Difference between revisions of "Type K-8 (1944)"

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''If necessary, use a graphics template to show the most well-protected or most vulnerable points in the armour.''-->
 
''If necessary, use a graphics template to show the most well-protected or most vulnerable points in the armour.''-->
The {{specs|name}}'s primary characteristic is her exceptional survivability for the BR. With a crew count of {{specs|crew}} she's got nearly the double of the second-best vessel, and nearly 7 times the crew count of any US vessel in this BR. She's also the only ship within her BR to have 7 hull sections, at least one more than all the other ships. Overall this gives her an outstanding ability to survive even a focused gun fire from multiple boats.
+
The {{specs|name}}'s primary characteristic is her exceptional survivability for the battle rating. With a crew count of {{specs|crew}}, she's got nearly the double of the second-best vessel, and nearly 7 times the crew count of any US vessel in this battle rating. She's also the only ship within the battle rating to have 7 hull sections, at least one more than all the other ships. Overall this gives her an outstanding ability to survive even a focused gun fire from multiple boats.
  
That said though - she has some weak points to her survivability. First of all, she has one of the thinnest armour layers, making it impossible to deflect even the lowest calibre guns at nearly any range. Secondly her primary gun is fully exposed, leading to it being often disabled under enemy fire. And lastly her ammunition storage is exposed fully over the water level, directly under the primary gun, making for a significant chances of ammo-racking the ship.
+
That said though - the {{PAGENAME}} has some weak points to her survivability. First of all, she has one of the thinnest armour layers, making it impossible to deflect even the lowest calibre guns at nearly any range. Secondly her primary gun is fully exposed, leading to it being often disabled under enemy fire. And lastly her ammunition storage is exposed fully over the water level, directly under the primary gun, making for a significant chances of ammo-racking the ship.
  
 
=== Mobility ===
 
=== Mobility ===
 
<!--''Write about the ship’s mobility. Evaluate its power and manoeuvrability, rudder rerouting speed, stopping speed at full tilt, with its maximum forward speed and reverse speed.''-->
 
<!--''Write about the ship’s mobility. Evaluate its power and manoeuvrability, rudder rerouting speed, stopping speed at full tilt, with its maximum forward speed and reverse speed.''-->
With the top speed of 33km/h she's a relatively large, lumbering target. It's not helped by an average rudder turning speed of 4.85s. Overall it's an attractive target for a torpedo attacks and a long-range gunnery fire.
+
With the top speed of 33km/h, she's a relatively large, lumbering target. It's not helped by an average rudder turning speed of 4.85s. Overall it's an attractive target for a torpedo attacks and a long-range gunnery fire.
  
 
== Armament ==
 
== Armament ==
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[[File:Type K-8 Type 3.jpg|thumb|left|The Type 3 cannon firing a visible HE shell]]
 
[[File:Type K-8 Type 3.jpg|thumb|left|The Type 3 cannon firing a visible HE shell]]
 
{{main|8 cm/40 Type 3 (76 mm)}}
 
{{main|8 cm/40 Type 3 (76 mm)}}
Ship's primary armament is a single 8cm Type 3 cannon. It's firing up to 20 shots/minute of Type 0 HE shells that are relatively potent, with 480g of TNT, being able to one-shot individual hull sections on most boats she'll encounter, but struggling with larger units like submarine chasers.
 
  
Gun was originally designed as a high-elevation one, historically being often mounted on a larger ships for an anti-aircraft duty. As a result her horizontal guidance is ±180° and vertical -7°/+75°, covering most of the field around the ship, with exception of the deadzone behind the conning tower, although the gun can still engage airborne targets by firing above it. Targetting speed is slow, just 9.4°/s, however it's sufficient to engage targets bar fast attack boats in an extremely short range where machine guns engage them anyway.
+
The {{PAGENAME}}'s primary armament is a single 8 cm Type 3 cannon. It can fire up to 20 shots/minute of Type 0 HE shells that are relatively potent, with 480 g of TNT, being able to one-shot individual hull sections on most boats she'll encounter, but struggling with larger units like submarine chasers.
 +
 
 +
The gun was originally designed as a high-elevation one, historically being often mounted on a larger ships for anti-aircraft duty. As a result, her horizontal guidance is ±180° and vertical -7°/+75°, covering most of the field around the ship with exception of the deadzone behind the conning tower, although the gun can still engage airborne targets by firing above it. Targetting speed is slow, just 9.4°/s, however it's sufficient to engage targets bar fast attack boats in an extremely short range where machine guns engage them anyway.
 
