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The luff of the sail is bound to the mast, but unlike the gaff rig where the head is bound to a spar, this rig supports the leech of the sail by means of a diagonal spar or spars named a sprit (/ s p r iː t /). [3] The forward end of the sprit spar is attached to the mast, with the after end of the sprit spar attached to the peak.
A spar is a pole of wood, metal or lightweight materials such as carbon fibre used in the rigging of a sailing vessel to carry or support its sail. These include yards , booms , and masts , which serve both to deploy sail and resist compressive and bending forces, as well as the bowsprit and spinnaker pole .
Diagonal lashing is a type of lashing used to bind spars or poles together, to prevent racking. It gets its name from the fact that the wrapping turns cross the poles diagonally and is used to spring poles together where they do not touch as in the X-brace of a trestle.
Spritsail rig features a four-sided mainsail with the aft upper corner supported by a diagonal spar, called a sprit, whose lower end meets the mast near the foot of the sail. Lateen rig features a three-sided sail set on a long yard, mounted at an angle on the mast and running in a fore-and-aft direction.
The central third of the span is a rectangular panel, within which a diagonal sub spar runs rearwards from the main spar, with additional ply covering ahead of it. Originally there were no control surfaces on this inner panel, though in 1941 airbrakes were added across the junction between inner and outer panels, mounted behind the main spar.
Sail components include the features that define a sail's shape and function, plus its constituent parts from which it is manufactured. A sail may be classified in a variety of ways, including by its orientation to the vessel (e.g. fore-and-aft) and its shape, (e.g. (a)symmetrical, triangular, quadrilateral, etc.).
Built around a single spar, the wing was also strongly straight tapered in plan, with a taper ratio of 0.18. Near the roots the wing was plywood covered forward of a diagonal sub-spar; further out the ply covering ran around the leading edge from the main spar forming a D-shaped torsion box.
The wing was built around a single spar with plywood skin from it forward around the leading edge forming a torsion resistant box. On the centre section the ply skin extended rearwards to diagonal auxiliary spars and on the lower surface of the outer panels to the aileron hinge.