This is slightly off track but.....
My very first ride in a helicopter was in a Piaseki HRP-1 the original flying banana. The engine was in the rear of the passenger compartment completely exposed (a mechanics’ dream) along with the fuel bladder. I was sitting near the combining gearbox when the pilot put the helicopter into autorotation and the helicopter did not have a freewheeling unit. Instead it had a spring-loaded jaw clutch which sounded like a machine gun going off. It scared the hell out of us that were not familiar with the HRP-1.
