U.S. Department of the Interior. In January 1978, Doman returned to Connecticut as Chief Systems Engineer of the wind energy program at Hamilton Standard division of United Technologies. Drawing on Doman's extensive knowledge of rotor dynamics for both helicopters and wind turbines, United Technologies designed and built two of the largest wind turbines ever built up to that time (i.e. WTS-3, WTS-4). Key features of those turbines, in addition to their size, were the use of only two blades (instead of three, which is more common) and the mounting of the blades on a teeter hinge hub. This was analogous to Doman's use of the gimbaled hub on his helicopters, which had 4-bladed rotors. One turbine (WTS-4) was installed and successfully tested at Medicine Bow, Wyoming, and the other (WTS-3) in Sweden. The WTS-4 wind turbine held the world power output record for over 20 years. Throughout all the research studies and the testing of the actual turbines, there was rapid evolution in Doman's thinking on the best design concepts. However, when oil prices plummeted in the mid-1980s, United Technologies deemed the wind energy market to be uneconomical and halted the program. The Italian government took notice of Doman's work, and in July 1987, when Doman retired from United Technologies, he was hired by Aeritalia (the Italian manufacturer later known as Alenia) and moved to Rome to head Italy's wind energy program. In this program, Doman applied his latest thinking to a new machine, considerably improved over the WTS-4 and WTS-3 machines he had designed for installation in Wyoming and Sweden respectively. Under Doman's leadership a team of Italian engineers designed the Gamma 60 wind turbine. The Gamma 60 wind turbine was the world's first variable speed wind turbine with a teetering hinge. Three Gamma 60 wind turbines were manufactured, and one was erected and successfully tested from 1992 - 1997 on the Mediterranean island of Sardinia. There had been intentions to build many more Gamma 60 wind turbines, but Italian politics and a lack of urgency due to relatively low oil prices in the 1990s resulted in the program being cancelled. In 2003, Doman and Italian nuclear mechanical engineer Silvestro Caruso formed a new company, Gamma Ventures Inc., and bought two unused turbines, the engineering drawings, and manufacturing rights from the Italian Gamma 60 project. In 2007, Gamma Ventures sold a turbine and manufacturing rights to the Dutch company