V.1 Prelimiranary Sizing of Airplanes. V.2 Preliminary configuration design and integration of the propulsion system. V.3 Layout design of cockpit, fuselage, wing and empennage: cutaways and inboard profiles. V.4 Layout design of landing gear and systems. V.5 Component weight estimation. V.6 Preliminary calculation of aerodynamic thrust and power characteristics. V.7 Determination of stability, control and performanca characteristics: FAR and military requirements. V.8 Airplane cost estimation: design development, manufacturing and operating. .
