Accession Number : ADA307082

Title :   Study of the Costs and Benefits of Composite Materials in Advanced Turbofan Engines.

Descriptive Note : Final rept. 27 Jun-27 Dec 73,

Corporate Author : GENERAL ELECTRIC CO CINCINNATI OH AIRCRAFT ENGINE BUSINESS GROUP

Personal Author(s) : Steinhagen, C. A. ; Stotler, C. L. ; Neitzel, R. E.

PDF Url : ADA307082

Report Date : OCT 1974

Pagination or Media Count : 204

Abstract : This program developed composite component designs for a number of applicable engine parts and functions. The cost and weight of each detail component was determined and its effect on the total engine cost to the aircraft manufacturer was ascertained. The economic benefits of engine or nacelle composite or eutectic turbine alloy substitutions was then calculated. Two time periods of engine certification were considered for this investigation, namely 1979 and 1985. Two methods of applying composites to these engines were employed. The first method just considered replacing an existing metal part with a composite part with no other change to the engine. The other method involved major engine redesign so that more efficient composite designs could be employed. Utilization of polymeric composites wherever payoffs were available indicated that a total improvement in DOC of 2.82 to 4.64 percent, depending on the engine considered, could be attained. In addition, the percent fuel saving ranged frcm 1.91 to 3.53 percent. The advantages of using advanced materials in the turbine are more difficult to quantify but could go as high as an improvement in DOC of 2.33 percent and a fuel savings of 2.62 percent. Typically, based on a fleet of one hundred aircraft, a percent savings in DOC represents a savings of four million dollars per year and a percent of fuel savings equals 23000 m3 (7,000,000 gallons) per year.

Descriptors :   *TURBOFAN ENGINES, *COMPOSITE MATERIALS, *COSTS, TIME INTERVALS, AIRCRAFT, AIRCRAFT INDUSTRY, ECONOMICS, ENGINE COMPONENTS, MATERIALS, POLYMERS, EFFICIENCY, ALLOYS, TURBINES, AVIATION FUELS, SUBSTITUTES, BENEFITS, UTILIZATION, NACELLES, EUTECTICS.

Subject Categories : Economics and Cost Analysis
      Laminates and Composite Materials
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE