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| The keel and jimatsura, the skeleton of the boat, are mounted to reinforce the body of the boat. For western ships, the bony framework is constructed with keel before boards are laid. For Japanese ships, on the other hand, the body of a ship is first constructed and then reinforced with jimatsura and keel. Towards the stem where the impact of a wave is stronger, the spacing should be made smaller. |
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The keel and jimatsura should be fixed with bolts. Japanese nails were used before. Since keyaki was hard, it was hard to drive bolts into it. |
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Inking on the keel |
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| The keel is made of keyaki. Keyaki is hard, and therefore it is hard to break but also hard to be processed. |
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Makihada is wound around the bolts. |
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