*dctpbpenn

Japanese 'Boats' and Small Craft

29 posts in this topic

Ever since Gaijin unveiled their naval battles closed beta, currently limited to smaller vessels, I scrambled to research Japanese designs which we might expect to see in the near future. Japan was a nation which focused greatly on larger warships like Battleships and Aircraft Carriers. Their Destroyers even tended to larger than their contemporaries. For example, a Kagerō-class destroyer had a length of 118.5 m and a standard displacement of ~2,000 t, whereas a Gleaves-class destroyer of the United States Navy built around the same period had a length of about 106 m and a standard displacement of 1,620 t. Certain information for even our most beloved and well-known ships like the Yamato is hard to find due to the loss or destruction of records during the war and after the surrender. And for a nation which did not pay much attention to smaller craft in the first place makes the situation even more difficult. As a result, Japan will likely be one of the least competitive nations in the current meta, but hopefully others will at least be pleasantly surprised that these craft exist. Whatever information I come across will be posted here, and I encourage others to do the same if they have found anything not already seen here. It will be organized in three separate posts: IJA, IJN, and Other.

 

Notes

  • This does not yet include post-war craft of the JMSDF.
  • This does not yet include captured vessels (Many vessels were captured or salvaged from the Americans, British, Dutch, and Chinese in locations including Singapore and the Philippines).
  • Shinyo, a deliberate suicide weapon optionally armed with machine guns, is not included.
  • Any sources I find are exclusively found online as I do not have access to many relevant books. These may include digitized documents and cited material from published works, but mostly rely on online encyclopedias, modelling websites, and discussions from other forums.

 

IJA

 

AB-Tei River Gunboat 1927

 

Spoiler

z0sbp5Q.jpg?2

ryx0JPt.jpg?1

WXuQauD.jpg?1

 

Displacement: 18 t

Length: 17.1 m

Beam: 3.5 m

Speed (Max): 13 kn

Complement: 13

Armament: x2 Type 90 57 mm Tank Gun, x2 7.7 mm Machine Guns

 

Introduced in 1927, the AB-Tei was a fire-support vessel for landing operations and patrol duties. Armament was dispersed in three turrets, usually housing a Type 90 57 mm Tank Gun (the same found on the Type 89 I-Go Medium Tank) in the forward and aft turrets and a pair of 7.7 mm machine guns were located in the turret above the steering house. Armor was reported as 6 mm thick around each turret and the steering house.

 

Sources:

Armored Boat "AB-Tei"

Japanese Armored Boat AB-Tei / Type C Landing Craft / Gunboat

 

AB-Tei Developments / Variations

 

Spoiler

1utn95t.jpg?1

sXkav5q.jpg?1

q8t3X1T.jpg?1

 

New Guinea. 22 January 1944. A Japanese picquet boat wrecked in the swirling water at the mouth of the Kapugara River, lies on its side. These boats fulfill a similar function to American PT boats, but are of smaller construction. (Caption from Australian War Memorial)

 

It appears to be a late model with an extended bow, perhaps to improve seaworthiness. Also note changes to the wheelhouse. Armament changed to Type 93 13 mm AA Machine Guns with one fitted in each turret (3 total).

 

Z2drM4v.jpg?1

ca66CZp.jpg?1

 

KAIMANA, DUTCH NEW GUINEA. C.1945-09. A JAPANESE PATROL BOAT FLYING A WHITE SURRENDER FLAG AT THE STERN, IN ACCORDANCE WITH THE VOGELKOP FORCE ORDER THAT ALL VESSELS AND VEHICLES WERE TO EXHIBIT A WHITE FLAG. (Caption from Australian War Memorial)

 

Taki believes this is an experimental model of the AB-Tei. A few were produced in 1938 without the bow turret. Again, note differences in wheelhouse. Armament changed to one Type 90 57 mm Tank Gun in each turret (2 total) and twin Type 93 13 mm AA Machine Guns mounted on either side of the bridge (4 total).

 

Di5ST5Q.jpg?1

Gjv91D0.jpg?1

 

BALIKPAPAN, BORNEO. 1945-09-07. A PILE DRIVER IN OPERATION AT 2 BEACH GROUP WORKSHOPS. NOTE THE CAPTURED JAPANESE PT BOAT.

 

Unknown variant. Armament is removed and appears most similar to original AB-Tei.

 

IAjoN9N.jpg?1

 

Another unknown variant used in China during the Second Sino-Japanese War.

 

Sources:

016476 AWM

016478 AWM

116821 AWM

116822 AWM

133810 AWM

Axis History Forum: Help identifying small armored Japanese gunboat

ONI 208-J Supplement No. 2 | Far-Eastern Small Craft

 

Seha-Tei / Seni-Tei 1944-1945

 

Spoiler

In 1944, 波号戦闘艇(Hago Sentotei) was developed. There were two models in Hago Sentotei. Model I was called Seha-Tei and Model II was called Seni-Tei.

 

No Picture


Model I (Seha-Tei)
Length: 18.00 m
Beam: 3.50 m
Speed (Max): 13.5 kn
Armament: x1 57 mm ship gun, x1 Type 4 (Twin) 20 mm AA Cannon

 

1t4wGpj.jpg?1

Model II (Seni-Tei)

Displacement (Standard): 15.31 t
Length: 16.00 m
Beam: 3.50 m
Speed (Max): 9.85 kn
Armament: x1 37 mm ship gun, x1 Type 4 (Twin) 20 mm AA Cannon

 

Model I was larger and faster than Model II. But, it was not fit to mass-production. So, Model II was adopted. It was planned to produce Model II in 1945. But, it is unknown how many it was produced, even if it was actually produced. The Model II was powered by a pair of 60 hp seawater-cooled diesel engines.

