An eight ton medium-sized biplane with a 54-cylinders star engine which is rated at 83.3 HP. Firstly, push the THROTTLE valve to 60, and then use VTOL to slowly adjust the propeller angle to get thrust. When the tail of the aircraft is raised, use PITCH to lower it, and the aircraft can be pulled up. Remember to be careful of Stalling. When the throttle valve is above 60, be careful of plane resonance. When the throttle valve is above 80, be careful of engine reverse and flameout. When the engine is flameout, restart the engine. When the engine out put direction is reversed, the pitch should be adjusted to rverse. The aircraft has a huge wing area, which means the aircraft wing load is small and the take-off speed is low, but at the same time, the aircraft disintegration speed is also low, only 100 kph. AS A PROTOTYPE OF THEORETICAL VERIFICATION, IT REPRESENTS THELOWEST LEVEL OF OUR DESIGN BUREAU, AND THE SUBSEQUENT DESIGN WILL REACH A NEW HEIGHT!