C. M. I. . Che Umar and M. F. Zulkafli, “Distance and Rotational Speed Analysis of Coaxial Rotors for UTHM C-Drone”, PAAT, vol. 1, no. 1, pp. 46–55, Dec. 2021, Accessed: Aug. 13, 2026. [Online]. Available: https://journal.uthm.edu.my/index.php/paat/article/view/10301