@article{Hwai Yeng_Mohd Nasir_Mansor_2019, title={The Analysis of Lateral Stability of Tailless Camar-3 With Winglets}, volume={6}, url={https://jtse.utm.my/index.php/jtse/article/view/126}, abstractNote={<p><em><span style="font-family: 'Times New Roman'; font-size: small;">This paper analyses the lateral stability of tailless CAMAR-3 Unmanned Aerial Vehicle (UAV) when its tail fin (i.e. V-tail) is reconfigured to the wingtips. A tailless UAV may have longer endurance time, compared to the present configuration of V-tail. Nevertheless, a tailless UAV may experience reduction in lateral stability due to loss of yaw control surfaces. In the preliminary design of tailless-winglets UAV, semi-empirical method is applied to estimate the aerodynamic lateral stability derivatives, in order to investigate the stability of both configurations of UAV. A dynamic test rig based on pure yawing motion is built, to measure the lateral stability derivatives of </span></em><em><span style="font-size: small;"> and </span></em><em><span style="font-size: small;"> The time response data of pure yawing oscillation give the natural frequency and damping ratio that describe the aerodynamic derivatives as a result from wind-on and wind-off tunnel tests. The result indicates that UAV with either configurations are laterally stable. However, the tailless-winglets CAMAR has a 13.86% reduction in aerodynamic yawing-moment-due-to-sideslip derivative </span></em><em><span style="font-size: small;">, compared to CAMAR-3 with V-tail, whereas the aerodynamic yawing-moment-due-to-yaw-rate derivative </span></em><em><span style="font-size: small;"> of tailless-winglets CAMAR is 5.55% lesser thanthat of the CAMAR-3 with V-tail. The lateral stability degrades, as expected, caused by tail stabilizer removal. In conclusion, the idea of tail removal and using winglets as the directional controllers is feasible.</span></em></p>}, number={1}, journal={Journal of Transport System Engineering}, author={Hwai Yeng, Koo and Mohd Nasir, Mohd Nazri and Mansor, Shuhaimi}, year={2019}, month={Dec.} }