A Model for Evaluating VSTOL Versus CTOL Combat Aircraft Systems

This paper describes a cost-effectiveness study of the use of vertical or short takeoff and landing (VSTOL) aircraft for combat missions. A comparison is made with conventional (CTOL) aircraft as tactical fighters in a future NATO environment. The conditions under which VSTOL and CTOL aircraft can be considered to be competitive systems are carefully described. A model yielding the “probability of completing n successive missions” is used as a measure of combat effectiveness. A cost model was constructed to reflect the resource impact of the same variables or alternatives that affect the measure of effectiveness. This integrated format is a necessary condition for the selection of least-cost designs capable of providing a given level of mission performance. A graphical summary of such a format is provided.