Piasecki PA-97 Heavy Lift Helistat . Piasecki Aircraft Corp . Black Marker / Vellum. 24" x 24"
... conceptual sketch for an integrated heavy lift aircraft platform, proposed for logging and transport of cumbersome materials over difficult terrain. The demonstration airship consisted of four Sikorsky H-34 helicopters arranged symmetrically, at the corners of a truss frame, under a large, balloon type, aerostat. Called the Piasecki PA-97 "Helistat", one prototype was built and tested at Lakehurst, New Jersey in 1986. Although the concept seemed sound, engineering wasn't up to the task. Things did not go well during trials and the project was suspended.