design is intended to be a compromise between price, power and efficiency. The frame made from locally-sourced square aluminium profiles, motors, props and ESC's ordered from Taobao store, batteries from HobbyKing.
Total weight is 20 kg, and according to the specs of the motors, the thrust should be around 60 Kg, meaning that it's theoretically possible to lift a 30 kg payload, although that hasn't been tested yet.
motors: BD9340 100KV - super efficient motors!
ESC: Hobbywing X-Rotor Platinum 80A
batteries: 6x 12000mAh 6S 10-20C 22.2V Turnigy Multistar ( in 12S config., giving 36Ah)
propellers: 3065 CF
The tests that had been run so far:
A test with copter on a stand with 100% throttle on - lasted 22 minutes.
A flight without payload to 3 km distance - used around 25% of battery capacity.
A flight with a 10 kg payload to the distance of 1.5 km - used around 20% of battery capacity.
The last test gives us a probable total flight distance with a 10Kg payload of around 6 km.