ADVANCED PROPULSION SYSTEMS FOR LARGE SUBSONIC TRANSPORTS

This paper examines the parameters that influence the design of new engines for large transport aircraft. The search for the lowest installed specific fuel consumption has produced a variety of proposals under the label of Ultra-High Bypass engines. A number of these designs are examined and the factors controlling their installed performance are reviewed. Weight and cost effects are also considered. The technology necessary to achieve a competitive product is identified. This technology is then related to the current new engine proposals that are largely derivative with little change in bypass ratio from current products.