Four Choppers and a Blimp: The Bizarre Piasecki Helistat

The story of the PA-97 Helistat is indeed a fascinating and somewhat bizarre chapter in aviation history. Here's a summary of its key points:

1. Concept and Origins:

   • The idea was proposed by Piasecki Aircraft Corporation as a solution for heavy-lift operations, particularly for logging in remote mountainous areas where traditional ground-based transportation methods were impractical.
   • It drew inspiration from earlier concepts that combined the lift capability of airships with the maneuverability of helicopters.

2. Design and Components:

   • The Helistat used an ex-US Navy ZPG-2W blimp's gas bag, which had a volume of 1 million cubic feet (28,317 cubic meters) for aerostatic lift.
   • Four retired Sikorski H-34J helicopters were attached to the airframe to provide dynamic lift and propulsion.

3. Development Challenges:

   • The project was commissioned by the US Forest Service in 1979 with an initial budget of $25 million, but costs escalated to over $100 million by its conclusion in 1986.
   • Despite optimistic projections, the Helistat struggled to

Read the full article at Hackaday

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