H-44
The Hiller XH-44 (an internal company designation) was an experimental coaxial rotor helicopter that flew in 1944. Other sources suggest that the Boeing/Vertol(Piasecki) H-21 Flying Banana was also designated as the H-44. Yet other sources suggest that the H-44 designation was not used, to avoid conflict with Hiller H-44. The H-44 designation is also attributed to the Air Force 1959 secret project "Big Tom" of which nothing more is known.
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