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Japanese MTBs in World War II

The drawings presented here were supplied by Dave Gregory, owner of the PT Dockyard - maker of small scale models. The large color drawing below illustrates a Type T-14 boat and the trio of boats under that are Type T-25, T-51 and a Type T-14.

The color drawing on the top of the page is the Type T-14. According to Harold Foch's Fast Fighting Boats, there were eighty-one of this type built and they carried the hull numbers of 538 to 555 and 838 to 900.

During World War II, Japan built two hundred forty eight MTBs in fifteen different classes. These were:

Type T-1 contained six boats, bearing the hull numbers 1 to 6
Type T-14 contained eighty-one boats, bearing the hull numbers 538 to 555 and 838 to 900.
Type T-15 contained thirty-nine boats, bearing the hull numbers 1001 to 1008, 1101 to 1131.
Type T-23 contained twenty-three boats, bearing the hull numbers 201 to 207, 401 to 410, 451 to 456.
Type 25 contained six boats, bearing the hull numbers 468, 484 to 488.
Type 31 contained thirty-three boats, bearing the hull numbers of 208 to 240.
Type T-32 contained eight boats, bearing the hull numbers 301 to 308.
Type T-33 contained six boats, bearing the hull numbers 500 to 505.
Type T-34 contained fifteen boats, bearing the hull numbers 151 to 165.
Type T-35 contained fifty-five boats, bearing the hull numbers 469, 482 to 483, 494 to 499, 529-537, 801 to 837.
Type T-36 contained forty-four boats, bearing the hull numbers 411 to 450, 470 to 473.
Type T-37 contained apparently just one boat, bearing the hull number 327
Type T-38 contained eighty boats, bearing the hull numbers 241 to 286, 457 to 467, 506 to 528.
Type T-39 contained eight boats, bearing the hull numbers 474 to 481.
Type T-51 contained thirty-six boats, bearing the hull numbers 10 to 27, 5441 to 5458.

The Type T-51

The Type T-51 was based on the German Schnellboot type. These were approximately one hundred seven feet in length with a beam of approximately eighteen feet. They drew over three feet of water. They weighed in at some eighty-four tons with their war-loads and were powered by four engines of nine hundred twenty horse-power each. The boats were armed with three 25mm cannons and two 45.7cm torpedoes. Eight depth charges and two depth charge projectors were carried. In an pure ASW Role, additional depth charges could be carried in lieu of the two torpedoes. They had a range of three hundred forty miles at a top speed of twenty-eight knots or one thousand miles, cruising at sixteen knots.

Of the Type T-51 boats, only nine were completed before the war's end, and another two hulls were left unfinished at war's end. The Type T-51boats were deemed to be unsuccessful and relegated to being used as what the Japanese referred to as "Guard Boats" and had two of their four engines removed.

Type T-14

The Type T-14 boats were approximately fifty feet in length with a beam of approximately eleven feet. These boats weighed in at fifteen tons. They drew just over two feet of water and were powered by one engine of nine hundred twenty horsepower and had a maximum speed of thirty-three knots. They were armed with one 25mm cannon and two 45.7cm torpedoes and provisions for depth charges.

Type T-25

These boats were approximately sixty feet with a beam of fourteen feet and drew just under two and a half feet of water. Their maximum weight was twenty-five tons and they were powered by one nine hundred twenty horse power engine and one eighty horse power cruising engine. Their top speed was twenty-one and a half knots and were armed with one machine gun and two 45.7cm torpedoes.

All data in this piece was gleamed from Harold Foch's 1974 book, Fast Fighting Boats, 1870 - 1945 and all drawings included herein were supplied by David Gregory of The PT Dockyard.