American X-47B drone. Data picture A while ago, the Anka-3 MIUS UAV independently developed by Türkiye made its first test flight. The flight time was 70 minutes, and it reached a flight height of 2438 meters and a flight speed of 277.8 kilometers per hour. This drone adopts a tailless wing body layout and is designed with flaps and wing side split speed reducers. A flying wing aircraft is a type of aircraft with a special layout, characterized by the main part of the fuselage being integrated inside the wings, making the entire aircraft look like a huge wing surface. This design improves aerodynamic efficiency and achieves complex flight maneuvers through clever aerodynamic layout. In addition, the wing tips of the flying wing aircraft are equipped with speed reducers, which can play a unique role during flight. When the aircraft is flying forward, if one side of the deceleration plate is opened, that side will experience a backward force, forming a moment of opposite direction deflection. For example, when the left deceleration plate is opened, the left side of the aircraft will be subjected to a force to the right rear, forming a moment of leftward deflection, causing the aircraft to deflect to the left; On the contrary, when the right speed brake is opened, the aircraft will deflect to the right. When the speed reducers on both sides are opened simultaneously, the left and right deflection torques cancel each other out, and the aircraft does not deflect, but the backward resistance is added to achieve aircraft deceleration. In addition, some flying wing aircraft use a split type resistance rudder (SDR) for heading control. For example, the B-2 bomber has a pair of split wing surfaces on the rear side of its fuselage. When it needs to change course, according to flight control instructions, one side SDR is deployed and the other side SDR is closed through mechanical transmission or other means. Asymmetric resistance is generated near the left and right wings to deflect the aircraft. When both SDRs are deployed simultaneously, they can be used as speed reducers. Another method is to use differential pressure to control heading. For example, the X-47B unmanned aerial vehicle with tailless design is like this, with a movable baffle in the middle of its tailpipe that can adjust the direction of the jet and use the jet effect to generate lateral force to control the heading. It is worth mentioning that the yaw direction of a flying wing aircraft is unstable. This means that once the aircraft deviates during flight, it cannot automatically return to the center position under the influence of wind. Therefore, a flying wing aircraft requires a flight control system to continuously monitor whether the aircraft is yawing and adjust the flight direction in real time. When the aircraft deviates to the left, the flight control system will automatically pull the aircraft to the right; When the aircraft deviates to the right, the flight control system will automatically pull the aircraft to the left to ensure that the flying wing aircraft does not lose control. Overall, a flying wing aircraft is a type of aircraft with unique design concepts and excellent performance, which places high demands on technological applications in fields such as aerodynamics, materials science, and flight control. In the future, with the advancement of technology, flying wing aircraft are expected to have a wider range of applications and developments. (New Society)