The Hirobo 0403-946 MD 500E is a 50 size scale version of the popular Hughes 500D helicopter reproduced with faithful scale details. This fuselage is designed to be installed in Hirobo SDX HPM/SWM, Sceadu (Evolution HPM/SWM/50, EX HPM/SWM/50 HPM/SWM/50) helicopters. The MD Helicopters MD 500 series is an American family of light utility civilian and military helicopters. The MD 500 was developed from the Hughes 500, a civilian version of the US Army's OH-6A Cayuse/Loach.