in 1965, the filper corporation acquired rights to the copperfield corporation as well as the gyroflex system, providing orr with stable funding to continue development of the concept. orr continued his work with j. ford johnston as chief engineer, j. eric rhodes, chief project engineer, and irv culver and john turner as assistants. the filper helicopter (n9712c) was developed as a proof-of-concept testbed that led to the filper beta 100a, a tandem rotor design with a two-seat cabin and pylon at the rear, and the engine with the forward pylon in front. this unique arrangement resulted in the pilot and passenger being located at the rear of the helicopter. the fuselage was highly streamlined and the addition of retractable tricycle landing gear allowed for a low drag design.