A joint U.S. Army/NASA flight investigation was conducted utilizing a single-rotor helicopter to determine the effectiveness of horizontally mounted tail boom strakes on directional controllability and tail rotor power during low-speed, crosswind operating conditions. Three configurations were investigated: (1) baseline (strakes off), (2) single strake (strake at upper shoulder on port side of boom), and (3) double strake (upper strake plus a lower strake on same side of boom). The strakes were employed as a means to separate airflow over the tail boom and change fuselage yawing moments in a direction to improve the yaw control margin and reduce tail rotor power. Crosswind data were obtained in 5-knot increments of airspeed from 0 to 35 knots and in 30 deg increments of wind azimuth from 0 deg to 330 deg. At the most critical wind azimuth and airspeed in terms of tail rotor power, the strakes improved the pedal margin by 6 percent of total travel and reduced tail rotor power required by 17 percent. The increase in yaw control and reduction in tail rotor power offered by the strakes can expand the helicopter operating envelope in terms of gross weight and altitude capability. The strakes did not affect the flying qualities of the vehicle at airspeeds between 35 and 100 knots.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Flight investigation of the effect of tail boom strakes on helicopter directional control


    Beteiligte:

    Erscheinungsdatum :

    1993-02-01


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Flight Investigation of the Effect of Tail Boom Strakes on Helicopter Directional Control

    H. L. Kelly / C. A. Crowell / K. R. Yenni et al. | NTIS | 1993


    Flight investigation of the effect of tail boom strakes on helicopter directional control

    Kelley, Henry L. / Crowell, Cynthia A. / Yenni, Kenneth R. et al. | NTRS | 1990


    Helicopter Tail-Boom Strakes

    Kelley, H. L. / Phelps, A. E., III / Wilson, J. C. | NTRS | 1986


    Further Research On Helicopter Tail-Boom Strakes

    Kelley, Henry L. / Crowell, Cynthia A. / Yenni, Kenneth R. et al. | NTRS | 1994