AN AIR FREIGHTER PROJECT FOR 1975

Within a decade, the revenue from the air cargo sector of civil aviation is expected to exceed that for passenger transportation. This cargo market growth therefore offers challenging problems in systems design and analysis which include airplanes containerization and ground handling facilities. Uncompromised cargo airplanes will be needed, i.e. not modified military or passenger vehicles. A subsonic all-cargo airline with a cruising speed of Mach 0.85 to carry a payload of 500,000 pounds over a range of 3,000 statute miles, was therefore selected as a project at Stanford University. This paper describes this systems design process and summarizes results of the analysis. A cargo density of 10 lb/ft3 dictated the accomodation of 40 lightweight intermodal containers of size 8 ft x 8 ft x 20 ft. This airplane of 1,400,000 lbs. gross weight has six 50,000 lb. thrust high bypass engines. The predicted use of advanced composite materials will provide a thrust-to-weight ratio of 7.5 to 1. Aeroelastic and maintenance considerations favored wing-mounted engine locations. Further, a high-wing location was chosen. An all-flying T-mounted stabilizer providing reduced wetted area and avoidance of wing wake. A wing of 35 degrees sweep and an aspect ratio of 12 gave high aerodynamic efficiency. This aspect ratio was made possible by advanced composite fiber-reinforced plastic matrix materials providing low weight and improved fatigue life over conventional metallic materials. The impact of recent transonic or "peaky" airfoil developments was also recognized. Blown leading and trailing edge flaps permit operation from 6,000 ft runways and vastly simplify control mechanisms, surfaces and thus reduce structure weight.

  • Corporate Authors:

    Stanford University

    Stanford, CA  USA  94305
  • Authors:
    • Douglas, A
    • Linder, D
    • Okazaki, A
    • Sorensen, J
    • Spaght, P
    • STEEL, J
  • Publication Date: 1968-5-6

Subject/Index Terms

Filing Info

  • Accession Number: 00073164
  • Record Type: Publication
  • Source Agency: FLIGHT TRANSPORTATION LABORATORY, MIT DEPT. OF AERONAUTICS AND ASTRONAUTICS
  • Report/Paper Numbers: SUDAAR 346
  • Files: TRIS
  • Created Date: Sep 5 1974 12:00AM