In 1945, improved model of Seha-Tei was developed. It was called Seha-Tei Kai and it was adopted as 五式小護衛艇 (Type 5 Small Escort Boat). It was larger than Seha-Tei and mounted three twin 20mm AA cannons. Only prototype was built and not produced.

 

Source:

Axis History Forums: Japanese Army small gunboat Seha-Tei

Imperial Japanese Army boat Ha-gou Battle boat (Ha-gou Sentotei) Research Report (document translated by @aizenns)

 

Type 2 / Type 4 Karo-Tei Submarine Chaser 1944

 

Spoiler

AUVj8yk.jpg?1

DvBv2pC.png?1

9pbcWRl.jpg?1

 

Type 2 Karo-Tei

Displacement (Standard): 21.2 t

Length: 18.0 m

Beam: 4.3 m

Speed (Max): 25.7 kn (from trial)

Complement: 13

Armament: x1 37 mm ship gun, x1 Type 98 20 mm cannon, x2 Depth Charge Dropper + x10 Depth Charges

 

MMDd20J.jpg?1

nY0CxW5.jpg?1

 

Type 4 Karo-Tei

Displacement (Standard): 16.0 t

Length: 18.0 m

Beam: 4.0 m

Speed (Max): 38 kn (document only states >30 kn)

Complement: 13

Armament: x1 Type 4 37 mm ship gun, x1 Type 4 (Twin) 20 mm cannon, x2 Depth Charge Dropper + x10 Depth Charges

 

The Karo-Tei was developed as a Submarine Chaser, but also used as a gunboat. It was meant to combat both submarines and motor torpedo boats. The Karo-Tei had a wooden hull with V-shaped frames. In the case of the Type 2 it was powered primarily by two Type 97 650 hp air-cooled radial aircraft engines. A wind tunnel surrounded the engines, inhaling air from the intake port and sent through a fan connected to the main shaft. The Type 4 mounted a pair of Type 97 850 hp air-cooled radial engines in an unusual configuration on the rear deck and also had a 60 hp diesel engine for cruising. The Karo-Tei saw limited action around the Philippines and Okinawa.

 

Sources:
Submarine-chaser "Karo-Tei"

Karo-Tei Drawing

Imperial Japanese Army boat Kuchiku-tei (Karo-tei) Type 2 Research Report (document translated by @aizenns)
Imperial Japanese Army boat Kuchiku-tei (Karo-tei) Type 4 Research Report (document translated by @aizenns)

 

Type 5 Large Escort Boat 1945

 

Spoiler

HWT2NsF.jpg?1

NutSuCh.jpg?1

reeMKWB.jpg?1

 

Data deficient unless someone has access to and can translate the book whose cover is featured. Two versions Ko (steel) and Otsu (wood) considered. At least two prototypes of Otsu constructed. Likely armed with Type 88 75 mm AA Gun and two Type 93 13 mm Heavy Machine Gun pairings or a pair of Type 98 20 mm AA Cannons (Depth Charges?).

 

Ko
Length : 28.55 m
Beam : 4.35 m
Depth : 2.25 m

Otsu
Length : 26.83 m
Beam : 4.00 m
Depth : 2.25 m

 

Source:

Axis History Forums: Gunboats and escorts of the Japanese Army

 

Edited by *dctpbpenn
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Good Work, I hope they'll add bigger ships. So Japan can show its true colors. 

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IJN (Motor Torpedo Boats)

 

T-1 Type MTB 1941

 

Spoiler

CKCXPEC.jpg?1

QXn8v8D.jpg

 

Displacement: 17 t

Length: 18.3 m

Beam: 4.3 m

Speed (Max): 38.5 kn

Complement: 7

Armament: x2 Type 92 7.7 mm Machine Guns, x2 45.7 cm Torpedoes or x6 Depth Charges

 

Following the capture of a Thornycroft CMB at Canton in 1938, the Imperial Japanese Navy built an experimental boat at the Yokohama Yacht Co. in Tsurumi. From this the Japanese created the T-1 Type MTB, ordered under the 4th Naval Armaments Supplement Programme in 1939 and then later commissioned in 1941. They had wooden hulls with V-shaped frames and were powered by two petrol engines of 1,800 hp. Six were built. 

 

Source:

NAVYPEDIA: "T1" type motor torpedo boats (1941)

 

T-38 Type MTB 1943

 

Spoiler

WdvMJeA.gif

O5XlDQG.jpg?1

 

Displacement: 20 t

Length: 18.0 m

Beam: 4.3 m

Speed (Max): 27.5 kn

Complement: 7

Armament: x1 Type 96 25 mm AA Gun, x2 45.7 cm Torpedoes

 

In 1942 and 1943 developments were made to the T-1 Type MTB to simplify and speed up construction resulting in a myriad of types. These were slower and constructed either of wood or steel. One of these developments was the T-38 Type MTB. They were wooden vessels powered by two air-cooled Kinsei petrol engines generating 1,400 hp that operated between 1943-1945. It contained eighty vessels, making it one of Japan's largest classes of MTBs.

