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Birch Gun

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Birch Gun

Birch_Gun_render_1.jpg
Battle Tier
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Overview
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Well, the ones further down, of course.
" for more information
[Client Values; Actual values in
Specifically, the mismatch in crew values caused by commander's 10% crew skill bonus. Outside of a crew of 1 commander only, 100% crew is a fiction. The client values, given for 100% crew, will normally be taken into battle with 110% crew skill members aside from specific functions, causing their actual performance to deviate from the expected client value. These differences are taken into account in tooltip boxes.
]
152,000  Credits Cost
190190 HP Hit Points
12.1/12.212.15/14.2 t Weight Limit
Crew
  1. Commander (Radio Operator)
  2. Gunner
  3. Gunner
  4. Driver
  5. Loader
  6. Loader
Mobility
90110 hp Engine Power
45/10 km/h Speed Limit
1618 deg/s Traverse
7.449.05 hp/t Power/Wt Ratio
YesYes Pivot
Armor
6/6/6 mm Hull Armor
Armament







{{#ifeq:|ARMOR_PIERCING||



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HE







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{{#ifeq:|ARMOR_PIERCING||


HE
Shells




















72/0




















83/0
Shell Cost
260//280// HP Damage
21//22// mm Penetration



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6.82 r/m 

Standard Gun

Reload Times
Nominal: 8.8 s
50% Crew: 10.9 s
75% Crew: 9.52 s
100% Crew: 8.44 s
Rammer: 7.6 s
Vents: 8.25 s
Both: 7.43 s
Both and BiA: 7.27 s
Both and Max Crew %: 6.97 s

See Crew, Consumables, or Equipment for more information.



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6.25 r/m 

Standard Gun

Reload Times
Nominal: 9.6 s
50% Crew: 11.89 s
75% Crew: 10.38 s
100% Crew: 9.2 s
Rammer: 8.28 s
Vents: 9 s
Both: 8.1 s
Both and BiA: 7.92 s
Both and Max Crew %: 7.59 s

See Crew, Consumables, or Equipment for more information.
Rate of Fire






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982.8

Standard Gun

Using Shell Type 1 (260 Damage):
With wholly penetrating hits

Theoretical Damage Per Minute
Nominal DPM: 982.8
50% Crew: 793
75% Crew: 907.4
100% Crew: 1024.4
100% Crew
Vents: 1047.8
Rammer: 1138.8
Both: 1164.8
Both and BiA: 1190.8
Both and Max Crew %: 1240.2

Advantageous Damage Per Minute
First-shot DPM: 1242.8
50% Crew: 1053
75% Crew: 1167.4
100% Crew: 1284.4
100% Crew
Rammer: 1398.8
Vents: 1307.8
Both: 1424.8
Both and BiA: 1450.8
Both and Max Crew %: 1500.2

See here, here, or here for more information.






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1750

Standard Gun

Using Shell Type 1 (280 Damage):
With wholly penetrating hits

Theoretical Damage Per Minute
Nominal DPM: 1750
50% Crew: 1414
75% Crew: 1618.4
100% Crew: 1825.6
100% Crew
Vents: 1867.6
Rammer: 2027.2
Both: 2074.8
Both and BiA: 2119.6
Both and Max Crew %: 2212

Advantageous Damage Per Minute
First-shot DPM: 2030
50% Crew: 1694
75% Crew: 1898.4
100% Crew: 2105.6
100% Crew
Rammer: 2307.2
Vents: 2147.6
Both: 2354.8
Both and BiA: 2399.6
Both and Max Crew %: 2492

See here, here, or here for more information.
Damage Per Minute


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0.74 m 

With 50% Crew: 0.917 m
With 75% Crew: 0.8 m
With 100% Crew: 0.71 m
With BiA: 0.694 m
With BiA and Vents: 0.679 m
Maximum possible: 0.651 m

For more details, see Crew


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0.72 m 

With 50% Crew: 0.892 m
With 75% Crew: 0.779 m
With 100% Crew: 0.69 m
With BiA: 0.675 m
With BiA and Vents: 0.66 m
Maximum possible: 0.633 m

For more details, see Crew
Accuracy


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5 s 

With 50% Crew: 6.194 s
With 75% Crew: 5.408 s
With 100% Crew: 4.794 s
With GLD: 4.358 s
With BiA: 4.689 s
With BiA and Vents: 4.587 s
With both and GLD: 4.17 s
Maximum possible: 3.997 s