{{Clear|left}}
 
{{Clear|left}}
 +
 
=== Secondary armament ===
 
=== Secondary armament ===
 
<!--''Some ships are fitted with weapons of various calibres. The secondary armament is defined as the weapon chosen with the control <code>Select secondary weapon</code>. Evaluate the secondary armament and give advice on how to use them. Describe the ammunition available for the secondary armament. Provide recommendations on how to use them and which ammunition to choose. Remember that anti-air armament, even heavy calibre weapons, belong in the next section.''-->
 
<!--''Some ships are fitted with weapons of various calibres. The secondary armament is defined as the weapon chosen with the control <code>Select secondary weapon</code>. Evaluate the secondary armament and give advice on how to use them. Describe the ammunition available for the secondary armament. Provide recommendations on how to use them and which ammunition to choose. Remember that anti-air armament, even heavy calibre weapons, belong in the next section.''-->
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{{main|25 mm/60 Type 96 (25 mm)}}
 
{{main|25 mm/60 Type 96 (25 mm)}}
  
Same as the predecessors [[Type_K-3_/_No.1_Class|Type K-3]] and [[Type_K-7_/_No.4_Class|Type K-7]], this boat is equipped with three single mounting 25 mm Type 96 autocannons, which make for a very potent secondary weapons. The HE type rounds this gun fires have no trouble knocking out PT boats and even larger support vessels, sometimes even with one magazine all together. Alternatively AP racks can be used for handling armoured boats with a penetration of up to 37mm at 1000m range, which is more than enough to penetrate even hardened armor gun shield of German boats.
+
Same as the predecessors [[Type_K-3_/_No.1_Class|Type K-3]] and [[Type_K-7_/_No.4_Class|Type K-7]], this boat is equipped with three single mounting 25 mm Type 96 autocannons, which make for a very potent secondary weapons. The HE type rounds this gun fires have no trouble knocking out PT boats and even larger support vessels, sometimes even with one magazine all together. Alternatively, AP racks can be used for handling armoured boats with a penetration of up to 37mm at 1000m range, which is more than enough to penetrate even hardened armor gun shield of German boats.
  
 
Two of the cannons are placed on a platform in front of the smoke funnel, while the third one is located right behind the primary cannon, in a super-firing position. Additionally due to the HE these cannons can engage targets at range and still do damage. This cannon can also cause critical damage to aircraft with only a single hit.
 
Two of the cannons are placed on a platform in front of the smoke funnel, while the third one is located right behind the primary cannon, in a super-firing position. Additionally due to the HE these cannons can engage targets at range and still do damage. This cannon can also cause critical damage to aircraft with only a single hit.
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{{Clear|left}}
 
{{Clear|left}}
 
=== Special armament ===
 
=== Special armament ===
<!--''Depth charges, mines, rocket launchers and missiles are also effective in skilled hands and can take an off-guard opponent by surprise. Evaluate the ammunition of this type of armament and rate its performance in combat.''-->
 
 
{{main|Type 95 depth charge}}
 
{{main|Type 95 depth charge}}
 +
 +
''Depth charges, mines, rocket launchers and missiles are also effective in skilled hands and can take an off-guard opponent by surprise. Evaluate the ammunition of this type of armament and rate its performance in combat.''
  