 

Source:

NAVYPEDIA: "T38" type motor torpedo boats (1943-1945)

 

T-51 Type MTB 1943

 

Spoiler

G006w4O.jpg?1

0P2zVXB.jpg?1

 

Displacement: 75-80 t

Length: 32.4 m

Beam: 5.0 m

Speed (Max): 29-30 kn

Complement: 18

Armament: x1 (Twin) or x3 (Single) Type 96 25 mm AA Guns, x2-4 45.7 cm Torpedoes, x2-4 DCTs carrying x8-12 Depth Charges

 

A knock-off of the German Schnellboot design, the T-51 Type MTB was intended as a leader to smaller MTBs and expected to be capable of high sea operations. It was largely unsuccessful in this roll, and performed patrol and ASW duties instead. They were wooden vessels which varied in armament and propulsion. They carried either a twin or three single Type 96 25 mm AA Guns, two to four 45.7 cm torpedoes, and two to four depth charge throwers carrying eight to twelve depth charges. Each vessel was powered either by four Type 6 or two Vulcan engines achieving 29 kn or 30 kn respectively. Eight were completed, two were incomplete, and twenty-six were cancelled.

 

Sources:

NAVYPEDIA: "T51" type motor torpedo boats (1943-1945)

WOWS: February 19 - Focus: E-boat (Post #17)

 

T-14 Type MTB 1944

 

Spoiler

lLtW58a.jpg?1

LfBYNlb.jpg?1

 

Displacement: 14.5 t

Length: 15.0 m

Beam: 3.65 m

Speed (Max): 33 kn

Complement: 7

Armament: x1 Type 96 25 mm AA Gun, x2 45.7 cm Torpedoes

 

In 1944 a much smaller craft was planned to achieve good speed without increase of engine power. The T-14 Type MTB was the result. It had a wooden hull with V-shaped frames and was only powered by a single petrol engine generating 920 hp. The class contained eighty vessels, making it another of Japan's largest classes of MTBs.

 

Source:

NAVYPEDIA: "T14" type motor torpedo boats

 

Additional sources from overviews:

Naval History and Heritage Command: Japanese Naval Shipbuilding "Know Your Enemy!" CinCPac-CinCPOA Bulletin 142-45

ONI 208-J Supplement No. 2 | Far-Eastern Small Craft 

PT Boat World - Japanese MTBs in World War II

WWIIF - MOTOR TORPEDO BOATS: History, Technical details + Action "Capsules"

Axis History Forum: Japanese Torpedo Boats

 

IJN (Submarine Chasers)

 

CH-1 / No.1 Class Submarine Chasers 1934

 

Spoiler

LTXzBsp.jpg

XiDMz8J.jpg?1

JY431y6.jpg?1

CFb63Ck.jpg?1

 

CH-1 and CH-2

Displacement (Standard): 266 t (later 376 t)

Length: 65.3 m

Beam: 5.90 m

Speed (Max): 24 kn (later 21.1 kn)

Complement: 45-60

Armament: x2 40 mm "HI" Type 91 AA Machine Guns (pompom), x2 7.7 mm Type 92 Machine Guns (later replaced with x2 (Triple) Type 96 25 mm AA Guns (1944)), x36 Depth Charges

 

CH-3

Displacement (Standard): 270 t

Length: 56.1 m

Beam: 5.60 m

Speed (Max): 20 kn

Complement: 45-60

Armament: x2 40 mm "HI" Type 91 AA Machine Guns (pompom), x2 7.7 mm Type 92 Machine Guns (later replaced with x2 (Triple) Type 96 25 mm AA Guns (1944)), x36 Depth Charges

 

Following the devastating success of the U-boat and unrestricted submarine warfare in World War I, Japan became interested in creating an anti-submarine boat achieving a speed of at least 20 kn (the same as their Kaidai III submarine when surfaced). The result was the CH-1 / No.1 Class Submarine Chaser. These submarine chasers were among the smallest combatants of the Imperial Japanese Navy. Two vessels CH-1 and CH-2 were constructed prior to the Fourth Fleet Incident (additional ballast was added thereafter), and a third CH-3 had its design modified with less top weight. They spent much of the war patrolling the Java area and CH-1 and CH-3 even managed to survive the war. 

 

*A detailed account of an encounter between CH-1 and American submarines USS Blueback and USS Lamprey can be found on blog THELEANSUBMARINER's post Gunfighters on the Java Sea – May 28 1945.

 

Sources:

Combined Fleet | CH-1 Class Submarine Chasers

NAVYPEDIA | 1-GO submarine chasers (1934)

NAVYPEDIA | 3-GO submarine chaser (1936)

The Pacific War Online Encyclopedia: Ch-1 Class, Japanese Submarine Chasers

The Pacific War Online Encyclopedia: Ch-3, Japanese Submarine Chaser

 

CH-4 / No.4 Class Submarine Chasers 1938

 

Spoiler

vCbNtqJ.jpg?1

txIzUMZ.jpg?1

W4GFJka.jpg?1

 

Displacement (Standard): 291 t

Length: 56.2 m

Beam: 5.60 m

Speed (Max): 20 kn

Complement: 59

Armament: x2 40 mm "HI" Type 91 AA Machine Guns (pompom), x36 Depth Charges + x3 (Single) Type 96 25 mm AA Guns (1944)

 

Based on the CH-3 (a modification of the CH-1 Class) with a smaller superstructure moved astern, the CH-4 was the next development of Japanese submarine chasers. Nine vessels were constructed and commissioned, and it was also known as the CH-7 Class (CH-7 was the first vessel completed). Three single Type 96 25 mm AA Guns were added in 1944.

