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What is Hobikisen?
Hobikisen Manufacturing Process
Nailing Boards with Japanese Nails
After kigoroshi, the boards should be nailed together with Japanese nails. Compared to round nails, Japanese nails, once driven, would not pull out due to larger friction with the wood. Therefore, Japanese nails are indispensable to ship building.

Kashira (nail holes) should be made with a tsubanomi chisel.

Before driving Japanese nails, make nail holes with a tsubanomi chisel on the aligned boards.

Hammer the nail rhythmically so as not to break the boards.

Keeping rhythm when hammering is unique to boat builders. Since the boards are not much that thick (just over 3 cm), care should be given to drive nails straight.

Depending on the area of nailing, three kinds of Japanese nails are available. Nails are made by blacksmiths.
Depending on the area, nails should be bent before nailing.
Japanese nails for ships are called funakugi.
Upper and lower side panels (sappakugi nails)