Abstract: Unmanned aerial vehicle (UAV) recovery is disclosed. An example apparatus to recover an unmanned aerial vehicle (UAV) includes a support rail to support a cable. The apparatus also includes a pivot arm to rotate about a pivot, where the cable is suspended between the support rail and the pivot arm, and where the pivot arm is rotated to a first orientation when the UAV contacts the cable and rotated to a second orientation when the UAV is brought to a stop. The apparatus also includes at least one of a friction device or a damper operatively coupled to the cable to resist motion of the cable during rotation of the pivot arm from the first orientation to the second orientation.

Abstract: Unmanned aerial vehicle (UAV) recovery is disclosed. An example apparatus to recover an unmanned aerial vehicle (UAV) includes a support rail to support a cable. The apparatus also includes a pivot arm to rotate about a pivot, where the cable is suspended between the support rail and the pivot arm, and where the pivot arm is rotated to a first orientation when the UAV contacts the cable and rotated to a second orientation when the UAV is brought to a stop. The apparatus also includes at least one of a friction device or a damper operatively coupled to the cable to resist motion of the cable during rotation of the pivot arm from the first orientation to the second orientation.

Abstract: A balanced rotor comprising a circumferential slot and a plurality of aerofoils each secured in the slot by a respective root, the root having a root block having circumferentially facing flanks and a seal wing extending circumferentially from one of the flanks, characterized in that the seal wing has a notch engaging a balance weight positioned between adjacent roots.

Abstract: A drain assembly for above ground flexible waterproof swimming pool covers compressed of rigid plastic material, thereby installed in the prescribed matter defining a clear passageway which will allow for the free flow of standing water and particulate matter from the exterior surface of the above ground flexible waterproof swimming pool cover to the exterior periphery of the above ground swimming pool.

Abstract: A cutout fuse tube assembly installation tool includes a body member having first and second ends. A longitudinal axis passes through the body member. A protrusion extends outward from the first end of the body member and includes a head end spaced apart from the body member. The second end of the body member includes a bracket that has first and second arms spaced apart by an opening. A bracket axis passes through the opening. The bracket, the bracket axis and the protrusion are configured such that the bracket axis passes between the head end of the protrusion and the body member. A movable gate device is mounted on one or both of the first and second arms. The gate device facilitates opening and closing of an access to the opening through the ends of the first and second arms.

Abstract: A regulator neutral detector comprises a pair of probes for engaging the source conductor and the load conductor, respectively, of an electrical utility voltage regulator and a digital voltmeter for indicating the difference between voltages applied to said probes.

Abstract: A digital, high-voltage meter device is comprised of two poles, each having a probe connected to high-voltage resistors. The resistors are connected to supply low-voltage inputs to a digital voltmeter. In a modification, one of the poles including its probe and high-voltage resistor, is replaced by a connector, such as an alligator clip, adapted to be releasably connected to system ground.

Abstract: A voltage detector/indicator unit includes a plurality of lights for indicating a voltage within one of a plurality of different voltage ranges by lighting the lights in a selected pattern.

Abstract: A simplified, impulse-type pulling and installing tool for appliances such as electrical connector elbows is provided which in use generates a sharp impact force to facilitate quick, safe elbow manipulation even under electrical load, thereby reducing the probability of flashover. In preferred forms, the tool includes an elongated rod having workpiece-engaging apparatus adjacent one end thereof, with tubular hammer means telescoped over the rod and reciprocably slidable along a portion of the length thereof. The hammer includes structure defining a pair of hammering surfaces respectively located adjacent the opposed ends of the hammer, and the rod is moreover provided with anvil means secured thereto and oriented for engagement by the hammering surfaces when the hammer is slid along the rod. A pair of such hammering surfaces are provided, which are cooperatively oriented relative to the hammering means, so that fore and aft impact forces can be developed along the length of the rod as desired.