 

Sources:

Combined Fleet | CH-4 Class Submarine Chasers

NAVYPEDIA | 4-GO submarine chasers (1938-1939)

The Pacific War Online Encyclopedia: Ch-7 Class, Japanese Submarine Chasers

 

CH-13 / No.13 Class Submarine Chasers 1940

 

Spoiler

NhZu4R1.jpg?1 

4fN7wjK.jpg?1

ChiV953.jpg?1

BAqGo4A.gif?1

 

Displacement (Standard): 438 t

Length: 51.0 m

Beam: 6.70 m

Speed (Max): 16 kn

Complement: 68

Armament: x1 3"/40 Gun, x2 (Single) Type 93 13 mm AA Machine Guns, 36 Depth Charges + x3 (Single) Type 96 25 mm AA Guns (1944)

 

With the Soviet's strengthening of their Pacific Ocean Fleet in 1938 (namely in submarines), this next class was born to counter the potential threat. The CH-13 Class was wider and carried more depth than its predecessors, producing a much more maneuverable design with greater seaworthiness. 15 vessels were built of this class. 

 

Sources:

Combined Fleet | CH-13 Class Submarine Chasers

NAVYPEDIA | 13-GO submarine chasers (1940-1942)

The Pacific War Online Encyclopedia: Ch-13 Class, Japanese Submarine Chasers

 

CH-28 / No.28 Class Submarine Chasers 1942

 

Spoiler

7Sdmfcm.jpg?1

5CfcWkn.jpg?1

Rs4ip7V.jpg?1

eyCNMv9.jpg?1

 

Displacement (Standard): 420 t

Length: 51.0 m

Beam: 6.70 m

Speed (Max): 16 kn

Complement: 80

Armament: x1 3"/40 Gun, x2 (Single) Type 93 13 mm AA Machine Guns, 36 Depth Charges + x1 (Triple) Type 96 25 mm AA Gun (1944)

 

Noting wartime conditions, the CH-28 Class was a slightly modified version of the CH-13 Class abolishing a slant of stern for mass production. 34 vessels of this type were built. Numbers 60, 61, and 63 had slight differences in their inner hull design and are sometimes considered a separate class.

 

Sources:

Combined Fleet | CH-28 Class Submarine Chasers

NAVYPEDIA | 28-GO submarine chasers (1942-1944)

The Pacific War Online Encyclopedia: Ch-28 Class, Japanese Submarine Chasers

Edited by *dctpbpenn
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Thanks all, I hope others will take notice and join the discussion. A new source has been added. ONI 208-J Supplement No. 2 | Far-Eastern Small Craft from the Division of Naval Intelligence. Additional information added to AB-Tei Developments / Variations (noting armament and design differences) and T-1 Type MTB (with detailed drawing and additional picture; note camouflage). I know I said I would present information on Submarine-chasers of the IJN next, but they will take additional time as I continue to compile information. Also my most recent semester of college has started, leaving me increasingly short on time.

 

Other

 

Whale Killers

 

Spoiler

QCXiE2t.jpg?1

R8Z2t8D.jpg

CsVZC3F.jpg

Sy9BbRU.jpg

u4Hvlli.jpg

Ey8hrfa.jpg

 

Many of Japan's whaling ships were converted to perform a myriad of tasks including coastal patrol, escort duties, mine sweeping, net tending, ASW, etc. Often the harpoon gun situated on the bow was replaced with a 3" gun and could also be armed with machine guns or other light AA as well as carry mines and/or depth charges.

 

Source:

ONI 208-J Supplement No. 2 | Far-Eastern Small Craft

 

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By the way, whole this boat buisness made me think... How about armed landing crafts? :D

Its called (武装大発) busou daihatsu meaning simply armed daihatsu: http://cb1100f.b10.coreserver.jp/busoudaihatu_3.jpg https://ja.wikipedia.org/wiki/大発動艇

(You'll see a wooden model but all Daihatsu's were made of steel)

 

Although as far as I know, this arming-up was not official.

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Great presentation!

Do add more to discussion.

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I finally added Submarine Chasers under Motor Torpedo Boats in the IJN post. Please see it and definitely check out the encounter between CH-1 and American submarines USS Blueback and USS Lamprey off Java in 1945, it'll give a little insight to how they operated.

 

On 8/28/2016 at 10:42 AM, SaitaniUmetarou said:

By the way, whole this boat buisness made me think... How about armed landing crafts? :D

Its called (武装大発) busou daihatsu meaning simply armed daihatsu: http://cb1100f.b10.coreserver.jp/busoudaihatu_3.jpg https://ja.wikipedia.org/wiki/大発動艇

(You'll see a wooden model but all Daihatsu's were made of steel)

 

Although as far as I know, this arming-up was not official.

 

I have considered landing craft like the Daihatsu and the Type 4 Ka-Tsu. The latter is really quite an oddity. It's tracked, slow, and armed with only two Type 93 13 mm AA Machine Guns and a pair of Torpedoes, does it go into ground or naval forces? Will it even fit either's gameplay? As for the Daihatsu, I understand it could be armed with weapons up to 40 mm, but I'm just not sure about landing craft. There are no infantry in game. Other landing craft like the LCVP (Higgins boat) are hardly seaworthy and they tend to be slow anyways. I will give it to you that the Daihatsu was a superior honorabru vessel and used in multiple roles throughout the war. I may add it under Other (since it was used by both Army and Navy) sometime later.

