The design and performance of compound helicopters utilizing lift-offset rotors are examined, in the context of short-haul, medium-size civil and military missions. The analysis tools used are the comprehensive analysis CAMRAD II and the sizing code NDARC. Following correlation of the comprehensive analysis with existing lift-offset aircraft flight test data, the rotor performance model for the sizing code was developed, and an initial estimate was made of the rotor size and key hover and cruise flight conditions. The rotor planform and twist were optimized for those conditions, and the sizing code rotor performance model updated. Two models for estimating the blade and hub weight of lift-offset rotors are discussed. The civil and military missions are described, along with the aircraft design assumptions. The aircraft are sized for 30 passengers or 6600 lb payload, with a range of 300 nm. Civil and military aircraft designs are described for each of the rotor weight models. Disk loading and blade loading were varied to optimize the designs, based on gross weight and fuel burn. The influence of technology is shown, in terms of rotor hub drag and rotor weight.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Design and Performance of Lift-Offset Rotorcraft for Short-Haul Missions


    Beteiligte:
    W. Johnson (Autor:in) / A. M. Moodie (Autor:in) / H. Yeo (Autor:in)

    Erscheinungsdatum :

    2012


    Format / Umfang :

    26 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Design and Performance of Lift-Offset Rotorcraft for Short-Haul Missions

    Johnson, Wayne / Moodie, Alex M. / Yeo, Hyeonsoo | NTRS | 2012




    Influence of Lift Offset on Rotorcraft Performance

    Johnson, W. / AHS international | British Library Conference Proceedings | 2008