MO-4

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Rank VI USSR | Premium | Golden Eagles
Su-25K Pack
ussr_mo_4.png
GarageImage MO-4.jpg
MO-4
AB RB SB
1.0 1.0 1.0
Research:2 900 Specs-Card-Exp.png
Purchase:700 Specs-Card-Lion.png
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Description

The MO-4 is a small submarine hunter built by the Soviet navy during WW2. It was the fourth development of the MO class, and around 250 vessels were built during the war. The MO-4 saw extensive duty during WW2, performing various roles such as anti-submarine operations, convoy escort, as well as supporting landing operations. The further development of the MO class led to the creation of the BMO class, with 66 vessels being built in 1945.

This vessel was introduced during Update 1.79 "Project X" when the Soviet fleet was implemented into the game. It is equipped with two 45 mm cannons and two 12.7 mm DShK machine guns, which are effective for destroying enemy boats and lightly armoured targets. It can also be equipped with 64 M-8 rockets, which are powerful enough to destroy anything at close range, regardless of whether the enemy is armoured or not. Additionally, you can equip it with BB-1 depth charges to deter or destroy enemy vessels attempting to approach from behind.

General info

Survivability and armour

Armourfront / side / back
Hull38 mm (wood)
Superstructure10 mm (wood)
Number of section4
Displacement52 t
Crew22 people

MO-4 has the following structural layout:

  • Hull: 38 mm, wood
  • Superstructure: 10 mm, wood

The MO-4 is not armoured at all, and can be easily destroyed by even a rank 1 ship at close range. Ammo stores lay in the front and rear of the ship, while the fuel tanks are in the centre, meaning that an enemy shot will have a good chance of hitting a critical component. The silver lining of the MO-4's survivability is that the engines are below the water line, and so they are somewhat harder to hit.

Mobility

Speedforward / back
AB67 / 26 km/h
RB50 / 19 km/h
Mobility Characteristics
Game Mode Upgrade Status Maximum Speed (km/h) Turn Time (s) Turn Radius (m)
Forward Reverse
AB Stock 49 19
Upgraded 67 26
RB/SB Stock 43 17
Upgraded 50 19

The MO-4 is relatively mobile for a ship of its size, with a top speed of 50 km/h in RB and 67 km/h in AB. While this is far slower than the MTBs at the same BR, it is quite adequate for a ship of its size, and is enough to get the MO-4 where it needs to be. Furthermore, the MO-4 is relatively snappy in terms of controls and turns relatively quickly, meaning that it is overall quite nimble.

Modifications and economy

Repair costBasic → Reference
AB97 → 122 Sl icon.png
RB153 → 192 Sl icon.png
Total cost of modifications3 170 Rp icon.png
970 Sl icon.png
Talisman cost190 Ge icon.png
Crew training200 Sl icon.png
Experts1 000 Sl icon.png
Aces20 Ge icon.png
Research Aces96 000 Rp icon.png
Reward for battleAB / RB / SB
20 / 20 / 100 % Sl icon.png
100 / 100 / 100 % Rp icon.png
Modifications
Seakeeping Unsinkability Firepower
Mods new ship hull.png
Dry-Docking
Research:
150 Rp icon.png
Cost:
45 Sl icon.png
55 Ge icon.png
Mods new ship rudder.png
Rudder Replacement
Research:
110 Rp icon.png
Cost:
35 Sl icon.png
40 Ge icon.png
Mods new ship screw.png
Propeller Replacement
Research:
185 Rp icon.png
Cost:
55 Sl icon.png
70 Ge icon.png
Mods new ship engine.png
Engine Maintenance
Research:
195 Rp icon.png
Cost:
60 Sl icon.png
70 Ge icon.png
Mods ship damage control crew.png
Damage Control Division
Research:
150 Rp icon.png
Cost:
45 Sl icon.png
55 Ge icon.png
Mods ship fire control crew.png
Fire Division
Research:
110 Rp icon.png
Cost:
35 Sl icon.png
40 Ge icon.png
Mods engine smoke screen system.png
Smokescreen
Research:
110 Rp icon.png
Cost:
35 Sl icon.png
40 Ge icon.png
Mods new ship pumps.png
New Pumps
Research:
195 Rp icon.png
Cost:
60 Sl icon.png
70 Ge icon.png
Mods tank ammo.png
45mm_ussr_21k_o240_naval_he_ammo_pack
Research:
150 Rp icon.png
Cost:
45 Sl icon.png
55 Ge icon.png
Mods tank ammo.png
12mm_dshk_navy_he_ammo_pack
Research:
150 Rp icon.png
Cost:
45 Sl icon.png
55 Ge icon.png
Mods new aux caliber turrets.png
Auxiliary Armament Targeting
Research:
110 Rp icon.png
Cost:
35 Sl icon.png
40 Ge icon.png
Mods tank ammo.png
45mm_ussr_21k_naval_ap_ammo_pack
Research:
110 Rp icon.png
Cost:
35 Sl icon.png
40 Ge icon.png
Mods tank ammo.png
12mm_dshk_navy_ap_ammo_pack
Research:
110 Rp icon.png
Cost:
35 Sl icon.png
40 Ge icon.png
Mods new main caliber turrets.png
Primary Armament Targeting
Research:
185 Rp icon.png
Cost:
55 Sl icon.png
70 Ge icon.png
Mods ship rangefinder.png
Improved Rangefinder
Research:
185 Rp icon.png
Cost:
55 Sl icon.png
70 Ge icon.png
Mods depth charge.png
Depth Charges
Research:
185 Rp icon.png
Cost:
55 Sl icon.png
70 Ge icon.png
Mod arrow 0.png
Mods he frag base fuse tank.png
45mm_ussr_21k_naval_base_fuse_he_ammo_pack
Research:
195 Rp icon.png
Cost:
60 Sl icon.png
70 Ge icon.png
Mods rocket launcher.png
Rocket Launcher
Research:
195 Rp icon.png
Cost:
60 Sl icon.png
70 Ge icon.png
Mods rocket launcher.png
Rocket Launcher
Research:
195 Rp icon.png
Cost:
60 Sl icon.png
70 Ge icon.png
Mods ship art support.png
Artillery Support
Research:
195 Rp icon.png
Cost:
60 Sl icon.png
70 Ge icon.png

