Construction
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The main body of the float was composed of nine balsa tree trunks up to 13.7 metres (45 ft) long, 60 cm (2 ft) in diameter, lashed together with 3.175 cm (1¼ inch) hemp ropes. Cross-pieces of balsa logs 5.5 m (18 ft) long and 30 cm (1 ft) in diameter were lashed across the logs at 1 m (3 ft) intervals to give lateral support. Pine splashboards clad the bow, and lengths of pine 2.5 cm (1 inch) thick and 60 cm (2 ft) wide were wedged between the balsa logs and used as centerboards.
The main mast was made of lengths of mangrove wood lashed together to form an A-frame 8.8 m (29 ft) high. Behind the main-mast was a cabin of plaited bamboo 4.2 m (14 ft) long and 2.4 m (8 ft) wide was built about 1.21–1.51 m (4–5 feet) high, and roofed with banana leaf thatch. At the stern was a 5.8 m (19 ft) long steering oar of mangrove wood, with a blade of fir. The main sail was 4.6 m by 5.5 m (15 by 18 feet) on a yard of bamboo stems lashed together. Photographs also show a top-sail above the main sail, and also a mizzen-sail, mounted at the stern.
The raft was partially decked in split bamboo. The main spars were a laminate of wood and reeds and Heyerdahl tested more than twenty different composites before settling on one that proved an effective compromise between bulk and torsional rigidity. No metal was used in the construction.
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