 
== Usage in battles ==
 
== Usage in battles ==
 
<!--''Describe the technique of using this ship, the characteristics of her use in a team and tips on strategy. Abstain from writing an entire guide – don’t try to provide a single point of view, but give the reader food for thought. Talk about the most dangerous opponents for this vehicle and provide recommendations on fighting them. If necessary, note the specifics of playing with this vehicle in various modes (AB, RB, SB).''-->
 
<!--''Describe the technique of using this ship, the characteristics of her use in a team and tips on strategy. Abstain from writing an entire guide – don’t try to provide a single point of view, but give the reader food for thought. Talk about the most dangerous opponents for this vehicle and provide recommendations on fighting them. If necessary, note the specifics of playing with this vehicle in various modes (AB, RB, SB).''-->
Primary role of the Type K-8 is to lure enemy's attention away from more vulnerable targets. Being large, intimidating ship it will often be under fire of a number of enemy units. And often times it can freely survive those engagements, largely thanks to it's 8cm main gun packing powerful punch, although delivered at a low fire rate, and assisted by a number of secondaries at all angles.
+
 
 +
The primary role of the Type K-8 is to lure enemy's attention away from more vulnerable targets. Being large, intimidating ship it will often be under fire of a number of enemy units. And often times it can freely survive those engagements, largely thanks to its 8cm main gun packing powerful punch, although delivered at a low fire rate, and assisted by a number of secondaries at all angles.
  
 
=== Pros and cons ===
 
=== Pros and cons ===
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<!--''Describe the history of the creation and combat usage of the ship in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the vehicle and adding a block "/ History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></nowiki></code>, as well as adding them at the end of the article.''-->
 
<!--''Describe the history of the creation and combat usage of the ship in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the vehicle and adding a block "/ History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></nowiki></code>, as well as adding them at the end of the article.''-->
  
Submarine chasers of the project number K8, also known as the No.13-class submarine chasers (第十三号型駆潜艇, Dai 13 Gō-gata Kusentei) were built under Maru 4 Keikaku programme, totalling 15 ships built from 1940 till 1942. The primary principle of the design was to build capable ships quickly and cheaply. Resulting design was using cheaper, more common steel used on a merchant ships, nor military units. But an additional reinforcements created a notably sturdier hull, what also helped avoiding secondary vibrations due to the sonar. Furthermore the ship had an increased ballast, lowered centre of gravity and an increased hull width what resulted in a ship having displacement roughly 1.5 times the one of its predecessor, the [[Type K-7 / No.4 Class|No.4-class]].
+
Submarine chasers of the project number K8, also known as the No.13-class submarine chasers (第十三号型駆潜艇, Dai 13 Gō-gata Kusentei), were built under Maru 4 Keikaku programme, totalling 15 ships built from 1940 till 1942. The primary principle of the design was to build capable ships quickly and cheaply. The resulting design used cheaper, more common steel found on merchant ships, not military units. But an additional reinforcements created a notably sturdier hull, which also helped avoiding secondary vibrations due to the sonar. Furthermore, the ship had an increased ballast, lowered centre of gravity and an increased hull width what resulted in a ship having displacement roughly 1.5 times the one of its predecessor, the [[Type K-7 / No.4 Class|No.4-class]].
  
