all-new Doman helicopter, the CW-40. The CW-40 was followed a couple of years later by the Doman LZ-5/YH-31. The many innovative features in this helicopter were soon covered by numerous Doman patents. Meanwhile, after the departure of Mr. Frazier, the company was renamed Doman Helicopters, Inc. and moved to Danbury, CT. Doman Helicopters continued for nearly 20 years, building and testing several helicopters and performing other related aircraft work to sustain the company while it attempted to establish itself as a major helicopter manufacturer. The Doman LZ-5/YH-31 helicopters were extensively tested by the company and by the U.S. Army and Navy. They received certification from the United States FAA, and from the equivalent Canadian authority, for sale and commercial use, after passing the rigorous tests necessary for such approvals. Doman LZ-5/YH-31 helicopters toured the U.S. and were well received by potential customers, especially in the oil industry along the Gulf Coast. One even toured in France and Italy performing at the Paris Air Show in 1960. Doman helicopters were a technical success but the company was unable to raise sufficient venture capital to set up an assembly line for mass production. The company ceased operations in 1969 and was legally dissolved shortly thereafter. Wind turbines and careers with other companies In January 1970, Doman went to work for Boeing Vertol – Boeing's helicopter division in Philadelphia. There he continued his helicopter pioneering, working on U.S. Army funded research and patenting additional design improvements for helicopter speed increases and vibration reductions. The 1973 arab oil embargo triggered a great interest in wind energy at Boeing and numerous other companies. While continuing his helicopter innovations, Doman began to conduct wind turbine research. He adapted computer simulation models designed for helicopters to study wind turbines. Doman and his team then built scale-model wind turbines to test them in a wind tunnel normally used for helicopters and airplanes. Doman soon understood the similarities and key differences between wind turbines and helicopters. Wind turbine designers with no experience in helicopters might not know the lessons-learned from the history of helicopter technology, but by the mid-1970s Doman had more than 30 years of such learning that was directly applicable to wind turbines. Boeing's MOD-2 with the Doman-conceived flexible design, two-bladed wind turbine with a teeter hinge, became a flagship achievement in a 7-year NASA managed wind energy program for the U.S. Department of Energy and the