Ryukyu Seacraft

From Maritime Ryukyu, 1050–1650, by Gregory Smits (University of Hawaii Press, 2018), Kindle pp. 288-291:

During period two [1450-1520s], Ryukyu continued to obtain vessels from China. However, instead of receiving used military vessels for free, Ryukyu bore the costs of vessel construction and subsequent repairs. Ship size did not change, an indirect indication of the continuing vigor of the tribute trade. During this period and the previous one, each ship received a single-character name such as “vigor,” “wisdom,” “courage,” or “longevity” at the shipyard when built. After arriving in Ryukyu, the ship received a Japanese name ending in -maru. Probably from around the late fifteenth century onward, ships also received a Ryukyuan name ending in -tomi. These names of ships are found in the Omoro, and vessels appearing in the songs would usually have had alternative Chinese and Japanese names.

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During this period [1520s-ca. 1570], the Ryukyuan fleet continued to consist of relatively small ships, possibly even smaller than before. The question is whether Ryukyu continued to purchase ships from China or whether it built its own. The first ship of the designation “small ships of [our?] country” (honkoku shōsen) appears in documents in 1541, and ships with this description, as well as other terms with “small” in them, were common from 1549 onward. Okamoto and Tomiyama Kazuyuki regard these ships as having been made in China. However, it is likely that they were civilian merchant ships. Tomiyama points out that in 1555 Shō Sei asked to purchase such a ship from the Ming court with the express proviso that “it need not be large.” By contrast, Mamoru Akamine states that during Shō Sei’s reign (1527–1555), “the shipbuilding industry shifted to Ryukyu itself and Ryukyuan-built hulls came to be used in the tribute trade.” Recall from chapter 3 that Ikuta Shigeru also regarded the smaller ships built after 1548 as Ryukyuan-made vessels.

We cannot be absolutely certain where ships were made during this period or precisely when the first Okinawan-made ship (other than vessels of a relatively simple dugout design) was built. Nevertheless, Okamoto and Tomiyama present good evidence that the 1540s or 1550s marked a transition from smaller military ships to somewhat smaller Chinese-made merchant ships as the mainstay of Ryukyu’s fleet. It is likely that the first Okinawan-made ships used in trade and diplomacy were built in the 1570s, during the reign of Shō Ei (r. 1573–1586). In documents, these ships are called “local ships” (tsuchibune), “small ships,” and possibly by other terms.

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As we have seen, Omoro songs often mention ships. One describes the ship of an elite lord (aji) as having a cloth sail and the ship of a low official as having a sail made from matting. The details of local boat and ship manufacturing in the Ryukyu islands are unclear in most cases. However, extrapolating backward from the early modern era and piecing together other information such as the omoro mentioned here, it is almost certain that early Ryukyuans manufactured boats and small ships (known by sabani and other terms). These were dug out from large trees to form canoe-like hulls that could be rowed or sailed. Tying four of these hulls together and placing boards across the top created a henzabune, which during the early modern era were sometimes used to transport liquor (awamori) to Amami-Ōshima and return with as many as eight head of cattle. It is almost certain that Ryukyuans manufactured a variety of dugout vessels for use in local and island-to-island transport between Okinawa, Amami-Ōshima, and other northern Ryukyu islands.

Did Ryukyuans manufacture ships more complex than dugout vessels before the 1570s? A shipbuilding tradition in Uruka in Miyako began in approximately the early fifteenth century and continued into the early modern era. These Uruka ships (Uruka-miuni) were built mainly in the Japanese manner by attaching two layers of planks to a keel, with the mast located in the middle of the ship and capable of being lowered during severe weather. Uruka ships conducted trade and transported tribute shipments across the Kerama gap to Okinawa, and Inamura Kenpu regards them as part of the wakō legacy in Sakishima. There is some evidence that mariners from Miyako were able to sail as far as Southeast Asia during the fourteenth century.