The 412 is a modification of the original Bell 205 "Iroquois" of Viet-Nam fame. The 212 UH1-N is a twin-engined modification of an earler model, the Bell 204 "Huey" UH1-H, and the four-bladed rotor version is the 412. The 204 is powered by a single Lycoming T-53 engine, while the 212 and 412 are powered by two Pratt and Whitney PT-6 engines. Of course, many other modifications have also been made. A real workhorse on the North Slope and all over Alaska, this model was made for one of the all-time, high-time 412 pilots, fellow Great Dane owner, and friend, George Nisson.