Abstract: A spar-end boom fitting, comprising a first and a second boom receiving member each having a boom receiving bore therein and each being joined by a connecting member with the connecting member forming with the boom receiving members a spar-receiving indentation and having a first and a second lashing line passage therethrough, and a jam cleat formed radially along the outer circumference of one of the boom receiving members, including a groove, having a pair of opposed rows of teeth. In addition it is disclosed that the boom receiving members have a plurality of parallel radially outward extending ribs and an interconnecting longitudinally outward extending spine and the groove is formed between a pair of the ribs. Further the disclosure includes the spar receiving indentation being covered with a resilient foam material which will conform to the shape of the spar. Still further, the disclosure includes an up-haul line locking mechanism formed in the connecting member.

Abstract: A base for the spar, i.e., mast, of a wind-propelled vehicle useful for attaching the spar, i.e., mast, to the universal joint which universal joint is further attached to the wind-propelled vehicle. The base has a cylindrical bore for receiving the spar, i.e., mast, in the upper portion thereof and the lower portion has an axially-located bore for the passage of a bolt which connects the lower end of the spar, i.e., mast, to a portion of the universal joint, and two line passages extending through the lower portion generally perpendicular to the longitudinal axis of the base, each having a pair of upper surfaces which slant inwardly downward towards the center of the passage and define a pair of grooves in the lower portion, with one of the grooves on one of the passages having a plurality of teeth on the opposed side walls thereof which grip and hold a line, acting as a jam cleat.

Abstract: Wind-propelled apparatus in which a mast is universally mounted on a craft and supports a boom and sail. Specifically a pair of curved booms are arcuately connected athwart the mast and secure the sail therebetween, the position of the mast and sail being controllable by the user but being substantially free from pivotal restraint in the absence of such control.