This is it. The big one. One class. 60 pilots. The top 5 will qualify for the in New York in August.
MINI MULTIROTOR CLASS (FORMERLY 250 CLASS)
6 inch (152 millimeter) diameter maximum propeller size
3-bladed and 4-bladed propellers allowed
Maximum frame size 330 millimeter motor to motor, no minimum size
Multirotor craft with 3, 4 or 6 motors
4S maximum LiPo battery, maximum 4.2 volts per cell