 
===Ships of class===
 
===Ships of class===
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|  
 
|  
 
|  
 
|  
| 1948
+
| 1948-04-23
 
|-
 
|-
 
| No. 16
 
| No. 16
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|  
 
|  
 
|  
 
|  
| 1948
+
| 1948-05-04
 
|-
 
|-
 
| No. 21
 
| No. 21
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|}
 
|}
  
''No. 13'' and ''No. 13'' took part in a hunt for USS Nautilus (SS-168) in June 1942, damaging the submarine with depth charges and forcing it back to Perl Harbor for month-long repairs. The ''No. 27'' was likely the last victim of the USS Grunion, before it sunk 4 days later. ''No. 18'' sunk USS Amberjack (SS-219) on 16 February 1943. In October 1943 ''No. 15'' took part in the sinking of submarine USS Wahoo (SS-238). On 14 November 1943 the ''No. 20'' engaged in a gunnery duel with the HMS Taurus (P399), with the submarine hitting the bridge of the chaser with the QF 4-inch Mk IV (102 mm) gun, killing the captain and most of the crew onboard. The ship suffers a number of other hits that eventually flood her engine room forcing the ship to be towed back into the port for repairs. The submarine returned back to the port undamaged, despite ''No. 20'''s crew claiming a direct hull hit and dropping a number of depth charges.
+
''No. 13'' and ''No. 13'' took part in a hunt for USS Nautilus (SS-168) in June 1942, damaging the submarine with depth charges and forcing it back to Pearl Harbor for month-long repairs. The ''No. 27'' was likely the last victim of the USS Grunion, before the latter was sunk 4 days later. ''No. 18'' sunk USS Amberjack (SS-219) on 16 February 1943. In October 1943, ''No. 15'' took part in the sinking of submarine USS Wahoo (SS-238). On 14 November 1943, the ''No. 20'' engaged in a gunnery duel with the HMS Taurus (P399), with the submarine hitting the bridge of the chaser with its QF 4-inch Mk IV (102 mm) gun, killing the captain and most of the crew onboard. The ship suffers a number of other hits that eventually flood her engine room forcing the ship to be towed back into the port for repairs. The submarine returned back to the port undamaged, despite ''No. 20'''s crew claiming a direct hull hit and dropping a number of depth charges.
  
8 August 1945 marks the most successful anti-aircraft duty of the class, with the ''No. 19'' damaging six out of fourteen [[B-25 (Family)|B-25]] bombers trying to strife it in the Tsushima Strait between Japan and South Korea. The ship survives the encounter and returns back to the Kure port, about 20 km away from Hiroshima just days after the atomic bombing.
+
08 August 1945 marks the most successful anti-aircraft duty of the class, with the ''No. 19'' damaging six out of fourteen [[B-25 (Family)|B-25]] bombers trying to strafe it in the Tsushima Strait between Japan and South Korea. The ship suffered one bomb hit, but survives the encounter and returns back to the Kure port, about 20 km away from Hiroshima just days after the atomic bombing.
  
Ships of the class also participated in a number of rescue operations, such as ''No. 17'' and ''No. 18'' rescuing of nearly 400 survivors of the bombing of a Naples Maru troop transport or No. 20 rescuing 622 survivors after an attack on a convoy departing from the Musa Bay in the September 1944.  
+
Ships of the class also participated in a number of rescue operations, such as ''No. 17'' and ''No. 18'' rescuing of nearly 400 survivors of the bombing of a Naples Maru troop transport or No. 20 rescuing 622 survivors after an attack on a convoy departing from the Musa Bay in the September 1944.
  
 
===22-GO Radar===
 
===22-GO Radar===
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It was designed as a search radar. First test phase was done onboard battleship Hyūga in May 1942, with further testing proceeding onboard Yamato in July 1943. It went through a number of updates, eventually reaching nearly 1000 units produced by the end of the war. The mass deployment begin in July 1944, eventually reaching most of the Japanese naval units. After the war, radars found their use onboard whaling vessels helping to mitigate the food shortage in the post-war period by ensuring a safe passage of the vessels between the icebergs in the northern seas.
 
It was designed as a search radar. First test phase was done onboard battleship Hyūga in May 1942, with further testing proceeding onboard Yamato in July 1943. It went through a number of updates, eventually reaching nearly 1000 units produced by the end of the war. The mass deployment begin in July 1944, eventually reaching most of the Japanese naval units. After the war, radars found their use onboard whaling vessels helping to mitigate the food shortage in the post-war period by ensuring a safe passage of the vessels between the icebergs in the northern seas.
  
Radar suffered from relatively low accuracy, making it not suitable for fire-control applications. It had an average range error of 160 m and an average bearing error of 2.26°. It was able to detect battleships at 35 km range, destroyers at 16 km and submarines at 5 km. Testing onboard Yamato also proved that the radar can detect a water column from Yamato's 155 mm secondary cannons from up to 15 km.
+
The radar suffered from relatively low accuracy, making it not suitable for fire-control applications. It had an average range error of 160 metres and an average bearing error of 2.26°. It was able to detect battleships at 35 km range, destroyers at 16 km and submarines at 5 km. Testing onboard Yamato also proved that the radar can detect a water column from Yamato's 155 mm secondary cannons from up to 15 km.
  
