A small-scale tiltrotor model was tested in the 7- by 10-Foot Wind Tunnel at NASA Ames Research Center with the goal of further investigating the aerodynamic environment of a tiltrotor operating in the Vortex Ring State (VRS). Test objectives were to obtain performance data of a 3-bladed tiltrotor model over a range of descent and sideslip conditions and to compare mean thrust results with a previously reported 2-bladed tiltrotor model investigation. Three sets of rotor blades, twisted and untwisted, were tested in a dual rotor configuration. Results of this investigation are presented, showing mean thrust reductions, a reduction in the effective lift curve slope and an increase in required collective pitch in the region of VRS. There was no consistent trend between the 2-bladed and 3-bladed untwisted blade sets or the two sets of twisted blades. Sideslip did not appear to significantly effect mean vehicle thrust.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Small-Scale Tiltrotor Model Operating in Descending Flight


    Contributors:
    A. I. Abrego (author) / M. D. Betzina (author) / K. R. Long (author)

    Publication date :

    2002


    Size :

    9 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    A Small-Scale Tiltrotor Model Operating in Descending Flight

    Abrego, Anita I. / Betzina, Mark D. / Long, Kurtis R. | NTRS | 2002


    A Wind Tunnel Investigation of a Small Scale Tiltrotor Model in Descending Flight

    Abrego, Anita I. / Long, Kurtis R. / Rutkowski, Michael | NTRS | 2001


    Descending Flight Simulation of Tiltrotor Aircraft at Different Descent Rates

    Takii, Ayato / Yamakawa, Masashi / Asao, Shinichi | British Library Conference Proceedings | 2020


    Adaptive model inversion flight control for tiltrotor aircraft

    Rysdyk, R.T. / Calise, A.J. | Tema Archive | 1998


    Adaptive model inversion flight control for tiltrotor aircraft

    Calise, Anthony / Rysdyk, Rolf | AIAA | 1997