22nd Congress of International Council of the Aeronautical Sciences, Harrogate, UK, 28 August - 1st September, 2000
Paper ICAS 2000-1.2.3

PROPELLER AIRFRAME AERODYNAMIC INTERFERENCE ON TWIN ENGINE AIRCRAFT

S. G. Derishev
SibNIA, Russia

Keywords: twin engine aircraft, propeller, aerodynamic interference, engine positioning, aerodynamic perfection, thrust, power, propeller efficiency, lift, drag, longitudinal stability.

Rational integration of the propulsion system– airframe allows quite obviously improve the full economizing of propeller aircraft and to arise safety of the take-off and landing modes. The article presents the series of experimental results, got during the low-speed wind tunnel testing of some typical configurations of twin engine aircraft. It’s shown here quite substantial airframe influence on effectiveness and normal force of air propellers and also influence of propellers streams on lift, drag and longitudinal static stability. On the basis of got data indexes of aerodynamic perfection for examined configurations of twin engine aircraft have been determined. The most potential flight range may be realized with the traditional configuration with engines on the wing and pulling propellers. The best take-off and landing performances are achieved while engines were installed on pylons at the tail of the fuselage.

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