 
{{Clear|left}}
 
{{Clear|left}}

Latest revision as of 01:05, 2 February 2020

Type K-8 / No.13 Class, Kusentei (1944)
jp_kusen_tei_13_1944.png
AB
RB
SB
General characteristics
Brief
Detailed
2.7/2.7/2.7BR
80 peopleCrew
420 tDisplacement
7Number of section
6 mm (steel)Hull armor
4 mm (steel)Superstructure armor
Primary armament
8 cm/40 Type 3 cannonTurret
400 roundsAmmunition
-7° / 75°Vertical guidance
Secondary armament
25 mm/60 Type 96 automatic cannon3 x Turret
1 500 roundsAmmunition
15 roundsBelt capacity
261 shots/minFire rate
Anti-aircraft armament
2 x 13.2 mm Type 93 machine gunTurret
3 600 roundsAmmunition
30 roundsBelt capacity
476 shots/minFire rate
Additional armament
14 x Type 95 depth chargeSetup 1
64 x Type 95 depth chargeSetup 2
64 x Type 95 depth charge
14 x Type 95 depth charge
Setup 3
Economy
26 000 Rp icon.pngResearch
100 000 Sl icon.pngPurchase
Sl icon.png/1 220 / 1 565/1 020 / 1 308Repair
29 000 Sl icon.pngCrew training
100 000 Sl icon.pngExperts
500 Ge icon.pngAces
142 % Rp icon.pngReward for battle
100 % Sl icon.png130 % Sl icon.png110 % Sl icon.png

Description

GarageImage Type K-8 (1944).jpg


The Type K-8 / No.13 Class, Kusentei (1944) is a rank II Japanese sub-chaser with a battle rating of 2.7 (AB/RB/SB). It was introduced in Update 1.89 "Imperial Navy".

General info

Survivability and armour

Type K-8 can survive a few ships simultaneously creating a spectacle with all the shrapnel flying off.

The Type K-8 / No.13 Class, Kusentei (1944)'s primary characteristic is her exceptional survivability for the battle rating. With a crew count of 80, she's got nearly the double of the second-best vessel, and nearly 7 times the crew count of any US vessel in this battle rating. She's also the only ship within the battle rating to have 7 hull sections, at least one more than all the other ships. Overall this gives her an outstanding ability to survive even a focused gun fire from multiple boats.

That said though - the Type K-8 (1944) has some weak points to her survivability. First of all, she has one of the thinnest armour layers, making it impossible to deflect even the lowest calibre guns at nearly any range. Secondly her primary gun is fully exposed, leading to it being often disabled under enemy fire. And lastly her ammunition storage is exposed fully over the water level, directly under the primary gun, making for a significant chances of ammo-racking the ship.

Mobility

With the top speed of 33km/h, she's a relatively large, lumbering target. It's not helped by an average rudder turning speed of 4.85s. Overall it's an attractive target for a torpedo attacks and a long-range gunnery fire.

Armament

Primary armament

The Type 3 cannon firing a visible HE shell

The Type K-8 (1944)'s primary armament is a single 8 cm Type 3 cannon. It can fire up to 20 shots/minute of Type 0 HE shells that are relatively potent, with 480 g of TNT, being able to one-shot individual hull sections on most boats she'll encounter, but struggling with larger units like submarine chasers.

The gun was originally designed as a high-elevation one, historically being often mounted on a larger ships for anti-aircraft duty. As a result, her horizontal guidance is ±180° and vertical -7°/+75°, covering most of the field around the ship with exception of the deadzone behind the conning tower, although the gun can still engage airborne targets by firing above it. Targetting speed is slow, just 9.4°/s, however it's sufficient to engage targets bar fast attack boats in an extremely short range where machine guns engage them anyway.

