'' ships in
Sulawesi with furled and unfurled tanja sails '' from
Halmahera,
Maluku Islands (c. 1920) with a tanja sail Tanja sail can be distinguished by its canted/oblique design. The sail face is
asymmetrical in shape and most of the area is elongated to the sides, rather than upward like those of
lug sail. Tanja sails were rigged similarly to crab claw sails and also had spars on both the head and the foot of the sails; but they were square or rectangular with the spars not converging into a point. The masts have curved heads with grooves for attaching the
halyards. The lower part of two of the bamboo poles of the mast assembly have holes that are aligned and slotted across a piece of timber, functioning as a hinge. The forward part of the mast assembly had a forelock. By unlocking it, the masts can be lowered across the ship. The sail can be rotated around the mast (lessening the need for steering with the rudders) and tilted to move the center of pull forward or aft. The sail can even be tilted completely horizontally, lifting the bow above incoming waves. The sail is
reefed by rolling it around the lower spar. In addition to the tanja sails, ships with the tanja rigs also have
bowsprits set with a quadrilateral
headsail, sometimes also canted as depicted in the
Borobudur ships. == Usage ==