Type 4 (Mod 4)

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Rank VI USA | Premium | Golden Eagles
A-10A Thunderbolt (Early)
This page is about the Japanese motor gun boat Type 4 (Mod 4). For the other version, see Type 4 (mod. 2).
Type 4 (Mod 4)
GarageImage Type 4 (Mod 4).jpg
ArtImage Type 4 (Mod 4).png
Type 4 (Mod 4)
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The Type 4 (Mod 4), Kuchiku-Tei Ka-Ro is a premium rank II Japanese motor gun boat with a battle rating of 1.7 (AB/RB/SB). It was introduced in Update 1.91 "Night Vision".

The Type 4 (Mod 4) is a modified version of the Type 4 riverine patrol boat of the Imperial Japanese Army, outfitted with two Nakajima Kotubuki 41 engines derived from the Ki-27 fighters at the stern instead of a petrol engine-powered propeller blades, essentially converting it into an airboat for use in the shallow waters and swampy terrains of China. Compared to its original version, the Type 4 Model 4 is twice as fast, yet has very poor stability in rough sea conditions.

General info

Survivability and armour

Armourfront / side / back
Hull40 mm (wood)
Superstructure15 mm (wood)
Number of section3
Displacement17 t
Crew13 people

The Model 4 is protected by the standard 40 mm of wood making up the hull, which doesn't offer much actual protection overall. All but the smallest weapons will be able to cause structural damage at most combat ranges, and the vast majority of weapons will be able to penetrate the hull to damage internal components. Of note however are this boats engines- it has three, one conventional engine in the hull of the boat, with two additional exposed aircraft engines towards the back of the deck, this gives it more speed but as the engines are exposed, they're very weak to fire, one or two cannon shots will render them out of action; on the plus side however, these engines are still small targets and hard to hit, so as long as you're not making yourself an easy target they shouldn't catch too much fire.


Speedforward / back
AB94 / 19 km/h
RB70 / 14 km/h
Mobility Characteristics
Game Mode Upgrade Status Maximum Speed (km/h) Turn Time (s) Turn Radius (m)
Forward Reverse
AB Stock ___ ___
Upgraded 94 19
RB/SB Stock ___ ___
Upgraded 70 14

The Model 4 is very impressive mobility-wise, it can reach 71 km/h in RB modes, and 107 km/h in AB modes, making it one of the fastest Japanese vessels overall. Due to its airboat configuration, it is also very responsive to control inputs, and will turn and accelerates very quickly, meaning that if need be, you can turn a full 180 degrees and retreat instead of reversing, as long as the speed is kept high this vessel will remain very manoeuvrable.

However, due to the Model 4 was designed specifically for swampy terrain, the boat has very shallow draught, this results into poor hull stability in rougher sea conditions and affecting the accuracy of the weapons in the process.

Modifications and economy

Repair cost
AB462 Sl icon.png
RB936 Sl icon.png
Crew training3 400 Sl icon.png
Experts23 000 Sl icon.png
Aces180 Ge icon.png
Research Aces380 000 Rp icon.png
Reward for battleAB / RB / SB
Talisman.png 2 × 60 / 80 / 50 % Sl icon.png
Talisman.png 2 × 118 / 118 / 118 % Rp icon.png
Seakeeping Unsinkability Firepower
Mods new ship hull.png
Mods new ship rudder.png
Rudder Replacement
Mods new ship screw.png
Propeller Replacement
Mods new ship engine.png
Engine Maintenance
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Damage Control Division
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Fire Division
Mods engine smoke screen system.png
Mods new ship pumps.png
New Pumps
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Mods tank ammo.png
Mods new aux caliber turrets.png
Auxiliary Armament Targeting
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Mods new main caliber turrets.png
Primary Armament Targeting
Mods depth charge.png
Depth Charges
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Artillery Support


Primary armament

Turret37 mm Type 4 naval cannon
Ammunition1000 rounds
Vertical guidance-7° / 30°
Type 4 Model 4 (2).jpg
Main article: Type 4 (37 mm)

The Model 4 uses the Type 4 37 mm naval cannon as its primary weapon, it has a relatively quick reload but an overall unimpressive damage output. It has access to two types of ammunition.

  • HE - High explosive, adequate damage output for the calibre of gun.
  • APHE - Armour piercing high explosive, very little viability- little to no damage output unless striking a critical component multiple times.

Overall the HE is the round to main when playing the Model 2, the APHE just doesn't do enough reliable damage to make it worth using as a primary round, the HE will cause much more damage structurally. It's only really viable to use at closer ranges as well, it's not the easiest gun to aim at long range and at close range the secondary 20 mm cannon will be a more reliable weapon, even against armoured targets.