For more details, see Crew or Equipment


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5 s 

With 50% Crew: 6.194 s
With 75% Crew: 5.408 s
With 100% Crew: 4.794 s
With GLD: 4.358 s
With BiA: 4.689 s
With BiA and Vents: 4.587 s
With both and GLD: 4.17 s
Maximum possible: 3.997 s

For more details, see Crew or Equipment
Aim time
1616 deg/s Gun Traverse Speed
360° Gun Arc
-5°/+38°-5°/+70° Elevation Arc
150150 rounds Ammo Capacity
General
2020 % Chance of Fire






265 m 

With 50% Crew: 208.2 m
With 75% Crew: 236.6 m
With 100% Crew: 265 m
With Recon and Situational Awareness: 278.4 m
With Coated Optics: 291.5 m
With Binocular Telescope: 331.25 m
Maximum possible: 379.4 m

For more details, see Skills or Equipment






265 m 

With 50% Crew: 208.2 m
With 75% Crew: 236.6 m
With 100% Crew: 265 m
With Recon and Situational Awareness: 278.4 m
With Coated Optics: 291.5 m
With Binocular Telescope: 331.25 m
Maximum possible: 379.4 m

For more details, see Skills or Equipment
View Range


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400 m 

With 50% Crew: 314.3 m
With 75% Crew: 357.2 m
With 100% Crew: 400 m
With 100% Signal Boost: 480 m
When affected by 100% Relaying: 440 m
Maximum possible: 575.6 m

For more details, see Skills or Equipment


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550 m 

With 50% Crew: 432.1 m
With 75% Crew: 491.1 m
With 100% Crew: 550 m
With 100% Signal Boost: 660 m
When affected by 100% Relaying: 605 m
Maximum possible: 791.4 m

For more details, see Skills or Equipment
Signal Range
Values are Stock - click for Top


IV

annoGB26_Birch_Gun.png

152000

The Birch Gun is a British tier 4 self-propelled gun.

In the 1920s, British engineers explored the idea of an SPG on a tank chassis. Development of the vehicle started in 1923 at the Royal Arsenal, Woolwich. It was based on the Vickers Medium Mark II, the chassis of which could carry the required modules. A total of seven prototypes were manufactured and joined the Experimental Mechanised Force established on May 1, 1927. Later, the unit was disbanded, along with the SPG program.

For all intents and purposes, the Birch Gun functions identically to the SU-26. Equipping a Camo Net would be very useful, since it will not have to turn its chassis when acquiring new targets (unless you want to snap to a target quickly, as the gun traverse is slow). Having a low profile not only helps in camouflaging, it also comes in handy when going into TD mode to fight off tanks that come too close.

While the 25-pounder gun is marginally more powerful than the stock 18-pounder, it can load AP rounds, which comes in useful for staying hidden. Its anemic damage and low splash means that, for the most part, you will be doing double digit damage to anything with a reasonable amount of armour. However, it makes up for it with a good rate of fire like its predecessor the Sexton II, along with decent accuracy and a high gun arc to fire over obstacles.

The Birch Gun leads to the Bishop.

Modules / Available Equipment and Consumables

Modules

Ico_gun_alpha.png

Guns

Tier Gun Penetration
(mm)
Damage
(HP)
Rate of fire
(rounds/minute)
Dispersion
(m/100m)
Aiming time
(s)
Weight
(kg)
Price
(Credits)

IV Q.F. 25-Pr. Gun/How. 22 280 6.25 0.72 5 510 28500
III Q.F. 18-Pr. 21 260 6.82 0.74 5 457 10500

Ico_engine_alpha.png

Engines

Tier Engine Engine Power
(hp)
Chance of Fire on Impact
(%)
Weight
(kg)
Price
(Credits)

I Armstrong Siddeley V8 90 20 200 0
I Armstrong Siddeley V8 SC 110 20 200 350

Ico_suspension_alpha.png

Suspensions

Tier Suspension Load Limit
(т)
Traverse Speed
(гр/сек)
Rmin Weight
(kg)
Price
(Credits)

III Birch Gun Mk. I 12.2 16 0 6000 2000
IV Birch Gun Mk. II 14.2 18 0 6000 4650

Ico_radio_alpha.png

Radios

Tier Radio Signal Range
(м)
Weight
(kg)
Price
(Credits)