Secondary armament

Two Type 96 automatic cannons on a platform have a wide firing arcs, being able to effectively engage most targets

Same as the predecessors Type K-3 and Type K-7, this boat is equipped with three single mounting 25 mm Type 96 autocannons, which make for a very potent secondary weapons. The HE type rounds this gun fires have no trouble knocking out PT boats and even larger support vessels, sometimes even with one magazine all together. Alternatively, AP racks can be used for handling armoured boats with a penetration of up to 37mm at 1000m range, which is more than enough to penetrate even hardened armor gun shield of German boats.

Two of the cannons are placed on a platform in front of the smoke funnel, while the third one is located right behind the primary cannon, in a super-firing position. Additionally due to the HE these cannons can engage targets at range and still do damage. This cannon can also cause critical damage to aircraft with only a single hit.

  • Universal belts: good balance between firepower and tracer contents, useful for newcomers to the Japanese 25 mm autocannon.
  • APT belts: Full of AP shells, it's recommended to take a few belts of AP in case you meet a Russian armoured river boat.
  • HEI belts: Trades tracer rounds for extra firepower, they're more efficient than Universal belts at knocking out PT boats and aircraft at the expense of price. Universal belts are free, while APT and HEI belts cost 5 Sl icon.png each.

Note that the autocannon in a front mount has significantly decreased guidance arc. While for the two guns on the platform amidship have horizontal guidance of ±180°, the front one has only -90°/+40°, which means that the guns have a relatively narrow arc where majority of the secondary guns can fire.

Anti-aircraft armament

Low-mounted dual Type 93 is relatively accurate and covers the entirety of the rear of the ship
Main article: Type 93 (13.2 mm)

Unlike predecessors, this boat have separate anti-aircraft armament which consists from twin Type 93 (13.2 mm) machine guns on a single mount at the rear of the ship. It has a notable advantage in vertical guidance over the Type 96 automatic cannons, being able to aim at targets up to +80° vs +65° for the Type 96. Also having nearly double the fire rate further increases its chances of landing successful shots at the enemy. That said though, even with two bullets hitting the enemy, the overall damage is much lower, with 13.2 mm HEI bullet bearing 1g TNT, while 25mm HEI bears 15.3g TNT.

Special armament

Main article: Type 95 depth charge

Depth charges, mines, rocket launchers and missiles are also effective in skilled hands and can take an off-guard opponent by surprise. Evaluate the ammunition of this type of armament and rate its performance in combat.

Usage in battles

The primary role of the Type K-8 is to lure enemy's attention away from more vulnerable targets. Being large, intimidating ship it will often be under fire of a number of enemy units. And often times it can freely survive those engagements, largely thanks to its 8cm main gun packing powerful punch, although delivered at a low fire rate, and assisted by a number of secondaries at all angles.

Pros and cons

Pros:

  • Excellent survivability
  • Good armament
  • 360° weapon coverage
  • Good anti-aircraft capability
  • Main gun able to engage aircraft

Cons:

  • Slow speed and low maneuverability
  • Large target
  • No torpedoes

History

Submarine chasers of the project number K8, also known as the No.13-class submarine chasers (第十三号型駆潜艇, Dai 13 Gō-gata Kusentei), were built under Maru 4 Keikaku programme, totalling 15 ships built from 1940 till 1942. The primary principle of the design was to build capable ships quickly and cheaply. The resulting design used cheaper, more common steel found on merchant ships, not military units. But an additional reinforcements created a notably sturdier hull, which also helped avoiding secondary vibrations due to the sonar. Furthermore, the ship had an increased ballast, lowered centre of gravity and an increased hull width what resulted in a ship having displacement roughly 1.5 times the one of its predecessor, the No.4-class.

