The Ugears Mad Hornet Airplane is a “medium” difficulty DIY wooden model with 354 parts, promising 8 hours of enjoyable assembly time. The model aircraft is powered by a winding coil spring motor, often used in watch mechanisms and other precision instruments. Various sets of gears transmit spring power to the moving parts of the aircraft. The Mad Hornet offers two modes: pre-flight check mode and taxi mode. Choose the mode by setting the rotating drum to one of two positions. Insert the special key into the slot of the stopper, then give up to 21 pulls on the winding rope. Place the plane on a flat surface, then remove the key and watch your plane come to life. In check mode, the propeller turns while the wing flaps and tail rudder wiggle, before the plane automatically switches to taxiing across the airfield to the runway for takeoff. In taxi mode, your plane starts taxiing immediately, traveling up to 2.5 meters!