PROSPECTS FOR ENERGY CONSERVING STOL TRANSPORTS USING PROP-FANS

This paper describes results from recent studies funded by the Canadian Transportation Development Agency on the application of the Prop-fan type of advanced propeller to future civil STOL transport aircraft. Aircraft were designed for cruise Mach numbers of 0.50, 0.60 and 0.70, assuming new technology in aerodynamics, propulsion and structures expected to be available by the mid 1980's. These aircraft were compared with equivalent turboprop powered STOL aircraft based on current technology that cruised at slower speeds (Mach 0.38) and met the same mission requirements. It was found that design cruise Mach number had a strong influence on the fuel savings achieved by the Prop-Fan aircraft. Relative to the current technology aircraft, the fuel savings were about 45%, 30% and 10% for the aircraft cruising at Mach 0.50, 0.60 and 0. 70 respectively. The direct operating costs of the Prop-Fan aircraft designed for Mach 0.50 and 0.60 cruise speed were very similar to current technology aircraft up to the design range with maximum payload (345 st. m1. ). Beyond this distance, the superior specific air range of these aircraft enabled greater payloads to be carried out and direct operating costs (DOCs) to be improved. The Mach 0.70 cruise speed showed substantial penalties in DOC at all ranges (about 18% at 600 st. m1. ), due to its increased size, higher first costs and greater maintenance costs. Based on the results of these studies and the many gaps found in existing aerodynamic design data, several items of research and development (R&D) were identified which should be investigated if the Prop-Fan concept is to be exploited in future STOL transport aircraft.

  • Corporate Authors:

    Canadian Aeronautics and Space Institute

    77 Metcalfe Street
    Ottawa 4, ONo,   Canada 
  • Authors:
    • Eggleston, B
  • Publication Date: 1978-7

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Filing Info

  • Accession Number: 00188575
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Mar 14 1979 12:00AM