M109A1

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This page is about the American tank destroyer M109A1. For other versions, see M109 (Family).
M109A1
us_m109a1.png
GarageImage M109A1.jpg
ArtImage M109A1.png
M109A1
AB RB SB
6.3 6.3 6.3
Research:46 000 Specs-Card-Exp.png
Purchase:155 000 Specs-Card-Lion.png
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Description

The M109A1 was introduced into American service in 1973 as an improved version of the M109 self-propelled howitzer. The main improvement was the installation of a new 155 mm M185 cannon, which had a longer barrel and a higher muzzle velocity than the previous M126. This increased the effective range of the M109A1 from 14.6 km to 18 km, giving it an advantage over foreign artillery. It was known for its role in supporting the US Army's operations in Europe and the Middle East, where it could provide fire support for ground forces and counter-battery fire against enemy artillery. The existing M109A1's were later converted to the M109A2 standard, which incorporated 27 RAM (Reliability, Availability, Maintainability) improvements.

The M109A1 was introduced in Update "Kings of Battle". It has similar characteristics to the Soviet 2S3M and can deliver powerful 155 mm shells over long distances and relocate swiftly to evade enemy fire. The M109A1 has a terrible rate of fire and large ammo capacity, and its mobility is complemented by a good top speed and acceleration. However, its armour is not very thick, so it's recommended to use the M109A1's speed to avoid direct confrontations when possible. Moreover, it is essential to keep in mind that the M109A1 has low gun depression and cannot depend on firing from elevated positions.

General info

Survivability and armour

Armourfront / side / back
Hull32 / 32 / 32
Turret32 / 32 / 32
Crew6 people
Visibility96 %

The armour on the M109 is nearly non-existent, being surrounded by 32 mm thick aluminium alloy 5083, which effectively comes down to 13-20 mm RHA. This leaves the vehicle vulnerable to even light machine gun fire from any angle. The weakness of the armour turns into a strong-suit against AP shells that will pass straight through, unable to fuse or create enough spall to inflict major damage. Direct hits from HE and other chemical shells such as HEAT, will most likely leave the M109 a burning wreck. The 6 crew members are pretty spaced apart in the turret, giving a plus to crew survivability.

Armour type:

Armour Front (Slope angle) Sides Rear Roof
Hull 32 mm 32 mm Top
32 mm Bottom
32 mm 10 - 34 mm
Turret 37 mm Turret front
33 mm Gun mantlet
32 mm 32 mm 7 - 33 mm
Cupola 33 mm 33 mm 33 mm 33 mm

Notes:

Mobility

Speedforward / back
AB62 / 13 km/h
RB and SB57 / 12 km/h
Number of gears8 forward
4 back
Weight24.1 t
Engine power
AB773 hp
RB and SB405 hp
Power-to-weight ratio
AB32.1 hp/t
RB and SB16.8 hp/t

Write about the mobility of the ground vehicle. Estimate the specific power and manoeuvrability, as well as the maximum speed forwards and backwards.

Game Mode Max Speed (km/h) Weight (tons) Engine power (horsepower) Power-to-weight ratio (hp/ton)
Forward Reverse Stock Upgraded Stock Upgraded
Arcade 62 13 24.1 575 773 23.86 32.07
Realistic 57 12 358 405 14.85 16.8

Modifications and economy

Repair costBasic → Reference
AB2 557 → 3 163 Sl icon.png
RB2 909 → 3 598 Sl icon.png
SB4 019 → 4 971 Sl icon.png
Total cost of modifications40 400 Rp icon.png
78 900 Sl icon.png
Talisman cost1 400 Ge icon.png
Crew training45 000 Sl icon.png
Experts155 000 Sl icon.png
Aces630 Ge icon.png
Research Aces440 000 Rp icon.png
Reward for battleAB / RB / SB
100 / 160 / 210 % Sl icon.png
160 / 160 / 160 % Rp icon.png
Modifications
Mobility Protection Firepower
Mods new tank traks.png
Tracks
Research:
2 000 Rp icon.png
Cost:
3 900 Sl icon.png
115 Ge icon.png
Mods new tank suspension.png
Suspension
Research:
1 800 Rp icon.png
Cost:
3 500 Sl icon.png
105 Ge icon.png
Mods new tank break.png
Brake System
Research:
1 800 Rp icon.png
Cost:
3 500 Sl icon.png
105 Ge icon.png
Mods new tank filter.png
Filters
Research:
3 400 Rp icon.png
Cost:
6 600 Sl icon.png
195 Ge icon.png
Mods new tank transmission.png
Transmission
Research:
6 600 Rp icon.png
Cost:
13 000 Sl icon.png
380 Ge icon.png
Mods new tank engine.png
Engine
Research:
6 600 Rp icon.png
Cost:
13 000 Sl icon.png
380 Ge icon.png
Mods tank tool kit.png
Improved Parts
Research:
2 000 Rp icon.png
Cost:
3 900 Sl icon.png
115 Ge icon.png
Mods extinguisher.png
Improved FPE
Research:
1 800 Rp icon.png
Cost:
3 500 Sl icon.png
105 Ge icon.png
Mods tank reinforcement us.png
Crew Replenishment
Research:
3 400 Rp icon.png
Cost:
6 600 Sl icon.png
195 Ge icon.png
Mods new tank horizontal aiming.png
Horizontal Drive
Research:
2 000 Rp icon.png
Cost:
3 900 Sl icon.png
115 Ge icon.png
Mods tank ammo.png
155mm_M110_Smoke_ammo_pack
Research:
2 000 Rp icon.png
Cost:
3 900 Sl icon.png
115 Ge icon.png
Mods tank cannon.png
Adjustment of Fire
Research:
1 800 Rp icon.png
Cost:
3 500 Sl icon.png
105 Ge icon.png
Mods tank ammo.png
155mm_M107_HE_PF_ammo_pack
Research:
1 800 Rp icon.png
Cost:
3 500 Sl icon.png
105 Ge icon.png
Mods new tank vertical aiming.png
Elevation Mechanism
Research:
3 400 Rp icon.png
Cost:
6 600 Sl icon.png
195 Ge icon.png

