Abstract: A remote control drone assembly to assist in the rescue of distressed swimmers. The drone assembly includes a flotation device that can be released over a distressed swimmer. A retractable spool assembly attached to the drone assembly includes a line having a proximate end tethered to the spool assembly. The drone assembly is constructed and arranged to be flown by an operator over a distressed swimmer. The floatation device is released for use by the distressed swimmer and the drone assembly is returned to the operator. The retractable spool is detached from the drone assembly and attached to a spool retractor. The spool retractor retrieving the floatation device together with the distressed swimmer.

Abstract: A battery powered octocopter drone with a protective frame. An articulating arm is mounted to the drone with a battery powered chain saw positioned along the end of the articulating arm. The chainsaw allows for the trimming of remote trees and bushes previously only accessible by a ladder or bucket lift. The drone is adjustable forward/aft to compensate for the center of gravity. The drone includes a remote control receiver, telemetry and an antenna allowing an operator to control all aspects of the drone from a remote position.

Abstract: The invention is directed to a propeller hubcap and method for installing a propeller hubcap which includes attaching a propeller hubcap to main propeller where the main propeller has at least two blades and a shaft and where the shaft has a diameter of from 2.5 inches to 6 inches. The propeller hubcap includes a central body and propeller blades, where the propeller blades are timed with the blades of the main propeller. A thick and thin nut are provided on the main propeller shaft where the thick or thin nut which is positioned further from the main propeller is tapped by multiple holes which have received a fastener. The fasteners attach the propeller hubcap to the main propeller shaft via complementary holes in the central body of the propeller hubcap.

Abstract: A detector comprises a radio-frequency, RF, transmit antenna; a RF receive antenna; and a cable avoidance tool, CAT, antenna.