Methods and apparatus to stabilize and recover unmanned aerial vehicles (UAVs) are disclosed. A disclosed example apparatus includes a capture line, a mast to support the capture line for contact with the UAV, and a braking stabilizer. The braking stabilizer includes a flexible stem, a body at a distal end of the stem, where the body defines first and second flexible posts, and a filament extending between the first and second posts to contact and engage a hook of the UAV.

Capture devices for unmanned aerial vehicles, including track borne capture lines, and associated systems and methods are disclosed. An example system includes a support having an upright portion and a boom portion. The example system further includes a capture line carried by and extending downwardly relative to the boom portion. The capture line has an engagement portion positioned to engage an unmanned aircraft. The example system further includes a flexible landing device positioned to receive the unmanned aircraft in response to the unmanned aircraft engaging the engagement portion.

Capture devices for unmanned aerial vehicles, including track borne capture lines, and associated systems and methods are disclosed. An example system includes a support having an upright portion and a boom portion. The example system further includes a capture line carried by and extending downwardly relative to the boom portion. The capture line has an engagement portion positioned to engage an unmanned aircraft. The example system further includes a flexible landing device positioned to receive the unmanned aircraft in response to the unmanned aircraft engaging the engagement portion.

A control system is described that is connected to an advanced arresting gear system. The control system has: (a) an outer control loop; (b) a first inner control loop associated with a port-side motor current controller for outputting a voltage command for controlling a port side motor that controls a port side of an arrestment cable; (c) a second inner control loop associated with a starboard-side motor current controller outputting a second voltage command for controlling a starboard side motor that controls the starboard side of the arrestment cable. Each of the port-side motor current controller and the starboard-side motor controller comprises: a positive sequence controller, at least one negative sequence controller, one or more delay state feedback to counter control loop delays, wherein the delay state feedback provides high bandwidth, low current overshoot, small current rise time and good current stability margins.

A control system is described that is connected to an advanced arresting gear system. The control system has: (a) an outer control loop; (b) a first inner control loop associated with a port-side motor current controller for outputting a voltage command for controlling a port side motor that controls a port side of an arrestment cable; (c) a second inner control loop associated with a starboard-side motor current controller outputting a second voltage command for controlling a starboard side motor that controls the starboard side of the arrestment cable. Each of the port-side motor current controller and the starboard-side motor controller comprises: a positive sequence controller, at least one negative sequence controller, one or more delay state feedback to counter control loop delays, wherein the delay state feedback provides high bandwidth, low current overshoot, small current rise time and good current stability margins.

Aerial launch and/or recovery for unmanned aircraft, and associated systems and methods. A representative system includes a first, carrier aircraft having an airframe a propulsion system carried by the airframe and positioned to support the carrier aircraft in hover, and a capture line carried by the carrier aircraft and deployable to hang from the carrier aircraft. The capture line is sized to releasably engage with a capture device of a second, carried aircraft. The system further includes a retrieval device positioned to support the carried aircraft for detachment from the capture line.

Aerial launch and/or recovery for unmanned aircraft, and associated systems and methods. A representative system includes a first, carrier aircraft having an airframe a propulsion system carried by the airframe and positioned to support the carrier aircraft in hover, and a capture line carried by the carrier aircraft and deployable to hang from the carrier aircraft. The capture line is sized to releasably engage with a capture device of a second, carried aircraft. The system further includes a retrieval device positioned to support the carried aircraft for detachment from the capture line.

An apparatus for use as part of, or attached to, an unmanned aerial vehicle (UAV) to intercept and entangle a threat unmanned aerial vehicle, includes a flight and payload control system for controlling power to the UAV and for controlling maneuvering of the UAV. A host-side mount may be coupled to the UAV and is in communication with the flight and payload control system. A payload-side mount is removably attached to the host-side mount and includes a power interface and a control interface between the payload-side mount and the host-side mount. A counter-UAV system is coupled to the payload-side mount and includes a deployable chute net having a cross-sectional area sized for intercepting and entangling the threat unmanned aerial vehicle; and a deployment mechanism for mounting to the unmanned aerial vehicle.

An apparatus for use as part of, or attached to, an unmanned aerial vehicle (UAV) to intercept and entangle a threat unmanned aerial vehicle, includes a flight and payload control system for controlling power to the UAV and for controlling maneuvering of the UAV. A host-side mount may be coupled to the UAV and is in communication with the flight and payload control system. A payload-side mount is removably attached to the host-side mount and includes a power interface and a control interface between the payload-side mount and the host-side mount. A counter-UAV system is coupled to the payload-side mount and includes a deployable chute net having a cross-sectional area sized for intercepting and entangling the threat unmanned aerial vehicle; and a deployment mechanism for mounting to the unmanned aerial vehicle.

Capture devices for unmanned aerial vehicles, including track borne capture lines, and associated systems and methods are disclosed. An example system includes a support having an upright portion and a boom portion. The example system further includes a capture line carried by and extending downwardly relative to the boom portion. The capture line has an engagement portion positioned to engage an unmanned aircraft. The example system further includes a flexible landing device positioned to receive the unmanned aircraft in response to the unmanned aircraft engaging the engagement portion.