Stamford, Connecticut where he commuted to and from work for Sikorsky in Bridgeport, CT. Doman put strain gages all over the rotor system of a Sikorsky YR-4 to locate the weak points. He then figured out where and how to change the rotor system to achieve longer blade life. Doman's contributions were so vital that Igor Sikorsky himself appealed to Doman's Draft Board to keep him on the test program instead of sending him into the Army or Navy. Doman discovered that the design of the rotor hub was the real cause of the blade failures. For the duration of World War II, he ran a program to match and balance the blades of all the Sikorsky helicopters before they were delivered. Throughout his tenure at Sikorsky, Doman was continuously learning about rotor dynamics. Doman had one very harrowing experience at Sikorsky when he was flying as a test engineer on a YR-4. The pilot had slowed the helicopter to very low speed, and it got into the so-called "vortex ring state" where the blades lose lift and the helicopter thrashes around in an almost uncontrollable fashion. Fatal crashes from such an event have resulted more than once in the history of rotary wing aviation. In this case, however, the pilot somehow got the helicopter flying backwards, which enabled the blades to regain their lifting ability and prevent a crash. While at Sikorsky, Doman got to know Igor Sikorsky, and for years afterwards Doman liked to repeat his favorite quote from Igor Sikorsky, "God takes care of helicopters." The Doman Helicopter company Together with Clinton Frazier, a mathematician and colleague at Sikorsky, Doman left Sikorsky after WW II to further develop and implement his ideas. Doman-Frazier Helicopters, Inc. was established in the autumn of 1945. The company was initially located in the back of a law office in New York City, but soon moved into a barn in Stratford, Connecticut, not far from the Sikorsky plant. With financial assistance from the United States Army Air Corps, Doman obtained a war surplus R-6 Sikorsky helicopter. Doman and his engineering team modified the R-6 by creating an entirely new rotor system which featured a unique gimbaled rotor hub that was subsequently used in all Doman helicopters. After extensive successful flight testing of the modified Sikorsky R-6 (Doman LZ-1A), Doman's team designed and built, in a joint venture with the Curtiss-Wright Corp., an