 

On 9/1/2016 at 0:17 PM, Pony51 said:

Great presentation!

Do add more to discussion.

 

Thanks, I will certainly try! And thanks for the pin as well. :)

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On 2016/8/21 at 1:51 PM, *dctpbpenn said:

Ever since Gaijin unveiled their naval battles closed beta, currently limited to smaller vessels, I scrambled to research Japanese designs which we might expect to see in the near future. Japan was a nation which focused greatly on larger warships like Battleships and Aircraft Carriers. Their Destroyers even tended to larger than their contemporaries. For example, a Kagerō-class destroyer had a length of 118.5 m and a standard displacement of ~2,000 t, whereas a Gleaves-class destroyer of the United States Navy built around the same period had a length of about 106 m and a standard displacement of 1,620 t. Certain information for even our most beloved and well-known ships like the Yamato is hard to find due to the loss or destruction of records during the war and after the surrender. And for a nation which did not pay much attention to smaller craft in the first place makes the situation even more difficult. As a result, Japan will likely be one of the least competitive nations in the current meta, but hopefully others will at least be pleasantly surprised that these craft exist. Whatever information I come across will be posted here, and I encourage others to do the same if they have found anything not already seen here. It will be organized in three separate posts: IJA, IJN, and Other.

 

Notes

  • This does not yet include post-war craft of the JMSDF.
  • This does not yet include captured vessels (Many vessels were captured or salvaged from the Americans, British, Dutch, and Chinese in locations including Singapore and the Philippines).
  • Shinyo, a deliberate suicide weapon optionally armed with machine guns, is not included.
  • Any sources I find are exclusively found online as I do not have access to many relevant books. These may include digitized documents and cited material from published works, but mostly rely on online encyclopedias, modelling websites, and discussions from other forums.

 

IJA

 

AB-Tei River Gunboat 1927

 

  Reveal hidden contents

z0sbp5Q.jpg?2

ryx0JPt.jpg?1

WXuQauD.jpg?1

 

Displacement: 18 t

Length: 17.1 m

Beam: 3.5 m

Speed (Max): 13 kn

Complement: 13

Armament: x2 Type 90 57 mm Tank Gun, x2 7.7 mm Machine Guns

 

Introduced in 1927, the AB-Tei was a fire-support vessel for landing operations and patrol duties. Armament was dispersed in three turrets, usually housing a Type 90 57 mm Tank Gun (the same found on the Type 89 I-Go Medium Tank) in the forward and aft turrets and a pair of 7.7 mm machine guns were located in the turret above the steering house. Armor was reported as 6 mm thick around each turret and the steering house.

 

Sources:

Armored Boat "AB-Tei"

Japanese Armored Boat AB-Tei / Type C Landing Craft / Gunboat

 

AB-Tei Developments / Variations

 

  Reveal hidden contents

1utn95t.jpg?1

sXkav5q.jpg?1

q8t3X1T.jpg?1

 

New Guinea. 22 January 1944. A Japanese picquet boat wrecked in the swirling water at the mouth of the Kapugara River, lies on its side. These boats fulfill a similar function to American PT boats, but are of smaller construction. (Caption from Australian War Memorial)

 

It appears to be a late model with an extended bow, perhaps to improve seaworthiness. Also note changes to the wheelhouse. Armament changed to Type 93 13 mm AA Machine Guns with one fitted in each turret (3 total).

 

Z2drM4v.jpg?1

ca66CZp.jpg?1

 

KAIMANA, DUTCH NEW GUINEA. C.1945-09. A JAPANESE PATROL BOAT FLYING A WHITE SURRENDER FLAG AT THE STERN, IN ACCORDANCE WITH THE VOGELKOP FORCE ORDER THAT ALL VESSELS AND VEHICLES WERE TO EXHIBIT A WHITE FLAG. (Caption from Australian War Memorial)

 

Taki believes this is an experimental model of the AB-Tei. A few were produced in 1938 without the bow turret. Again, note differences in wheelhouse. Armament changed to one Type 90 57 mm Tank Gun in each turret (2 total) and twin Type 93 13 mm AA Machine Guns mounted on either side of the bridge (4 total).

 

Di5ST5Q.jpg?1

Gjv91D0.jpg?1

 

BALIKPAPAN, BORNEO. 1945-09-07. A PILE DRIVER IN OPERATION AT 2 BEACH GROUP WORKSHOPS. NOTE THE CAPTURED JAPANESE PT BOAT.

 

Unknown variant. Armament is removed and appears most similar to original AB-Tei.

 

IAjoN9N.jpg?1

 

Another unknown variant used in China during the Second Sino-Japanese War.

 

Sources:

016476 AWM

016478 AWM

116821 AWM

116822 AWM

133810 AWM

Axis History Forum: Help identifying small armored Japanese gunboat

ONI 208-J Supplement No. 2 | Far-Eastern Small Craft

 

Seha-Tei / Seni-Tei 1944-1945

 

  Reveal hidden contents

In 1944, 波号戦闘艇(Hago Sentotei) was developed. There were two models in Hago Sentotei. Model I was called Seha-Tei and Model II was called Seni-Tei.

