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 was sound, things did not go well during trials and the project was suspended.