Record(Croatia) - 85 minutes endurance quadcopter multirotor

it is real, dont doubt, it costs around 450-500$ all together! flies 90 minutes alone or 65 minutes with brushless gimbal + gopro + fpv gear (tested!) u have to solder together 16 li-ion batt in one, so u have 4S4P setup, but even without it, it flies over 50-60 minutes easily on Li-Po, key is in efficient setup, big propellers and low KV motors, and very light frame, under 100grams! build log: (use google translate) http://www.flyfreak.net/multirotor/quad-ltf-%28long-time-flight%29/ Ferdinand's setup: 12mm carbon tubes (1mm thickness) base frame (no standard centerplates, just build a cross and stiffened it up with CF and small CF pieces. 5010-14 rctimer.com motors 360 KV 17x5,5 rctimer.com props 10A Plush Esc Naza 4S4P Panasonic NCR18650b (770gr) 13600mAh nominal LiIon (LiPo works great too, but keep weight same=800gr=a bit less mAh=bit shorter flight time, but much cheaper and faster recharge, remeber, LiIon charges for 4-6 hours!) AUW 1570gr