Design and research for a new type buoyancy-lifting row flying-wings

It has important sciencfic and engineering applicationsfor aircrafts of low speed to design the buoyancy-lifting aircraft with bothbigger volume and higher aerodynamic efficiency. Based on the aerofoilNACA0030, some aerodynamic configurations of row flying-wings with thehigher volume efficiency (volume/surface) were constructed. Differentarrayed row flying-wings were calculated and investigated minutely. Anaerodynamic configuration of row sweptback flying-wings with the bettermaneuverability and stability was educed. The numerical simulation resultsindicate that the lift-drag ratios of row straight flying-wings and rowsweptback flying-wings increase by up to 40% and 20%, respectively,and the aerodynamic efficiency of aircrafts are improved obviously from theblock of airflow under the anterior flying-wing by the posteriorflying-wing. Meanwhile, the chordwise size of buoyancy-lifting rowflying-wings is comparatively small so that the surface tension of skinmaterial can be reduced availably. This characteristic provides the widerscope on the skin flexible material selection for high altitude aircrafts.