Enstrom homebuilt helicopter of 1957


This is the earliest known photo of Rudy Enstrom testing one of his homebuilt helicopters in a quarry in the Upper Peninsula town of Crystal Falls, Mich. This shows his third attempt in the winter of 1957. Rudy was an iron mine mechanic with little knowledge of helicopter design, but he was able to patent three designs that were used to design the aircraft pictured above.