Ships of class

Name Completed Fate at the end of the war Dismantled
post-war
Status By Date
No. 13 1940-07-15 Sunk Submarine, USS Pickerel (SS-177) 1943-04-03
No. 14 1941-03-31 Destroyed Aircraft 1945-07-28
No. 15 1941-03-31 Survived 1948-04-23
No. 16 1941-04-05 Sunk Aircraft 1944-07-04
No. 17 1941-07-31 Sunk Submarine, USS Springer (SS-414) 1945-04-28
No. 18 1941-07-31 Sunk Aircraft 1944-12-30
No. 19 1941-09-20 Survived 1948
No. 20 1941-08-20 Survived 1948-05-04
No. 21 1941-08-20 Survived 1947
No. 22 1941-10-12 Sunk Aircraft 1944-02-19
No. 23 1941-11-15 Survived 1948
No. 24 1941-12-20 Sunk Destroyer, USS Burns (DD-588) 1944-02-17
No. 25 1941-12-29 Sunk Submarine, USS Grunion (SS-216) 1942-07-15
No. 26 1941-12-20 Sunk Aircraft 1945-07-30
No. 27 1942-01-28 Sunk Submarine, USS Grunion 1942-07-16

No. 13 and No. 13 took part in a hunt for USS Nautilus (SS-168) in June 1942, damaging the submarine with depth charges and forcing it back to Pearl Harbor for month-long repairs. The No. 27 was likely the last victim of the USS Grunion, before the latter was sunk 4 days later. No. 18 sunk USS Amberjack (SS-219) on 16 February 1943. In October 1943, No. 15 took part in the sinking of submarine USS Wahoo (SS-238). On 14 November 1943, the No. 20 engaged in a gunnery duel with the HMS Taurus (P399), with the submarine hitting the bridge of the chaser with its QF 4-inch Mk IV (102 mm) gun, killing the captain and most of the crew onboard. The ship suffers a number of other hits that eventually flood her engine room forcing the ship to be towed back into the port for repairs. The submarine returned back to the port undamaged, despite No. 20's crew claiming a direct hull hit and dropping a number of depth charges.

08 August 1945 marks the most successful anti-aircraft duty of the class, with the No. 19 damaging six out of fourteen B-25 bombers trying to strafe it in the Tsushima Strait between Japan and South Korea. The ship suffered one bomb hit, but survives the encounter and returns back to the Kure port, about 20 km away from Hiroshima just days after the atomic bombing.

Ships of the class also participated in a number of rescue operations, such as No. 17 and No. 18 rescuing of nearly 400 survivors of the bombing of a Naples Maru troop transport or No. 20 rescuing 622 survivors after an attack on a convoy departing from the Musa Bay in the September 1944.

22-GO Radar

Two rotating antennas of the 22-GO radar

The two rotating devices on top of the conning tower of the Type K-8 are not acoustic listening devices, but rather a radar. Each of the two devices are built of a dipole antenna inside a large, cone-like horn antenna. Its designation is 22-GO (22号電探), also known as Navy Mark 2 Type 2 Radar. Colloquially it was called "Horns" among Americans and "Tuna" among Japanese sailors.

It was designed as a search radar. First test phase was done onboard battleship Hyūga in May 1942, with further testing proceeding onboard Yamato in July 1943. It went through a number of updates, eventually reaching nearly 1000 units produced by the end of the war. The mass deployment begin in July 1944, eventually reaching most of the Japanese naval units. After the war, radars found their use onboard whaling vessels helping to mitigate the food shortage in the post-war period by ensuring a safe passage of the vessels between the icebergs in the northern seas.

The radar suffered from relatively low accuracy, making it not suitable for fire-control applications. It had an average range error of 160 metres and an average bearing error of 2.26°. It was able to detect battleships at 35 km range, destroyers at 16 km and submarines at 5 km. Testing onboard Yamato also proved that the radar can detect a water column from Yamato's 155 mm secondary cannons from up to 15 km.

Media

See also

Ships of comparable role, configuration and era

External links


Japan sub-chasers
Type 4 Model 2 · Type 4 Model 4 · Type K-3 / No.1 Class · Type K-7 / No.4 Class · Type K-8 (1944) · Chikugo · Syonan