Armaments

Main armament

155 mm M185 cannon
Ammunition28 rounds
First-order16 rounds
Reloadbasic crew → aces
17.3 → 13.3 s
Vertical guidance-3° / 75°
Main article: M185 (155 mm)

The M109A1's high projectile speed compared to other M109 variants makes it a bit easier to aim, but generally still low. Its high explosive round is very effective against German tanks, not so much against Soviet ones. Remember to pre-turn your turret, as your rotation speed is abysmal.

155 mm M185 Turret rotation speed (°/s) Reloading rate (seconds)
Mode Capacity Vertical Horizontal Stabilizer Stock Upgraded Full Expert Aced Stock Full Expert Aced
Arcade 28 -3°/+75° ±180° - 9.7 13.4 16.3 18.0 19.1 17.29 15.30 14.10 13.30
Realistic 6.5 7.7 9.4 10.3 11.0

Ammunition

Penetration statistics
Ammunition Type of
warhead
Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
M107 HE 61 61 61 61 61 61
M107 (PF) HE-VT 61 61 61 61 61 61
Shell details
Ammunition Type of
warhead
Velocity
(m/s)
Projectile
mass (kg)
Fuse delay
(m)
Fuse sensitivity
(mm)
Explosive mass
(TNT equivalent) (kg)
Ricochet
0% 50% 100%
M107 HE 684 43.1 0.3 0.1 9.14 79° 80° 81°
Proximity-fused shell details
Ammunition Type of
warhead
Velocity
(m/s)
Projectile
mass (kg)
Fuse delay
(m)
Fuse sensitivity
(mm)
Arming
distance (m)
Trigger
radius (m)
Explosive mass
(TNT equivalent) (kg)
Ricochet
0% 50% 100%
M107 (PF) HE-VT 684 43.1 0 0 300 3 9.14 79° 80° 81°
Smoke shell characteristics
Ammunition Velocity
(m/s)
Projectile
mass (kg)
Screen radius
(m)
Screen deploy
time (s)
Screen hold
time (s)
Explosive mass
(TNT equivalent) (g)
M110 684 44.63 21 5 30 50

Ammo racks

Full
ammo
1st
rack empty
2nd
rack empty
3rd
rack empty
4th
rack empty
5th
rack empty
6th
rack empty
Visual
discrepancy
28 __ (+__) __ (+__) __ (+__) __ (+__) __ (+__) __ (+__) __

Machine guns

Ammunition600 rounds
Belt capacity200 rounds
Reloadbasic crew → aces
10.4 → 8.0 s
Fire rate575 shots/min
Vertical guidance-10° / 45°
Main article: M2HB (12.7 mm)

The 12.7 mm M2HB is able to penetrate lightly-armoured vehicles, take down low-flying aircraft or mow down obstacles. The machine gun has a limited amount of ammo, so use it sparingly.

12.7 mm M2HB
Mount Capacity (Belt) Fire rate Vertical Horizontal
Pintle 600 (200) 575 -10°/+50° ±180°

Usage in battles

The 155 mm cannon is surprisingly adept at destroying any tank, even up to heavies of the same or slightly higher BRs. It is important to remember that accuracy is low with this gun, but destructive capability is astronomical. Thus, it is best to put yourself in a well defended position and rely on ambush tactics, at least in Realistic mode. The M107(PF) makes a exceptionally good anti-air round against heavy bombers and helicopters due to its big calibre, but good aim is needed due to the long reload time. The M109 makes an exceptionally good target for planes with its large profile and thin armour, so plane strafing is something you'll have to be careful of.

Pros and cons

Pros:

  • Access to HE and HE-VT shells with more than 9 kg of TNT
  • Top speed of 56 km/h that it can easily reach
  • Can be surprisingly survivable, usually not taken out in a single shot
  • Impressive 75° elevation limit
  • Top mounted .50 cal for taking out softer targets

Cons:

  • Hindered by a limited gun depression of -3 degrees
  • The gunner optics have a low zoom level (4X)
  • Thin armour, will only stop small arms fire
  • Long reload (17.1 seconds stock)

History

Devblog

Development of the M109 began in the early 1950s under a U.S. program to develop a common chassis for a number of different SPH designs. Upon entering service, the M109 was immediately deployed to the Vietnam War. However, its operational service during the conflict was cut short due to serious mechanical malfunctions which rendered the fleet inoperable. Nonetheless, after being addressed and receiving its first upgrade to the A1 standard, the M109 would continue service with U.S. forces for decades to come, taking part in virtually all military conflicts where U.S. forces were deployed in. Once its design eventually matured, the M109 successfully resisted replacement on multiple occasions and continuously received upgrades until the present day.

Media

Skins
Videos

See also

Related development

External links


USA tank destroyers
M10  M10 GMC
M36  M36 GMC · M36B2
T95  T28 · T95
M109  M109A1
ATGM  LOSAT · M901 · ADATS
Wheeled  M3 GMC · T55E1
Other  M8 HMC · M50 · M56
China  ▃LVT(A)(4) (ZIS-2)