Intel says it's the Piasecki PA-97 Helistat (U.S. Navy and U.S. Forest Service 1986), a $40 million experimental heavy-lift aircraft, built by Frank Piasecki by fastening four obsolete Sikorsky H-34J helicopters to a framework beneath a ZPG-2W helium blimp...
Designed to lift 26 tons, flight tests proved it to be so unstable as to be uncontrollable. It crashed at Lakehust, New Jersey in July 1986, killing one of the pilots.
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