Hiller air tug heavy helicopter 3D model
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Company hopes for giant tip-powered helicopters revived briefly in 1965 when the National Aeronautics and Space Administration considered sponsoring a Hiller flying crane to recover Saturn V moon booster first stages during Project Apollo. Aerial recovery of this spent first stage, which weighed up to 400 tons, dictated that the Hiller/NASA recovery vehicle be the largest aircraft of any kind yet proposed. The resulting design featured a gross weight of about a 450t and a rotor more than 100m in diameter. Powered by two or more jet engines per blade, this rotor would have turned at 60 rpm, presenting the illusion of slow motion to observers below.
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