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BT-7

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BT-7 (Stock)

AnnoBT-7.png
Totals
37000 Price
210 Hit Points
14.01 / 14.2 kgWeight
Crew
  1. Commander
Armor
20/15/13Hull Armor(front/sides/rear, mm)
20/15/15Turret Armor(front/sides/rear, mm)
Maneuver
450 h.p.Engine Power
66 km/hSpeed Limit
50 deg/secTraverse Speed
Firepower
47 Standard Shell Damage
51 mmStandard Shell Penetration
2.3 Time for Complete Loading
44 deg/secTurret Traverse Speed
Communication
280 mView Range
300 mSignal Range
III
BT-7
37000
The BT-7 was a further modernization of the BT series, with a total of 5,556 vehicles of different variants produced from 1935 through 1940.

The BT-7 is a direct upgrade of the BT-2, offering even more speed and acceleration, more HP, and much better turning properties. It is one of the fastest tanks in the game, in exchange for very poor armor and relatively weak armament.

BT-7

Stock

Level Turret Weight (t) Turret Armor (front/sides/rear, mm) Turret Traverse Speed (deg/s) View Range (m)
turret II BT-7 mod. 1935 950 20/15/15 44 280
Level Gun Weight (t) Average Penetration (mm) Rate of Fire Dispersion at 100 m Aiming Time
gun II 45 mm 20K 250 51/88/23 47/47/62 26.09 0.46 2.3
Level Engine Weight (t) Engine Power (h.p.) Chance of Fire on Impact
engine IV M-17L 610 450 20
Level Suspension Weight (t) Load Limit Traverse Speed (deg/s)
chassis II BT-5 4000 14.2 50
Level Radio Weight (t) Signal Range (m)
radio III 71-TK-3 0 300

BT-7 Mod 1937

Health

Level Turret Weight (t) Turret Armor (front/sides/rear, mm) Turret Traverse Speed (deg/s) View Range (m)
turret III BT-7 mod. 1937 1050 20/15/15 46 300
Level Gun Weight (t) Average Penetration (mm) Rate of Fire Dispersion at 100 m Aiming Time
gun II 45 mm 20K 250 51/88/23 47/47/62 28.57 0.46 1.7
Level Engine Weight (t) Engine Power (h.p.) Chance of Fire on Impact
engine IV M-17L 610 450 20
Level Suspension Weight (t) Load Limit Traverse Speed (deg/s)
chassis III BT-7 4000 15.5 54
Level Radio Weight (t) Signal Range (m)
radio IX 12LL 0 615

BT-7V

Attack

Level Turret Weight (t) Turret Armor (front/sides/rear, mm) Turret Traverse Speed (deg/s) View Range (m)
turret III BT-7 mod. 1937 1050 20/15/15 46 300
Level Gun Weight (t) Average Penetration (mm) Rate of Fire Dispersion at 100 m Aiming Time
gun II 23 mm VJa 71 30/42/23 12/12/62 116.13 0.54 1.5
Level Engine Weight (t) Engine Power (h.p.) Chance of Fire on Impact
engine IV M-17T 610 500 20
Level Suspension Weight (t) Load Limit Traverse Speed (deg/s)
chassis III BT-7 4000 15.5 54
Level Radio Weight (t) Signal Range (m)
radio IX 12LL 0 615

BT-7M

Attack

Level Turret Weight (t) Turret Armor (front/sides/rear, mm) Turret Traverse Speed (deg/s) View Range (m)
turret III BT-7 mod. 1937 1050 20/15/15 46 300
Level Gun Weight (t) Average Penetration (mm) Rate of Fire Dispersion at 100 m Aiming Time
gun III 37 mm ZiS-19 200 58/92/19 40/40/50 28.57 0.39 1.7
Level Engine Weight (t) Engine Power (h.p.) Chance of Fire on Impact
engine V V-2 750 480 15
Level Suspension Weight (t) Load Limit Traverse Speed (deg/s)
chassis III BT-7 4000 15.5 54
Level Radio Weight (t) Signal Range (m)
radio IX 12LL 0 615

BT-8A

Health

Level Turret Weight (t) Turret Armor (front/sides/rear, mm) Turret Traverse Speed (deg/s) View Range (m)
turret III BT-7 mod. 1937 1050 20/15/15 46 300
Level Gun Weight (t) Average Penetration (mm) Rate of Fire Dispersion at 100 m Aiming Time
gun II 23 mm VJa 71 30/42/23 12/12/62 116.13 0.54 1.5
Level Engine Weight (t) Engine Power (h.p.) Chance of Fire on Impact
engine V V-2 750 480 15
Level Suspension Weight (t) Load Limit Traverse Speed (deg/s)
chassis III BT-7 4000 15.5 54
Level Radio Weight (t) Signal Range (m)
radio IX 12LL 0 615