VII WS No. 19 Mk. II 450 40 21000
VI WS No. 19 Mk. I 400 40 15000
VIII WS No. 19 Mk. III 550 40 22000


Compatible Equipment

Medium Spall Liner Camouflage Net Coated Optics Enhanced Gun Laying Drive Enhanced Vertical Leaf Springs Medium-Caliber Artillery Shell Rammer Binocular Telescope Toolbox "Wet" Ammo Rack Class 1 

Compatible Consumables

Automatic Fire Extinguisher 100-octane Gasoline 105-octane Gasoline Manual Fire Extinguisher Large First Aid Kit Large Repair Kit Pudding and Tea Small First Aid Kit Small Repair Kit 


Player Opinion

Pros and Cons

Pros:


  • Gun range: stock: 850 m, top: 1050 m
  • Can rotate its gun 360 degrees, like the SU-26
  • High gun arc, comparable to Soviet artillery
  • Massive ammo capacity
  • Good reload speed


Cons:


  • Poor accuracy
  • Low alpha damage
  • Poor splash radius
  • Open top, which means it's vulnerable to crew and module damage
  • Weak engine


Performance

Compared to the large caliber guns of most other SPGs, the Birch Gun takes on a more autocannonesque approach to indirect fire support by utilizing a fast-firing gun with mediocre damage and anemic penetration. Apart from lucky shots hitting vulnerable parts on poorly armored targets, the one-shot-one-kill-scenario remains a dream at best; what you get is an endless stream of double-digit hits. Concentrating on lighter targets and the side armour of heavier ones yields the best damage. However, while some might look down on the Birch Gun because of this, the damage tends to stack up, even against heavier opponents.

While most SPGs require careful aiming to ensure damage, the fast rate of fire, surprisingly accurate gun, low ammo cost and practically endless ammo supply means that the Birch Gun employs a more leisurely mindset. Snap shots become a somewhat practical option: Acquire a new target, shoot without aiming as soon as the gun has turned and wait for the aiming circle to close while a new shell is loaded. The unaimed shell hits surprisingly often, while the second, aimed shot can be delivered with precision. The drawbacks to this sort of approach are potentially giving your position away to counter-arty and alerting an unsuspecting target about being under fire if the first shot doesn't hit. Even shots against fast-moving targets are viable, because a miss is not an issue and a lucky hit can result in some damage or in best cases a dead or detracked enemy.

Even though the gun depression and fully rotating turret mean that the Birch Gun is much more adept at direct-fire self-defence than most SPGs, the poor penetration means that hitting a light tank doesn't ensure its demise, so relying on 'TD mode' for survivability will often result in a slightly damaged scout and a burning wreck of a Birch Gun. Using the AP shells for self-defence yields an improved chance of destroying the attacking light tank provided that the shells hit and penetrate.

Due to the poor engine power and traverse speed, repositioning is a somewhat arduous process and fleeing impractical, so picking a safe spot and sitting in it for the rest of the battle while raining shells in every direction is the most practical approach mobility-wise.

The Birch Gun has earned an unimaginative but fitting nickname both from owners that dislike the slightly unconventional characteristics and from enemies annoyed by a constant hail of low-damage HE shells picking away at their health.


Early Research

  • If you haven't already on the Sexton II, get the 25-pounder gun, you'll need it to progress to the next tier anyway, and the suspension can take it.
  • Upgrading the radio is useful. The suspension needs to be upgraded before fitting more modules/equipment. Engine is purely optional; there is barely any visible difference in performance.
  • Go from there.


Suggested Equipment


Medium-Caliber Artillery Shell Rammer Enhanced Gun Laying Drive 


Gallery

Historical Info

Photo of the British medium tank Mk.II with 18pdr AA gunm 1925

The Birch Gun was the world's first practical self-propelled artillery gun, built at the Royal Arsenal, Woolwich in 1925. The gun was never highly regarded by the British High Command, purely for prejudicial beliefs and political pressure rather than any real lack of ability.[1] Named after General Sir Noel Birch, who was Master General of Ordnance at the time, the Birch gun had real potential. It was built upon a Vickers Medium Mark II tank chassis and mated originally with the QF 18 pdr (83.8 mm) gun then with a 75 mm field gun. The project was abandoned in 1928 after political pressure killed off any plans to complete the third version of this weapon.

