Thonburi-class coastal defence ship


The Thonburi class was a class of coastal defence ships of the Royal Thai Navy. It consisted of two ships built by Kawasaki and delivered in 1938, HTMS Thonburi and HTMS Sri Ayudhya.

Design

and her sister ship, Sri Ayudhya, were designed following the incorporation of the earlier s into the Siamese Navy in the 1920s. The Ratanakosindra class were British-built ships which featured six-inch guns in two turrets and light armor. Under Plaek Pibulsonggram's command, the Siamese Navy began a series of modernization efforts. Priorities for the navy consisted of protecting the extensive Thai coastline, and coastal gunboats were viewed as the best resource. Several foreign firms from European countries offered a variety of designs, but in the end the Japanese company Kawasaki won the tender.
The new vessels were basically larger versions of the earlier Ratanakosindra ships. The ships were laid down at Kawasaki's facilities in 1936, and the first, Sri Ayuthia, was launched on 21 July 1937. The resulting "battleships," as they were referred to in Siam at the time, displaced 2,265 tons, featured increased armor protection, and were powered by twin diesels produced by MAN of Germany.

Armament

Armament consisted of four /50 calibre guns mounted in pairs in two turrets. The Japanese 8-inch rifles were of the same type as mounted in early Imperial Japanese Navy heavy cruisers and the aircraft carriers and. The main armament had a maximum range of at 25 degrees of elevation. A tower above the bridge featured a gun director for aiming the main guns. Additional armament consisted of four 3-inch and four 40-mm guns.

Public opinion

The new ships were enthusiastically received by the Siamese Navy. Purchasing further vessels of the type was considered by the government, but ultimately it was decided to purchase two Italian-built cruisers in 1938. Both ships were seized by Italy in 1941 before construction had finished, leaving Thonburi and her sister ship as the most powerful combatants in Siamese service.

History

Ships in class