Maintaining attitude control of unmanned aerial vehicles by varying centers of gravity

    公开(公告)号:US11230371B2

    公开(公告)日:2022-01-25

    申请号:US16992074

    申请日:2020-08-12

    Abstract: Aerial vehicles may be configured to control their attitudes by changing one or more physical attributes. For example, an aerial vehicle may be outfitted with propulsion motors having repositionable mounts by which the motors may be rotated about one or more axes, in order to redirect forces generated by the motors during operation. An aerial vehicle may also be outfitted with one or more other movable objects such as landing gear, antenna and/or engaged payloads, and one or more of such objects may be translated in one or more directions in order to adjust a center of gravity of the aerial vehicle. By varying angles by which forces are supplied to the aerial vehicle, or locations of the center of gravity of the aerial vehicle, a desired attitude of the aerial vehicle may be maintained irrespective of velocity, altitude and/or forces of thrust, lift, weight or drag acting upon the aerial vehicle.

    Independently rotatable propeller blade mounts

    公开(公告)号:US10669869B1

    公开(公告)日:2020-06-02

    申请号:US15600252

    申请日:2017-05-19

    Abstract: Aerial vehicles may be equipped with propellers having pivotable blades that are configured to rotate or fold when the propellers are not rotating under power. A pivotable blade may rotate about an axis of a propeller with respect to a hub in the presence of wind flow until the pivotable blade is coaligned with a fixed blade, in a direction opposite to the wind flow. A pivotable blade may also fold over a hub of a propeller in the presence of wind flow, with the pivotable blade and a fixed blade being oriented in directions opposite to the wind flow. A center of mass of the pivotable blade may be caused to be on the same side of an axis as a center of mass of a fixed blade, even where the axis is not normal to the wind flow, thereby reducing an amount of drag generated by the propeller.

    Multi-chamber packaging devices
    79.
    发明授权

    公开(公告)号:US10370168B1

    公开(公告)日:2019-08-06

    申请号:US15193882

    申请日:2016-06-27

    Abstract: A multi-chamber device is described. The device can include a first chamber and a second chamber disposed within the first chamber. Each chamber may be formed from a flexible material. A first tube may extend between the first chamber and outside the first chamber to enable addition of gas to the first chamber. A second tube may extend between the second chamber and outside the first chamber to enable removal of gas from the second chamber.

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