Compatible Equipment

Small Spall Liner
Camouflage Net
Coated Optics
Enhanced Gun Laying Drive
Enhanced Christie Suspension
Cyclone Filter
Improved Ventilation Class 1
Binocular Telescope
Toolbox

Compatible Consumables

Automatic Fire Extinguisher
Manual Fire Extinguisher
Large First Aid Kit
Large Repair Kit
Lend-Lease Oil
Extra Combat Rations
Removed Speed Governor
Small First Aid Kit
Small Repair Kit

Player Opinion

Pros and Cons

Pros:


  • Excellent speed and acceleration.
  • Good maneuverability.
  • Low profile and good camouflage values.
  • ZiS-9 gun has good accuracy when on the move
  • Surprisingly good for ramming


Cons:


  • Paper-thin armor and below average HP.
  • Disappointing damage and penetration on all weapons.


Performance

The BT-7 is basically a slightly faster BT-2 with slightly more HP that now faces up to tanks up to Tier 5. It has a choice of three weapons, all of which are carried over from the BT-2. The 23 mm VYa has decent damage output and is particularly good for running-and-gunning while on the move, but is useless against most Tier 4 and Tier 5 tanks. The 45 mm 20K has mediocre accuracy, fairly good penetration, and good damage. The 37 mm ZiS-19 offers the best penetration of all the weapons, and has excellent accuracy but somewhat disappointing damage output.

The BT-7 excels as a raider/breakthrough exploitation tank, the role for which it was originally designed. Once it has broken through the enemy's front line, it can hunt down enemy artillery and, in skilled hands, cause a great amount of disruption. The BT-7 works particularly well in combination with other BT tanks and the T-50.

While adequate enough to allow the BT-7 to act as a battle tank in Tier 3 or 4 matches, all the weapons have insufficient penetration to deal with heavier tanks that the BT-7 sometimes faces in Tier 5. In such matches, the BT-7 is best used as a support sniper or flanker, not drawing any unnecessary attention to itself. While the BT-7 is quite capable of pulling off the circling technique against heavier tanks, this should only be used as a last resort.

The BT-7's great speed and good camouflage also allows it to be used in the scouting role. Its superb speed will allow it to take up forward spotting positions quickly after the start of the game. However, the BT-7's view range is ok, though this can be remedied to an extent with the use of Binoculars, Coated Optics, and the Recon or Situational Awareness skills. The BT-7 can also be used as a counter-scout, as it has the speed and sufficient agility and firepower to intercept most enemy light tanks without too much trouble.

In addition, the high speed combined with rather decent mass allow ramming to be a somewhat viable option for this tank. But unless your driver has the Controlled Impact skill, this should only be done if your tank has low health, and against serious threats which have a small enough mass to take serious damage from a collision.

Crew Skills

  • Camouflage as the first skill on all the crew members is a good choice and is invaluable if the BT-7 is required to take up the scouting role. Repairs is not very useful, as getting tracked or having the engine damaged on the BT-7 without a repair kit is almost always fatal.
  • A more specialized set of first skills would be Situational Awareness (Commander/Radio Operator), Snap Shot (Gunner/Loader), Smooth Ride (Driver). Situational Awareness provides a bigger view range bonus than Recon, and is generally superior. Snap Shot and Smooth Ride combined act like a Vertical Stabilizer (which the BT-7 does not have access to), reducing the accuracy penalties incurred while moving and rotating the turret. Due to its speed, the BT-7 has higher accuracy penalties while moving than most tanks, and this can be important in helping the BT-7 get its shot off first. Off-Road Driving is also a viable option for the driver to further augment the BT-7's excellent mobility.
  • Upon reaching 100% on the first skills, dropping the commander's skill for Sixth Sense is an excellent option. Deadeye is a good perk for the gunner, especially when targeting weakspots like engines and ammunition racks. The gunner also acts as the loader, but the loader only has access to perks which are not particularly useful for the BT-7: Safe Stowage increases the HP of the ammunition rack, but the BT-7's best defence is to not take a hit at all, while the BT-7 will very rarely find itself at under 10% of its HP so that the Adrenaline Rush perk activates.
  • Brothers-in-Arms is a good perk to have on any tank, but requires all crew members to have it at 100% before it works. The bonus to crew skills is particularly noticeable when combined with Improved Ventilation.


