Dragon Fly - A fast 10 Foot Hydroplane for Outboard Motors. Dragonfly is a hydroplane that is adapted to all classes of aulboard motors from the 4 h.p. rowboat motor to the largest racing engines. Streamlined in design, the constructional features are unique and present such developments as extended motor wells for quick planing action, and a combination of vee and convex bottom for safe and super efficient high speed operation with low and high powered outboard motors.