Back when i was doing government security I had the pleasure of meeting Frank Piasecki on a number occasions. He was aviation genius, he always wore red suspenders. Going into his company was like going back in time to an old design bureau where everything was on drafting boards with pencils. I remember one of his projects was taking four surplus H-34 helicopters and attaching them to a non-rigid balloon for develop a heavy lift "helicopter". I remember it crashing at Lakehurst NAS during one of the test not far from where the Hindenberg crashed and exploded.