Early Research

  • All the BT-7's guns carry over from the BT-2, but the 37 mm ZiS-19 needs the conical turret. Both the 23 mm VYa and 45 mm 20K are viable on the BT-7, depending on the preferred playstyle.
  • The 12LL radio can be researched on the SU-26, and should be mounted if available.
  • The first priority should be the M-17F engine, which dramatically increases the BT-7's performance.
  • The BT-7 suspension should be researched next for increased hull traverse speed and load limit
  • The BT-7 conical turret should be researched next, finally allowing the ZiS-19 to be mounted.
  • Finally, the V-2 engine is required to unlock the A-20, but it is inadvisable to equip it; it provides 20 hp less than the M-17F and also weighs 140 kg more, significantly reducing performance. The only benefit it has over the M-17F is a 5% less chance of catching fire when hit.


Historical Info

Early variant of the BT-7 tank

The BT-7 was the last of the BT tank series of Soviet cavalry tanks that were produced in large numbers between 1935 and 1940. They were lightly armored, but reasonably well-armed for their time, and had much better mobility than other contemporary tank designs. The BT tanks were known by the nickname Betka from the acronym, or its diminutive Betushka. BT (Russian: БТ) stands for fast tank (Быстроходный танк, Bystrokhodny tank). The successor of the BT-7 Tank would be the famous T-34 medium tank, introduced in 1940, which would replace all of the Soviet fast tanks, infantry tanks, and medium tanks then in service.

Development history

The first prototypes of the BT-7 had a distinctive canted-ellipse shaped turret mounting both the main gun and a coaxial machine-gun. The specification also called for the project to allow for installation without any significant change to the framework of new guns: the 76 mm CT or PS-3 main gun (a short-barreled howitzer) and the 45 mm 20K model 1932/38, a long-barreled, high-velocity gun useful against tanks, but less effective than the 76 mm gun against infantry.

In the rear of the turret, there was housed a rotating drum-type magazine for 18 76 mm shells or a radio station. The prototype underwent an extensive testing program in the summer and autumn of 1934. As a result of this testing, it was felt that a machine-gun was unnecessary on a tank with a 3-man crew, especially as it made the assembly of the turret more complicated.
BT-7-2 Training turret at Stalin Military Academy

Therefore, in early 1935, the tank went into production with a simpler design, incorporating the turret from the BT-5. (However, the idea of wheeled/tracked vehicle with a 76 mm cannon was not abandoned and the plant was commissioned to develop a new BT-7 turret from the turret of the T-26-4). In the production model, a cylindrical turret housed a 45 mm 20K gun with a DT-model machine-gun. On some of the tanks, a model 71-TC radio with frame antenna was installed. The crew consisted of three men: the commander (who also served as the gunner), the loader, and the driver. In 1937, the company launched production of the BT-7 with a conical turret. Main armament remained the same, but the ammunition was increased to 44 rounds. All serving tanks now installed the DT machine gun in the rear niche. For the firing of the gun and coaxial machine gun at night, the tank was equipped with two special projector-type headlamps, and a mask placed on the gun. Subsequently, these Lights were retrofitted to earlier models of the tank. Improvements were also made to the drive wheels, caterpillar tracks, and gearbox by 1938. In parallel with the main modification, 154 BT-7A artillery tanks were produced between 1936 and 1938, fitted with a larger turret and a 76 mm CT-type gun, with 50 rounds of ammunition (40 in a tank with a portable radio). In 1938, four experimental BT-8 tanks mounted with V-2 diesel engines were produced. After comparative tests of the BT-7 and BT-8, the diesel tanks were put into production in 1940 (under the designation BT-7M) with the powerplants being produced in a separate plant of the Voroshilovets factory to ensure supply. From December 1939, the BT-7A went into production with some minor modifications; additional bracing for rigidity, a manhole underneath, and a smaller air filter. The diesel-powered tanks showed much-reduced fuel costs, and the petrol tanks were soon placed into reserve.

BT-7 M on wheels; 1940.jpg

Several experimental tanks were conceived based on the BT series, for example: the wheeled BT-IC, designed by NF Tsyganova, a platoon commander in the 4th Armoured Regiment of the Ukraine Military District and self-taught designer. The type successfully passed field tests, but was not ordered in bulk. Another Tsyganova design was the S-2 "Turtle", with a new design of hull and turret. There was also the command tank CBT-7 with a fixed turret, the OT-7 mounting aflamethrower, the HBT-7 designed to protect from toxic contamination and lay smokescreens, the PBT bridgelayer, and the TTBT-7 and Thubten-7 radio-controlled tanks (known at the time as Teletanki). Shortly before Operation Barbarossa, the BT-7 underwent an up-armor program. In 1940, Mariupol Ilyich Iron and Steel Works produced 50 sets of hinged homogeneous armor for the BT-7M, which increased the weight of the test tank to 18 tons. On the installation of these kits to military units, unfortunately, nothing is known.