Armament

Primary armament

2 х Turret45 mm/68 21-KM cannon
Ammunition500 rounds
Vertical guidance-7° / 85°

This ship has access to two manual 45 mm cannons that can use AP ammo (for use against armoured boats) and three types of HE ammo. The default one and one of the unlockable ones (OR-73A and F-73 respectively) can be used to hit distant targets due to their greater muzzle velocity. The O-240 HE shell has greater explosive filler, but lower muzzle velocity, and so is more effective at closer range.

However, these guns leave the crew exposed due to the lack of armour, so even enemy machine guns can incapacitate these guns. As such, try to stay at range to prevent this from happening.

Penetration statistics
Ammunition Type of
warhead
Penetration @ 0° Angle of Attack (mm)
100 m 1,000 m 2,000 m 3,000 m 4,000 m 5,000 m
OR-73A HET HE 3 3 3 3 3 3
O-240 HE HE 5 5 5 5 5 5
BR-240 APHE 86 62 44 31 22 16
F-73 HE 23 17 12 8 6 4
Shell details
Ammunition Type of
warhead
Velocity
(m/s)
Projectile
mass (kg)
Fuse delay Fuse sensitivity
(mm)
Explosive mass
(TNT equivalent) (g)
Ricochet
0% 50% 100%
OR-73A HET HE 835 1.41 0 0.1 56.98 79° 80° 81°
O-240 HE HE 343 2.14 0 0.1 181.72 79° 80° 81°
BR-240 APHE 835 1.42 1 m 1.5 27.72 47° 60° 65°
F-73 HE 835 1.41 0.015 s 0.1 113.96 79° 80° 81°

Secondary armament

2 х Turret12.7 mm DShK machine gun
Ammunition2000 rounds
Belt capacity50 rounds
Fire rate600 shots/min
Main article: DShK (12.7 mm)

The anti-air armaments of the MO-4 consist of a total of two 12.7 mm DShK machine guns. These guns should be primarily against the aircraft, which are relatively easy to take down at BR 1.7, but they can also be used against the lightly-armoured boats that are still present at this battle rating (such as the LS 3). The guns are positioned in the middle section of the ship, which should pose no problems against aircraft because at least one gun can be placed onto the enemy aircraft, but it can be hard to attack boats directly in front of the ship.

  • Universal: AP-I · API-T · IAI
  • 12.7 mm HE belts: IAI · IAI · IAI · API-T
  • 12.7 mm APIT belts: API-T · AP-I · IAI · AP-I

Penetration statistics
Ammunition Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
AP-I 30 29 25 21 18 15
API-T 29 28 24 20 17 14
IAI 3 2 2 2 2 2
Shell details
Ammunition Velocity
(m/s)
Projectile
mass (kg)
Fuse delay
(m)
Fuse sensitivity
(mm)
Explosive mass
(TNT equivalent) (g)
Ricochet
0% 50% 100%
AP-I 850 0.05 - - - 47° 56° 65°
API-T 850 0.05 - - - 47° 56° 65°
IAI 850 0.05 0 0.1 1.5 47° 56° 65°

Additional armament

Setup 18 x BB-1 depth charge
Setup 264 x 82 mm M-8 rocket
Setup 364 x 82 mm M-8 rocket
8 x BB-1 depth charge
Main articles: BB-1 depth charge, M-8

One big firepower improvement on the MO-4 is the ability to equip the M-8 rockets. With a total of 64 rockets (32 on the deck ready to use), this ship can destroy almost anything, armoured or not, at very close range. While this ship should not be used at close range due to the lack of protection, rockets can be used in a last ditch effort to defeat rushing enemies or if in need of a quick-reacting weapon to surprise-attack someone. Do not underestimate the psychological effect of the rockets on newer player that may try to run away, seeing/hearing them.