 

No Picture


Model I (Seha-Tei)
Length: 18.00 m
Beam: 3.50 m
Speed (Max): 13.5 kn
Armament: 57 mm ship gun, dual Type 98 20 mm AA Cannon

 

1t4wGpj.jpg?1

Model II (Seni-Tei)
Length: 16.00 m
Beam: 3.50 m
Speed (Max): 9.85 kn
Armament: 37 mm ship gun, dual Type 98 20 mm AA Cannon

 

Model I was larger and faster than Model II. But, it was not fit to mass-production. So, Model II was adopted. It was planned to produce Model II in 1945. But, it is unknown how many it was produced, even if it was actually produced.

In 1945, improved model of Seha-Tei was developed. It was called Seha-Tei Kai and it was adopted as 五式小護衛艇 (Type 5 Small Escort Boat). It was larger than Seha-Tei and mounted three twin 20mm AA cannons. Only prototype was built and not produced.

 

Source:

Axis History Forums: Japanese Army small gunboat Seha-Tei

 

Karo-Tei Submarine Chaser 1944

 

  Hide contents

MMDd20J.jpg?1

9pbcWRl.jpg?1

 

Displacement: 18 t

Length: 18.0 m

Beam: 4.3 m

Speed (Max): 38 kn

Complement: 13

Armament: x1 Type 98 20 mm cannon (single or double mount), x10 Depth Charges

 

The Karo-Tei was developed as a Submarine Chaser, but also used as a gunboat. This is supported by the drawing which suggests an adapted 37 mm AT Gun was positioned in the forward section, as seen in a similar mounting here on an IJA Type 3 Maru Yu Transport Submarine. The Karo-Tei in the first photo is specially equipped with aircraft engines. They saw limited action around the Philippines and Okinawa.

 

Sources:

Submarine-chaser "Karo-Tei"

Karo-Tei Drawing

 

Type 5 Large Escort Boat 1945

 

  Reveal hidden contents

HWT2NsF.jpg?1

NutSuCh.jpg?1

reeMKWB.jpg?1

 

Data deficient unless someone has access to and can translate the book whose cover is featured. Two versions Ko (steel) and Otsu (wood) considered. At least two prototypes of Otsu constructed. Likely armed with Type 88 75 mm AA Gun and two Type 93 13 mm Heavy Machine Gun pairings or a pair of Type 98 20 mm AA Cannons (Depth Charges?).

 

Ko
Length : 28.55 m
Beam : 4.35 m
Depth : 2.25 m

Otsu
Length : 26.83 m
Beam : 4.00 m
Depth : 2.25 m

 

Source:

Axis History Forums: Gunboats and escorts of the Japanese Army

 

"Karo-tei submarine chaser" 

I think first photo is Karo-tei Type 4 because it has big propeller on deck. (Why IJA engineers select Wind propulsion system lol)

And, I guess second photo(illustration) is not collect. Report about Karo-tei say there are big Inlet and exhaust port. Please look at attached images.

 

"Seha-tei&Seni-tei"

In developer's report of Seni-tei, seni-tei has two Depth charge dropper. Please look 123.jpg

 

Karo_zumenn_rooms_and weapons.png

Karo_zumenn_size.png

18.jpg

123.jpg

Edited by aizenns
I forget to attack 123.jpg
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On 9/4/2016 at 8:35 AM, aizenns said:

"Karo-tei submarine chaser" 

I think first photo is Karo-tei Type 4 because it has big propeller on deck. (Why IJA engineers select Wind propulsion system lol)

And, I guess second photo(illustration) is not collect. Report about Karo-tei say there are big Inlet and exhaust port. Please look at attached images.

 

"Seha-tei&Seni-tei"

In developer's report of Seni-tei, seni-tei has two Depth charge dropper. Please look 123.jpg

 

I appreciate what you're doing. I'll update the post once you've finished translating documents for the Type 4 and probably split the Karo-Tei into two different sections for the Type 2 and Type 4.

 

52 minutes ago, xxkvasirxx said:

well not sure but also the No.251 class auxiliary submarine chaser could be fitted in your list

 

I considered them, and I may add them later, but because they were too small they did not see any action and were mostly used for training before being converted into tugs.

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Many thanks to _mike10d who highlighted some of the files on the dev server for 1.63 "Desert Hunters." It can be found here.

 

Relevant files include:

 

  • jp_kusen_tei_13_1942
  • jp_t14_class_mod01
  • jp_t14_class

 

  • jp_type_11_pt_15

 

Of course, we are already aware of the Type 11 PT-15, which came as disappointing for many of us. The first one seems to be indicative of the CH-13 / No.13 Class of Submarine Chasers based on the romanization given by Wikipedia (第十三号型駆潜艇, Dai 13 Gō-gata Kusentei). The other two files show that we will be getting the T-14 Type Class of Motor Torpedo Boats (MTBs). I'm curious to know what the difference is between the basic model and "mod01." Some stat card images are provided but only includes PT-15 which we have already seen...

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I'm super excited for the CH-13!!!!!

 

I have a tiny 1/700 model of it waiting to be built lol.

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On 19.9.2016 at 4:07 AM, *dctpbpenn said:

I'm curious to know what the difference is between the basic model and "mod01.

