[2] The structure throughout was metal and composite materials,[2] with Tervamäki specifically drawing attention in one of his articles about the aircraft that no wood was used in any part of it.
[4] On Tervamäki's and Eerola's prototype, the forward fuselage was partially enclosed in a fibreglass pod, which was salvaged from a Fibera KK-1e Utu sailplane, along with the windscreen, pilot's seat, and instrument panel.
[6] Within the computer model, the designers were able to vary parameters that included the diameter, chord, and airfoil of the rotor, the pitch, twist, and taper of the blades, plus overall characteristics such as the parasite drag of the fuselage, the gross weight of the aircraft, and the power of the engine.
[6] When the aircraft flew, Tervamäki and Eerola discovered that the computer models had been too optimistic, because they were based on drag values that were not attained in real life.
[7] The shape of the original fin and rudder were inspired by the looks of the Wallis WA-116 autogyro that had featured in the recent James Bond film You Only Live Twice.
[3] The V-tail that was fitted to the aircraft was chosen to maximise longitudinal stability after Tervamäki and Eerola were asked to help the Finnish aviation authorities investigate the fatal crash of a Bensen B-8M at Pori.
[11] They chose a V-tail to give the aircraft the largest practical tail surfaces while still preserving sufficient clearance for the main rotor.