Type K-8 No.13
|This page is about the Japanese sub-chaser Type K-8 No.13. For the other version, see Type K-8 No.13 late.|
The Type K-8 No.13, Kusentei is a premium gift rank II Japanese sub-chaser with a battle rating of 1.7 (AB/RB/SB). It was introduced during Update "Hot Tracks" as a reward for the 2020 Operation W.I.N.T.E.R. event.
Survivability and armour
The Type K-8 No.13, Kusentei's primary characteristic is her exceptional survivability for the battle rating. With a crew count of 68, 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 No.13 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.
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.
|Game Mode||Upgrade Status||Maximum Speed (km/h)|
Modifications and economy
The Type K-8 No.13'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 knock out 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. Targeting 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.
|Ammunition|| Type of
|Penetration @ 0° Angle of Attack (mm)|
|100 m||1,000 m||2,000 m||3,000 m||4,000 m||5,000 m|
|Type 0 HE||HE||8||8||8||8||8||8|
|Type 0 HE||HE-TF||8||8||8||8||8||8|
|Ammunition|| Type of
| Fuse delay
| Fuse sensitivity
| Explosive mass
(TNT equivalent) (g)
|Type 0 HE||HE||685||5.99||0||0.1||480||79°||80°||81°|
|Type 0 HE||HE-TF||685||5.99||0||0.1||480||79°||80°||81°|
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 25 mm HEI bears 15.3 g TNT.
The more familiar with the K-8 will realize that on the 1942 refit there are no 25 mm to be spotted unlike on the Type K-8 No.13 late which would only get the anti-air package late in the war.
- Universal: · · ·
- AP-T: · · ·
- HEIT: · · ·
|Ammunition||Penetration @ 0° Angle of Attack (mm)|
|10 m||100 m||500 m||1,000 m||1,500 m||2,000 m|
| Fuse delay
| Fuse sensitivity
| Explosive mass
(TNT equivalent) (g)
Describe the available additional armaments of the ship: depth charges, mines, torpedoes. Talk about their positions, available ammunition and launch features such as dead zones of torpedoes. If there is no additional armament, remove this section.
Usage in battles
The primary role of the 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.
With the benefit of being a whole battle rating lower compared the 1944 refit, it has an easier time engaging targets and lighter targets to shoot at which will perish with most of the 8cm gun's hits.
Pros and cons
- Excellent survivability
- Good armament
- 360° weapon coverage
- Main gun able to engage aircraft
- Slow speed and low manoeuvrability
- Large target
- Single dedicated anti-air mount
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.
Ships of class
|Name||Completed||Fate at the end of the war|| Dismantled|
|No. 13||1940-07-15||Sunk||Submarine, USS Pickerel (SS-177)||1943-04-03|
|No. 17||1941-07-31||Sunk||Submarine, USS Springer (SS-414)||1945-04-28|
|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. 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.
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 1,000 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.
Ships of comparable role, configuration and era
|Nippon Kokan Co. ()|
|Sub Chasers ()|
|No.13 Type||Type K-8 No.13* · Type K-8 No.13 late*|
|*Previously Tsurumi Iron Works|
|Japan premium ships|
|Motor torpedo boats||Type T-14 (mod. 1) · Type T-51a|
|Motor gun boats||Type 4 (Mod 4) · PG 02|
|Sub-chasers||Type K-8 No.13|
|Destroyers||IJN Satsuki · IJN Nenohi · IJN Hayanami · IJN Kiyoshimo · IJN Yuudachi · JDS Yūgure (DD-184)|
|Light cruisers||IJN Yubari · IJN Mikuma|
|Heavy cruisers||IJN Myoko|