Usage in battles

The MO-4 has dangerous long-range firepower at a very low battle rating, but limited defence against fast and evasive enemies and air power. Accordingly, the MO-4 should fight conservatively at the longest possible range the crew's gunnery skill could reach. At this battle rating, very few opponents will have large-calibre guns that can compete at range, and even fewer players will be able to target them effectively, so use that to the ship's advantage.

The MO-4 has two 45 mm cannons, with one on the bow and one on the stern. These weapons are not fully automatic, but pack a very significant punch for the battle rating. Indeed, they are very capable of ripping apart any vessels at the MO-4's BR, from larger patrol ships to smaller MTBs. Note that these weapons have a longer effective range than most other weapons that the MO-4 commonly faces, meaning that the ship can be used in a "sniper" playstyle. This means that the ship should stay 2-3 km away from any enemies, and snipe enemy light vessels using its powerful armament. This way, the MO-4 can make good use of its powerful armament without being heavily damaged by enemy vessels.

Since the MO-4 does not have good anti-air defence, with only two 12.7 mm DShK machine guns for the job, it should be used as a first spawn ship; otherwise stay close to allies with good anti-air defences to extend its lifespan. The two DShK machine guns aren't good at longer ranges due to their short effective range (~1.5 km) but are highly effective against enemy vessels at short ranges. These weapons can put out a decent amount of damage when used correctly. Finally, note that the MO-4 gets access to M-8 unguided rockets. These weapons aren't effective against fast light vessels, but are highly effective against larger, slower vessels. Feel free to use these weapons when necessary, especially if being overwhelmed at closer ranges. The rockets pack a massive punch and will easily destroy any ships the MO-4 faces.

Pros and cons

Pros:

  • Two large 45 mm cannons on the bow and stern of the ship
  • Two secondary 12.7 mm DShK machine guns possess a good field of range, provide some air cover
  • Four rocket pods on the bow of the ship deal huge damage up close and swivel to allow rockets to be fired in all directions except directly backward

Cons:

  • Primary cannons have a low rate of fire
  • Turrets have low turning speed
  • Crew are incapacitated very easily due to lack of armour
  • Good speed requires the purchase of all sea keeping modules
  • Wooden hull can easily catch on fire

History

The MO-4 (Russian: Малый Охотник, Malyj Okhotnik, English: Small Hunter) was a class of small submarine chasers built by the Soviet navy during the Second World War. The ships were designed for anti-submarine warfare as well as coastal patrol, though their duties varied during the course of the Second World War. The MO-4 class was the most numerous variant of the basic MO design, with approximately 250 ships built. The ships were built between 1937 and 1943, and served extensively during the Second World War.

The MO-4 was the 4th development of the MO class of guard ships, following the MO-1, MO-2 and MO-3 classes. However, in terms of production size, it dwarfed the previous classes, with roughly 250 ships produced compared to roughly 40 ships of the previous three classes. The MO-4s sported a main armament of two 45 mm 21-K cannons, one each mounted fore and aft of the bridge. As well, the ship carried two single DShK heavy machine guns. The MO-4 class sub-chasers were not fitted with torpedo armament, but rather, depth charges for it's anti-submarine role.

The MO-4 class of sub chasers saw extensive duty during the Second World War, not only in its anti-submarine role, but in various other roles as well. The ships were designed to be small and versatile, and as such, they were used for a variety of purposes including convoy escort and landing support. Two MO type sub chasers (MO-103 and MO-144) sank one U-Boat each, while other MO-4 boats destroyed small surface ships and aircraft. The MO-4 class would also lend its design to the later BMO (the B standing for "armoured"), of which 66 were produced in 1945.

Media

Skins
Videos

See also

Links to articles on the War Thunder Wiki that you think will be useful for the reader, for example:

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

External links


USSR boats
Motor torpedo boats  D-3 · G-5 · G-5 (ShVAK) · Pr.123-bis · Pr.123K (A-11) · Pr.123K · Pr.183
Motor gun boats  TKA-106 · MO-4 · OD-200 · Pr.183 BM-21 · Ya-5M
Motor torpedo gun boats  Pr. 206 · Pr.206-M · MPK Pr.12412 · MPK Pr.12412P
Gunboats  Groza
Armoured gun boats  BMO · MBK-161 early · MBK-161 late · MBK pr.186 · MBK pr.186 (MK 85) · Pr.1124 early · Pr.1124 late · Pr.1124 MLRS
  Pr.191 · Pr.191M · Pr.1204 · Pr.1204 late