Numerical investigation on the performance of ducted propeller Aldias Bahatmaka, Dong-Joon Kim, Deddy Chrismianto, Joga Dharma Setiawan and Aditya Rio Prabowo MATEC Web Conf., 138 (2017) 07002 Published online: 30 December 2017 DOI: 10.1051/matecconf/201713807002