Penetration statistics
Ammunition Type of
Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
37 mm HE HE 3 3 3 3 3 3
37 mm APHE APHE 47 45 37 29 23 18
Shell details
Ammunition Type of
mass (kg)
Fuse delay
Fuse sensitivity
Explosive mass
(TNT equivalent) (g)
0% 50% 100%
37 mm HE HE 677 0.65 0 0.1 69.3 79° 80° 81°
37 mm APHE APHE 662 0.7 1 3 11 47° 60° 65°

Secondary armament

Turret2 x 20 mm Type 98 autocannon
Ammunition4000 rounds
Belt capacity20 rounds
Fire rate300 shots/min
Main article: Type 98 (20 mm)

The Model 4 is equipped with twin 20 mm Type 98 cannons for its secondary weapon. These cannons perform very well against aircraft and boats alike, however they can only fire to the sides of the boat, due to the bridge and exposed engines blocking the line of fire. All in all, its a modestly powerful weapon and more reliable than the primary 37 mm gun. It works well at close range, and can function adequately up to around 1,500 m, but at this distance it will struggle to do a lot of damage. The magazine contains 20 rounds and reloads very quickly, allowing for a steady stream of fire against enemy vessels or aircraft. It comes with three belts-

  • Universal: HEF-T · AP-T · HEF-T · AP-T
  • HET: HEF-T · HEF-T · HEF-T · AP-T
  • APT: AP-T · AP-T · AP-T · HEF-T

Overall, the HET type rounds do the most damage consistently to most of the vessels you'll be coming across, so it's best to take a lot of HET belts, though also consider bringing some armour piercing belts in case you come across some more heavily armoured boats, as the 20 mm has more penetration with its AP rounds than the APHE shell on the 37 mm primary.

Penetration statistics
Ammunition Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
HEF-T 2 2 2 2 2 2
AP-T 41 38 28 19 13 9
Shell details
Ammunition Velocity
mass (kg)
Fuse delay
Fuse sensitivity
Explosive mass
(TNT equivalent) (g)
0% 50% 100%
HEF-T 950 0.13 0 0.1 6.17 79° 80° 81°
AP-T 928 0.13 - - - 47° 60° 65°

Additional armament

Setup 110 x Type 95 depth charge
Main article: Type 95 depth charge

The Model 4 can carry ten Type 95 depth charges, which can be dropped to maim other naval targets, they have rather limited viability though as most MTBs will be able to outrun the explosion, however they are useful for attacking larger ships, as if you can reach them unnoticed one or two of these depth charges will sink the vessel.

Usage in battles

The Type 4 Model 4 engaging an enemy vessel

Despite the impressive speed of the Model 4, being too aggressive with it will often prove fatal, its survivability overall is fairly poor, so you really don't want to get caught out. You're going to want to use the twin 20 mm cannons as your primary weapon as they are by far superior to the 37 mm, and because of this you'll need to plan your route through the map carefully. Due to the deadzones in the fire arc of the 20 mm cannons you need to be mindful of where enemies could be engaging you from, one of the worst situations you can find yourself in while playing this boat is running into an enemy head on at close range, you'll need to turn to fire upon your enemy and by this time they will likely have a few seconds to fire upon you, and these few seconds are often fatal.

If you're playing on a map with lots of narrow sight lines, try to avoid sailing directly for them, and instead sail at an angle in their general direction, this way- if an enemy vessel appears from one of these choke points you'll instantly be able to fire upon them, as your boat is fairly weak, you need to minimise all forms of damage dealt towards you, so it's imperative you make sure enemies aren't going to engage you from the front or the back if at all possible.

A good playstyle for this boat is patrolling, using your impressive mobility to sail back and forth across a wide area, keeping an eye on the sight lines and choke points enemies could be coming from, try to avoid areas where enemies could get close to you, as the closer they are the more potential damage you'll take, and the deadzones for your guns will be more of a hindrance, close quarters is the last place you want to be engaging enemies. An ideal range of engagement is around 800-1,000 m, where you can easily make slight turns to allow your cannons more time on target, additionally at this range your engines will be a lot harder to hit, allowing you to stay in the fight longer.

Pros and cons

The Type 4 Model 4


  • Very fast and responsive in manoeuvres
  • Accelerates and decelerates very quickly due to its airboat configuration, giving the boat excellent reflexive mobility
  • Very potent secondary armament
  • Despite how weak they are, the engines are hard to hit


  • Poor firing arc for the 20 mm cannons
  • Ineffective primary weapon performance
  • Shallow draught results into poor hull stability, the boat will rock constantly unless in calm sea condition
  • Very weak exposed engines
  • Struggles when up-tiered


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See also

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  • reference to the series of the ship;
  • links to approximate analogues of other nations and research trees.

External links

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Japan boats
Motor torpedo boats  Type T-1 · Type T-14 · Type T-14 (mod. 1) · Type T-38 · Type T-51a · Type T-51b · PT-15 · PT-808
Motor gun boats  Ha-Go (mod. 1) · Type 4 (mod. 2) · Type 4 (Mod 4) · Asagao (YTE-01) · PG 02
Armoured gun boats  Soukou-Tei · Soukou-Tei No.4
Gunboats  Chidori

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
Frigates  Akebono
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
Battleships  IJN Yamashiro