Che Umar, C. M. I. ., & Zulkafli, M. F. (2021). Distance and Rotational Speed Analysis of Coaxial Rotors for UTHM C-Drone. Progress in Aerospace and Aviation Technology, 1(1), 46-55. https://publisher.uthm.edu.my/ojs/index.php/paat/article/view/10301