Ocean engineering is a vibrant field of engineering, with potential for great economic and societal impacts. When novel concepts are envisioned, the first step if often model scale testing that may be accompanied by numerical modelling. Case studies from academic and industrial research on developments in ocean engineering will be discussed. A chosen focus topic is frictional drag reduction for marine vehicles and other ocean engineering applications – green2. We cover the hot topics, history of over optimism and settling, physical limits and future promise. With experience from taking concepts through small-scale laboratory studies, to Re = O(2×108) experiments utilizing national facilities, and finally leading multimillion dollar sea trials at full-scale, your instructor will discuss topics from basics of model testing to modern and upcoming state-of-art techniques of practical relevance that have already delivered significant emission and cost reduction.