控制半径 meaning in English

control radius

Flying time hit maxmum 5 hours , natural falling speed is about 0 . 5 mts second , max . anti - wind at 5 grade , flying speed at 20 - 80 kms hour , height at 15 - 200 meters , effective controllabe radius 1 . 5 kms . the operators are nationally trained personals who drive the no - person - driven aircrafts professionally
飞行时最长达5小时，自然下降高度为每秒0 . 5米左右，最大抗风5级，飞行速度为20 - 80千米小时，飞行高度为15 - 200米，有效控制半径1 . 5公里。