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    TAIL ROTOR HOUSING
    4.
    发明申请
    TAIL ROTOR HOUSING 审中-公开

    公开(公告)号：US20190308722A1

    公开(公告)日：2019-10-10

    申请号：US15949660

    申请日：2018-04-10

    Applicant: Bell Helicopter Textron Inc.

    Inventor： Dalton T. Hampton ,  Andrew Paul Haldeman ,  Aaron Alexander Acee ,  Matthew John Hill

    IPC: B64C27/82 ,  B64C27/06

    Abstract: Systems and methods include providing an aircraft with a tail rotor system having a tail rotor housing that forms a cambered airfoil between an upper cambered surface and an lower cambered surface of the tail rotor housing. The cambered airfoil design of the tail rotor housing is capable of providing sufficient lifting force of an aircraft to offload the tail rotor during forward flight, thereby eliminating the need for a traditional vertical stabilizer or fin. The tail rotor blades of the tail rotor system are disposed within an aperture in the tail rotor housing, which minimizes or preferably eliminates exposure of the tail rotor blades to edgewise airflow typically encountered during forward flight, thereby allowing rigid rotor hubs, both in-plane and out-of-plane, to be used in the tail rotor system while also reducing noise output of the tail rotor system.

    METHODS FOR FORMING ROTOR BLADES HAVING FOAM CORES
    7.
    发明申请
    METHODS FOR FORMING ROTOR BLADES HAVING FOAM CORES 审中-公开

    公开(公告)号：US20200094450A1

    公开(公告)日：2020-03-26

    申请号：US16141127

    申请日：2018-09-25

    Applicant: Bell Helicopter Textron Inc.

    Inventor： James A. Cordell ,  Suvankar Mishra ,  Andrew Paul Haldeman ,  Jesse J. Wrabel ,  Dalton T. Hampton

    IPC: B29C44/18 ,  B64C11/26 ,  B29C44/34 ,  B29C44/42 ,  B29C44/60

    Abstract: A method is provided in one example embodiment and may include positioning at least one nozzle within a hollow portion of a rotor blade at a distance associated with a span of the rotor blade and providing, via the at least one nozzle, a liquid foam mixture in the hollow portion, wherein the liquid foam expands and becomes a solid foam material that fills the hollow portion of the rotor blade. Another method is provided in another example embodiment and may include providing a plurality of openings for a rotor blade that are positioned proximate to a hollow portion of the rotor blade and providing a liquid foam mixture in the hollow portion of the rotor blade through at least one opening of the rotor blade, wherein the liquid foam mixture expands and becomes a solid foam material that fills the hollow portion of the rotor blade.

    Articulated Rotor Systems with Blade-to-Blade Damping
    8.
    发明申请
    Articulated Rotor Systems with Blade-to-Blade Damping 审中-公开

    公开(公告)号：US20190322363A1

    公开(公告)日：2019-10-24

    申请号：US15961713

    申请日：2018-04-24

    Applicant: Bell Helicopter Textron Inc.

    Inventor： Andrew Paul Haldeman ,  Dalton T. Hampton ,  Frank Bradley Stamps

    IPC: B64C27/51 ,  B64C27/48

    Abstract: A rotor system includes a yoke, a plurality of blade grip assemblies and a plurality of centrifugal force bearings coupling the blade grip assemblies with the yoke. A plurality of rotor blades are coupled to the blade grip assemblies such that each rotor blade has a coincident hinge and such that each rotor blade has three independent degrees of freedom including blade pitch about a pitch change axis, blade flap about a flapping axis and lead-lag about a lead-lag axis. A blade-to-blade damping ring includes a plurality of damper anchors each coupled to one of the blade grip assemblies along the respective pitch change axis and a plurality of lead-lag dampers each coupled between adjacent damper anchors. During blade pitch operations, each blade grip assembly is operable to rotate relative to the respective damper anchor, such that the blade-to-blade damping ring is operable to provide pitch independent lead-lag damping.

    Tail rotor housing
    10.
    发明授权
    Tail rotor housing 有权

    公开(公告)号：US10814971B2

    公开(公告)日：2020-10-27

    申请号：US15949660

    申请日：2018-04-10

    Applicant: Bell Helicopter Textron Inc.

    Inventor： Dalton T. Hampton ,  Andrew Paul Haldeman ,  Aaron Alexander Acee ,  Matthew John Hill

    IPC: B64C27/82 ,  B64C27/06

    Abstract: Systems and methods include providing an aircraft with a tail rotor system having a tail rotor housing that forms a cambered airfoil between an upper cambered surface and a lower cambered surface of the tail rotor housing. The cambered airfoil design of the tail rotor housing is capable of providing sufficient lifting force of an aircraft to offload the tail rotor during forward flight, thereby eliminating the need for a traditional vertical stabilizer or fin. The tail rotor blades of the tail rotor system are disposed within an aperture in the tail rotor housing, which minimizes or preferably eliminates exposure of the tail rotor blades to edgewise airflow typically encountered during forward flight, thereby allowing rigid rotor hubs, both in-plane and out-of-plane, to be used in the tail rotor system while also reducing noise output of the tail rotor system.

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