Development history

The initial prototype, the Mark I, made its first appearance in January 1925 and spent the next year undergoing trials and taking part in manoeuvres, mainly with 28 Battery, 9th Field Brigade, Royal Artillery. The lone Mark I was transferred to 20 Battery, 9th Field Brigade RA, who then took delivery of three Mark II Birch Guns in July 1926, followed by a fourth gun in September. This brought the battery strength to five guns, which participated in various field exercises as part of the Experimental Mechanised Force and it successor, the Experimental Armoured Force which was dispersed in February 1929. All five guns were finally withdrawn in June/July 1931, effectively ending the British Army's experiments with tracked self-propelled guns until the advent of various hurriedly improvised vehicles during the Second World War, such as the Bishop, and the Deacon. Two Mark III Birch Guns were produced, but never issued to serving units. These had the guns mounted in revolving barbette-style turrets that increased crew protection but reduced the guns' elevation, so capping their effective range. The armament for the original Birch Gun consisted of an Ordnance QF 18 pounder field gun (3.3 inch, 84 mm). This was changed to the 75 mm gun on the Birch gun Mk II and from then on was able to be fired either at ground targets or in the air-defence role, being given a much higher rate of elevation to be fired at enemy aircraft. The Armstrong Siddeley engine was modestly powerful. Being only 8 cylinders it could manage 90 hp for a mild 45 km/h top-speed. However, for its time (late 1920s) it was quite fast.

The Birch gun was tested as part of the Experimental Mechanised Force in the 1920s. The Force undertook various experiments in mechanized warfare combining tanks and infantry with their own transport. The project was finally abandoned in 1928 after major political pressure cancelled all plans to complete the third version of this weapon.


Historical Gallery

Historical Accuracy Errata

The following are consensus errors or inconsistencies which have been identified with the configuration of the vehicle in question and conflict with information available on the public record. The causes for these divergences in the game are normally not disclosed and may be rooted in game balance.

Development of the 25-pdr gun began in 1935, seven years after the Birch Gun project was abandoned.
  • One of its historical armaments, a 75 mm field gun, is missing.
  • The Birch Gun actually predates its tier 3 predecessor, the Sexton II, by 20 years.


UK
Light Tanks IICruiser Mk. I IIM2 IICruiser Mk. III IILight Mk. VIC IIIStuart I-IV IIICruiser Mk. IV IIICruiser Mk. II IVValentine IVCovenanter
Medium Tanks IVickers Medium Mk. I IIVickers Medium Mk. II IIIVickers Medium Mk. III IVMatilda IVGrant IVAC 1 Sentinel VCrusader VSherman III VMatilda Black Prince VISherman Firefly VICromwell VIAC 4 Experimental VICromwell B VIIComet VIIICenturion Mk. I VIIIFV4202 VIIIChieftain/T95 IXCenturion Mk. 7/1 XCenturion Action X
Heavy Tanks VChurchill I VExcelsior VIChurchill VII VITOG II* VIIBlack Prince VIIFV201 (A45) VIIICaernarvon IXConqueror XFV215b
Tank Destroyers IIUniversal Carrier 2-pdr IIIValentine AT IVAlecto VArcher VAT 2 VIChurchill Gun Carrier VIAchilles VIAT 8 VIIChallenger VIIAT 15A VIIAT 7 VIIIAT 15 VIIICharioteer IXTortoise IXFV4004 Conway XFV215b (183) XFV4005 Stage II
Self-Propelled Artillery IILoyd Gun Carriage IIISexton II IIISexton I IVBirch Gun VBishop VIFV304 VIICrusader 5.5-in. SP VIIIFV207 IXFV3805 XConqueror Gun Carriage
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USA IIT1 HMC IIIT18 HMC IIIM7 Priest IVT82 HMC IVM37 VM41 HMC VIM44 VIIM12 VIIIM40/M43 IXM53/M55 XT92 HMC
UK IILoyd Gun Carriage IIISexton II IIISexton I IVBirch Gun VBishop VIFV304 VIICrusader 5.5-in. SP VIIIFV207 IXFV3805 XConqueror Gun Carriage
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France IIRenault FT 75 BS IIILorraine 39L AM IVAMX 105 AM mle. 47 VAMX 13 105 AM mle. 50 V105 leFH18B2 VIAMX 13 F3 AM VIILorraine 155 mle. 50 VIIILorraine 155 mle. 51 IXBat.-Châtillon 155 55 XBat.-Châtillon 155 58
USSR IISU-18 IIISU-26 IVSU-5 VSU-122A VISU-8 VIIS-51 VIISU-14-1 VIIISU-14-2 IX212A XObject 261
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