Abstract: A rigging arrangement and yarder are disclosed for yarding in which a single cable is used. This cable is anchored at a main storage drum on a yarder and preferably at an anchor in the vicinity of the tail block. The single line serves as a running skyline for supporting a carriage and includes several loops around a tram drum and an idler drum (but only one layer on said drums) which operate to hold cable or to reel equal amounts of cable in or out to both the yarder side and the anchor side of the carriage to move the carriage without introducing slack into either side. Since only a single layer of cable is wound on the tram and idler drums, no energy is lost dealing with varying speeds and torques caused by changing effective diameters, thus saving energy and weight of equipment.

Abstract: An air lifting vehicle includes, inter alia, a main frame containing an engine, a helicopter-type rotor driven by the engine, a rear located propeller which provides torque compensation for the rotor as well as yaw control for the vehicle, and a pilot's cabin. Attached to the frame through a plurality of outwardly extending truss members is a keel structure which includes a circular truss section essentially coaxial with and positioned above the rotor and other generally triangular or rounded triangular truss sections attached fore and aft of the circular truss section. Balloon members including fore and aft generally triangular Forlanini envelope sections are secured to the keel and laced together at the center to define a circular opening or duct above the rotor. A pair of forward thrusting propellers are driven by an auxiliary engine carried in the frame and are gimbaled in the elevational plane for pitch control of the vehicle.

Abstract: An anchor-deploying structure and method particularly adapted for anchoring an offshore drilling platform employs the use of an anchor, anchor chain and wire rope combination. Separate reeling and storage means are supplied for the wire rope and anchor chain, the wire rope being carried on and deployed from a winch-driven drum and the chain being carried in a chain locker and deployed from and returned to the chain locker by a chain hoist. At the end of the wire rope is a connector which carries a short length of leader chain which may include a swivel. A work station is so located that workmen thereon have access to both the leader chain and a length of lead chain from the chain locker, either of which may be connected to the anchor chain through the use of a special three-way chain link and a pair of removable links.