Just did a lift test. Put a 10lb barbell on a scale, zeroed it, and tied it to the bird. Scale read -8 before the weight would start floating around on the driveway. I would guess maintainable payload would be in the 7.5lb neighborhood on a full battery. I wouldnt expect more than 7 minutes of usable flight time at that load. (I get the 34 mins of hover at dry weight)