Photographer: Frank MacSorley. Kaman electronic testbed.

The K-225 is an experimental intermeshing rotors helicopter developed by Kaman Aircraft and built at the company's original factory at KBDL. The success of the concept led to the development of the HTK-1 and HOK-1 and eventually the HS-43 Huskie. This example was the fifth helicopter built by Kaman and the company's oldest surviving aircraft.

Another nice shot of an early Kaman helicopter, the second. 190 stood for the number of horsepowers in the Lycoming engine. Photo by: Bernard Hoffman / Life

Other photos show N74148 involved in agricultural work, and on the Mall in Washington DC in 1950. Photo from: National Museum of the US Navy

Unsuccessful twelve-passenger derivative of the H-43 Huskie. The sole prototype is seen powered here by two Boeing YT60 turboshafts, which were later replaced with PT6 units. Photo seems to have been taken in Bloomfield. Photo from: Vertical Flight Society

A flying shot of this early Kaman helicopter. Photo from: Iredell County Public Library

The fifth Kaman helicopter, which survives in the New England Air Museum as a K-225. It was reportedly flown by Jack Reynolds, a crop dusting pilot from Candor, North Carolina. Photo from: Iredell County Public Library

1949-built twin-seat experimental helicopter design with twin intermeshing rotor blades. This was the fifth of seven completed and was retained by Kaman for development work. The US Navy and Coast Guard tested a few in the early 1950s.