Hexacopter Tarot FY 680 Heavy lift test and Crash

I wanted to test my new hexacopter with heavy load. When equipped with BL gimbal, Sony Nex5 and video link, that should be around 1 kg of extra load. So test with 1.5 kg load gives me 500 g reserve.

Flies great, except I don't hear low voltage beeper and crashed it in the end, so next time I turned the Naza Voltage Monitor back on, since visual signalization works better for me. Also, Naza limits the throttle when voltage drops so I can also "feel" it loses energy and it's time to land.

Specification:
Tarot FY680 carbon fiber frame
Naza + GPS
HobbyKing F-30A ESCs with SimonK FW
http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=15205
Turnigy 4822-690 kV motors
12x3,8 carbon fiber propellers
Battery 4S 7750 mAh (4500 + 3250 in parallel)

AUW without load: 2.6 kg (hexa with batteries)
Load: 1.5 kg (1.5 l of water in bottle)
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Total weight 4.1 kg
Flight time: approx. 9:30

Видео Hexacopter Tarot FY 680 Heavy lift test and Crash канала Alek B