I found this

http://www.navypedia.org/ships/japan/jap_aux_t14.htm

which suggest that the mod01 could have a 25/60 96-shik instead of the 13.2/76 gun

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49 minutes ago, Lord_of_Sofa said:

I found this

http://www.navypedia.org/ships/japan/jap_aux_t14.htm

which suggest that the mod01 could have a 25/60 96-shik instead of the 13.2/76 gun

 

Yep, that's one of the sources I cited. It's possible but I'd assume the differences between the two to be greater than just armament. That could be easily achieved via a researchable modification similar to the Ki-43 Hayabusa and by itself does not necessarily warrant a whole other ship.

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On 9/20/2016 at 6:43 PM, Lord_of_Sofa said:

25 mm is almost double the caliber. The amount of HE could warrant a second ship.

 

I guess that is a reasonable justification. The armament difference seems to vary by individual vessels, rather than as a refit. The range differences between the Type 93 13 mm AA Machine Gun and the Type 96 25 mm AA Gun are within 1000 meters.

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t14_07_940_0902d00f13382cca16d9bb62a1149

 

At last an honorable Imperial Japanese Navy vessel has debuted! For more information on the T-14 Class of Motor Torpedo Boats (MTBs), visit either the devblog or the subsection in the vessels of the IJN post up top. Also, I will try to update the thread soon. Escort ships may come next.

Edited by *dctpbpenn
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2 hours ago, xxkvasirxx said:

im intrested about the diference between both  T-14 MTBs ... is it only the gun that was chanced ? or can we expect more difference ? 

Only the gun

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On 2016/8/21 at 1:51 PM, *dctpbpenn said:

ガイジンが海軍戦闘のベータ版を発表して以来、現在では小型船に限られていました。日本は、戦艦や航空母艦のような大型軍艦に重点を置いた国でした。彼らの駆逐艦は同時代よりも大きな傾向があった。例えば、Kagerō級の駆逐艦は118.5mの長さと約2000tの標準変位を持っていたのに対し、同時期に建設された米海軍のGleaves級の駆逐艦は約106mの長さと標準変位1,620トン ヤマトのような最も愛され、よく知られている船でさえ、戦争や降伏後の記録の消失や破壊のために、特定の情報を見つけるのは難しいです。そして、最初に小さな工芸品にあまり注意を払わなかった国にとっては、その状況はさらに困難になります。その結果、日本は現在のメタの中で最も競争力のない国の一つになるだろうが、他の人たちは、少なくともこれらの工芸品が存在することに喜んで驚くだろう。どんな情報でも私がここに掲載されます、そして、私は他の人が既にここに見られない何かを見つけたら、同じことをするように勧めます。:それは、3つの別々のポストに開催される日本陸軍海軍、およびその他

 

ノート

  • これには、戦後の陸上自衛隊の技術はまだ含まれていない。
  • これにはまだ捕獲された船舶は含まれていない(多くの船舶は、シンガポールやフィリピンを含む地域でアメリカ人、イギリス人、オランダ人、中国人から捕獲された)。
  • Shinyo、故意の自殺武器、必要に応じて機関銃で武装は、含まれていません。
  • 私が見つけたすべての情報源は、多くの関連書籍にアクセスすることができないため、オンラインでしか見つかっていません。これらには、デジタル化された文書や出版された作品の引用資料が含まれていますが、主にオンライン百科事典、モデリングWebサイト、および他のフォーラムからの議論に依存しています。

 

IJA

 

AB-Tei River Gunboat 1927

 

  隠された内容を明らかにする

z0sbp5Q.jpg?2

ryx0JPt.jpg?1

WXuQauD.jpg?1

 

排気量:18トン

長さ:17.1メートル

ビーム:3.5m

スピード(最大):13 kn

補足:13

武装:x2タイプ90 57 mmタンクガン、x2 7.7 mmマシンガン

 

1927年に導入されたAB-Teiは、着陸作業と巡視任務のための火災支援船でした。武装隊は3つの砲塔に分散されていた。通常、前方砲塔と後方砲塔にはType 90の57mmタンクガン(タイプ89のI-Goミディアムタンクにあるもの)が収納され、ステアリングハウス。Armorは各タレットとステアリング・ハウスの周りに6 mmの厚さであると報告されました。

 

ソース:

装甲艇「ABテイ」

日本の装甲ボートABテイ/タイプC着陸クラフト/ガンボート

 

AB-Teiの開発/バリエーション

 

  隠された内容を明らかにする

1utn95t.jpg?1

sXkav5q.jpg?1

q8t3X1T.jpg?1

 

ニューギニア。1944年1月22日。Kapugara川の口にある渦巻き水の中で破壊された日本のピクニックボートは、その側にあります。これらのボートは、アメリカのPTボートと同様の機能を果たしますが、より小型の構造です。(オーストラリア戦争記念館からのキャプション)

 

おそらくは耐航性を向上させるために、長い弓のついた後期モデルであるようです。また、ホイールハウスの変更に注意してください。Armamentはタイプ93の13ミリメートルAAマシンガンに変更され、各ターレットに1つずつ装備されています(合計3つ)。

 

Z2drM4v.jpg?1

ca66CZp.jpg?1

 

カイマナ、デューティーニューギニア。C.1945-09。ボルケーノフォース発注に従って、すべての船舶および車両が白い旗を出すようになっています。(オーストラリア戦争記念館からのキャプション)

 

TakiはこれがAB-Teiの実験モデルだと考えています。いくつかは1938年に弓砲塔なしで生産されました。ここでもまた、ホイールハウスの違いに注意してください。武装は各砲塔(1合計)のタイプ90 57ミリメートルタンクガンとブリッジの両側に取り付けられたツインタイプ93 13ミリメートルAAマシンガン(4合計)に変更されました。

