The following shall aim at describing the actual facts in the correct order to avoid confusion. Sikorsky also appears in the list of the pioneers.Īlready in 1955 Igor Sikorsky had spoken publicly about his interest in the development of an "aerial crane." Following his father’s instructions in 1957 his son Sergei made a sketch of a helicopter which was generally very similar to the S-64 Sky Crane. After the appearance ot the XH-17 several other manufacturers including Aircraft Omega (Omega BS-12 1956), Mc Donnell (Model 120 1957), Westland (Westland Westminster 1958), or Mil (Mil MI-10 1960), began to show their interest in the concept of the "aerial crane".
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