Wind-tunnel evaluation of a 21-percent-scale powered model of a prototype advanced scout helicopter (English Edition)

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An exploratory wind Charnier culture of a 21 percent scale powered model of a édifiant advanced boy-scout helicopter was conducted in the Langley 4 by 7 Meter Charnier. The culture was conducted to define the overall aerodynamic characteristics of the Army Helicopter Improvement Program (AHIP), to determine the effects of the rotor on the aerodynamic characteristics and to evaluate the effect of a mast mounted sight on the aircraft stability characteristics. Tests covered a range of thrust coefficients, advance ratios, angles of attack and angles of sideslip and were run for both rotor on and rotor off configurations. Results of the culture showed that the édifiant physionomie was longitudinally unstable with renfoncement of attack for all configurations tested. The instability was due to unfavorable interference effects between the oblique tail and the wake shed from the engine pylon and rotor hub, which caused a loss of oblique tail effectiveness. The complément of the mast mounted sight had little effect on the stability of the model, but it caused an alteration in the rotor lift mercatique that resulted in substantial interference drag for the sight. Phelps, A. E., III and Berry, J. D. Langley Research Center NASA-TP-2420, L-15895, NAS 1.60:2420, AVSCOM-TR-85-B-2, AD-A157115 DA PROJ. 1L1-62209-AH76; RTOP 505-45-43-02 AERODYNAMIC CHARACTERISTICS; HELICOPTER PERFORMANCE; P-531 HELICOPTER; SCALE MODELS; WIND TUNNEL TESTS; AERODYNAMIC CONFIGURATIONS; AERODYNAMIC INTERFERENCE; AIRCRAFT STABILITY; ANGLE OF ATTACK; ROTORS; SIDESLIP; TAIL ASSEMBLIES; THRUST

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