A convenient aerodynamic index of the energy cost of turning an aircraft is the energy required to overcome its air resistance per unit mass per turn, and it is termed specific energy of turn (SET). This index and the engine characteristics determine the fuel requirements. Evidently, reduction of SET at the design stage could lead to an increase in the range, or a reduction in the aircraft weight. This paper developes the analytical basis for SET and discusses a suitable representation of the drag polar. Analytical relations for minimum SET are subsequently obtained, and turn performance is then discussed in terms of SET-turn-rate characteristics. An illustrative example is given to show how the characteristics can be conveniently used in a parametric study.

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  • Corporate Authors:

    American Institute of Aeronautics and Astronautics

    1290 Avenue of the Americas
    New York, NY  United States  10019
  • Authors:
    • Yajnik, K S
  • Publication Date: 1977-5

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Filing Info

  • Accession Number: 00172726
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Mar 14 1978 12:00AM