 Improved Type B-1 drone (Gai 1, 改一) also known as Improved Type 01 drone, is the upgrade of earlier Type B-1 (Type 01) drone.Like its predecessor, Improved Type B-1 (Improved Type 01) drone is also in the same conventional layout with high wing configuration and a pair of skids as landing gear.The drone is petro powered and propulsion is provided by a two-blade wooden propeller driven tractor engine mounted in the nose.