 

Di5ST5Q.jpg?1

Gjv91D0.jpg?1

 

バルカパパン、ボルネオ。1945-09-07。2つのビーチ・グループ・ワークショップの運転中の翼の運転手。捕獲された日本のPTボートに注意してください。

 

不明なバリアント。武装は取り除かれ、元のAB-Teiと最もよく似ています。

 

IAjoN9N.jpg?1

 

第二次日中戦争で中国で使われた別の未知の変種。

 

ソース:

016476 AWM

016478 AWM

116821 AWM

116822 AWM

133810 AWM

枢軸軍の歴史フォーラム:小型装甲車の識別

ONI 208-J Supplement No.2 | 極東スモールクラフト

 

Seha-Tei / Seni-Tei 1944-1945

 

  隠された内容を明らかにする

1944年には、波号戦闘艇(ハゴ・センテテイ)が開発されました。ハゴ・センテテイには2つのモデルがありました。モデルIはセハテイと呼ばれ、モデルIIはセニテイと呼ばれました。

 

画像なし


モデルI(Seha亭)
長さ:18.00メートル
ビーム:3.50メートル
速度(最大):13.5 KN
武装:57ミリメートル艦砲、デュアルタイプ98 20ミリメートルのAAキャノン

 

1t4wGpj.jpg?1

モデルII(セニ亭)
長さ:16.00メートル
ビーム:3.50メートル
速度(最大):9.85 KN
武装:37ミリメートル艦砲、デュアルタイプ98 20ミリメートルのAAキャノン

 

モデルIはモデルIIより大きく、速かった。しかし、大量生産には適していませんでした。そこで、モデルIIを採用した。1945年にモデルIIを生産する計画だったが、実際に生産されたとしても、どれだけ生産されたのかは不明である。

1945年に、セハテイの改良されたモデルが開発されました。それは曹達帝と呼ばれ、五式小護衛艇(5号小型護衛艇)として採択された。それはSeha-Teiより大きく、3つのツイン20mm AA大砲を搭載しました。プロトタイプのみが作成され、作成されませんでした。

 

ソース:

枢軸軍の歴史フォーラム:日本の軍隊の小さな砲艦Seha-Tei

 

Karo-Tei Submarine Chaser 1944

 

  隠された内容を明らかにする

MMDd20J.jpg?1

9pbcWRl.jpg?1

 

排気量:18トン

長さ:18.0 m

ビーム:4.3m

速度(最大):38 kn

補足:13

武装:x1タイプ98 20 mm大砲(シングルまたはダブルマウント)、x10深度充電

 

Karo-TeiはSubmarine Chaserとして開発されましたが、砲艦としても使用されました。これは、同様の実装に見られるように、ガンAT適応さ37ミリメートルは、前方部分に配置された示唆して描画することによってサポートされている  、ここで日本陸軍の種類に3丸ゆう交通潜水艦。最初の写真のKaro-Teiには、航空機エンジンが装備されています。彼らはフィリピンと沖縄を中心に限られた措置を見た。

 

ソース:

潜水艦「加圧亭」

加圧絵

 

タイプ5大型護衛艇1945

 

  内容を隠す

HWT2NsF.jpg?1

NutSuCh.jpg?1

reeMKWB.jpg?1

 

誰かがカバーが付いている本にアクセスしてその本を翻訳できる場合を除き、データが不足しています。Ko(鋼)とOtsu(木)の2つのバージョンが考えられます。大津の少なくとも2つのプロトタイプが構築された。Type 88 75mm AA銃とType 93 13mm重機械銃の2つのペアまたはType 98 20mm AA砲のペア(Depth Charge?)で武装している可能性があります。

 

コの
長さ:28.55メートル
ビーム:4.35メートル
深さ:2.25メートル

大津
長さ:26.83メートル
ビーム:4.00メートル
深さ:2.25メートル

 

ソース:

枢軸軍の歴史フォーラム:日本軍の軍艦と護衛

I find Type 5 Esrourt sip Ko document & Photos!

source from JACAR → Type 5 wooden big escort boat manual

Please read this post on this forum →  Type 5 Wooden big escort boat historical documents

 

I translate some part of research-report about Ha-gou Battle boat & Kuchiku-tei Type 4

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I have updated the Seni-Tei and Karo-Tei tabs in main post for the IJA based off of the documents translated by @aizenns (you have my thanks). I will update the tab for the Type 5 soon and move on to researching other escort ships should I have some time to do so.

 

It is interesting comparing the Type 2 and Type 4 Karo-Tei. The Type 4 is substantially faster and lighter with slightly better armament to boot. In the document for the Type 2 it notes differences between it and a Type 1. I wonder if there is a Type 3 as well and what their (Type 1 / Type 3) designs offer.

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Will we see IJN Kaibokan?  Coastal Defense Ships or Escorts.

 

https://en.wikipedia.org/wiki/Kaibōkan

 

http://www.combinedfleet.com/Kaibokan.htm

 

Unlike larger IJN vessels, IJN Kaibokans, Kusentais (sub chasers) and patrol vessels, while initially repatriated, were returned to Japan for the Maritime Safety Agency, the predecessor to the Japanese Coast Guard and JSMDF.

 

 

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I think it is likely. They will probably be the largest vessels on the list (Not too much longer compared to the sub-chasers, but certainly much heavier). 

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