Combat history

BT-7 and T-26 with_additional armor are moving to the frontline. 5th Tank Brigade Western Front, Nov.1941.

Between 1935 and 1940, between 2700 to 5328 BT-7 tanks of all modifications (except BT-7A) were built. They were operated by the armored and mechanized forces of the Red Army for almost the entire war. Over 2000 BT-7 series tanks were lost in the first 12 months on the Eastern Front. Hundreds had been immobilized even before the invasion by poor maintenance, and had to be abandoned as all Soviet forces withdrew eastward. The survivors fought against the Wehrmacht in numbers gradually reduced by attrition, until superseded by more modern types in 1944. The BT-7 series continued in use elsewhere, including being used against Japanese forces (Battle of Khalkhyn Gol and Manchurian Strategic Offensive Operation) in Manchuria in 1945.


Comparison of the BT-2, BT-5, BT-7, BT-7A, and BT-8
BT-2 BT-5 BT-7 BT-7A BT-7M (BT-8)
Number built 620 2,108 4,965 154 790
crew 3 3 3 3 3
weight 10.2 t 11.5 t 14 t 14.5 t 14.7 t
length 5.58 m 5.58 m 5.66 m 5.66 m 5.66 m
width 2.23 m 2.23 m 2.29 m 2.29 m 2.29 m
height 2.20 m 2.25 m 2.42 m 2.52 m 2.42 m
armour 6–13 mm 6–13 mm 6–13 mm 6–13 mm 6–22 mm
main gun 37 mm
Model 30
45 mm
Model 32
45 mm
Model 35
76.2mm
Model 27/32
45 mm
Model 38
main gun
ammunition
96 rounds 115 rouds 146 rounds 50 rounds 146 rounds
machine guns DT DT DT 2×DT 3×DT
engine power
model
400 hp
Liberty
400 hp
M-5
500 hp
M-17T
500 hp
M-17T
450 hp
V-2
fuel 400 l
gasoline
360 l
gasoline
620 l
gasoline
620 l
gasoline
620+170 l
diesel
road speed 100 km/h (62 mph) 72 km/h (45 mph) 86 km/h (53 mph) 86 km/h (53 mph) 86 km/h (53 mph)
power:weight 39 hp/t 35 hp/t 36 hp/t 34 hp/t 31 hp/t
road range 300 km 200 km 250 km 250 km 700 km
tactical range 100 km 90 km 120 km 120 km 400 km


Historical Gallery

Sources and External Links

USSR
Light Tanks IMS-1 IIBT-2 IIT-26 IIT-60 IITetrarch IIIBT-7 IIIBT-SV IIIM3 Light IIIT-127 IIIT-46 IIIT-70 IVA-20 IVT-50 IVT-80 IVValentine II VIMT-25 VIILTTB VIIIT-54 ltwt.
Medium Tanks IVT-28 VMatilda IV VT-34 VIA-43 VIT-34-85 VISpectre VIT-34-88 VIIA-44 VIIKV-13 VIIT-43 VIIT-44-122 VIIIObject 416 VIIIT-44 IXObject 430 Version II IXT-54 XObject 140 XObject 430 XT-62A
Heavy Tanks VChurchill III VKV-1S VKV-220 VKV-1 VIKV-2 VIKV-85 VIT-150 VIIIS VIIKV-3 VIIIIS-3 VIIIIS-6 VIIIKV-5 VIIIKV-4 IXIS-8 IXST-I XIS-4 XIS-7
Tank Destroyers IIAT-1 IIISU-76 IIISU-76I IVSU-85B VSU-85 VSU-85I VISU-100 VISU-100Y VIISU-152 VIISU-100M1 VIISU-122-44 VIIIISU-152 VIIISU-101 IXObject 704 IXSU-122-54 XObject 263 XObject 268
Self-Propelled Artillery IISU-18 IIISU-26 IVSU-5 VSU-122A VISU-8 VIIS-51 VIISU-14-1 VIIISU-14-2 IX212A XObject 261
Light Tanks
USA IT1 Cunningham IIM2 Light Tank IIT1E6-X IIT1E6-X1 IIT2 Light Tank IIT7 Combat Car IIIM22 Locust IIIM3 Stuart IIIMTLS-1G14 IVM5 Stuart VM24 Chaffee VIT21 VIT37 VIIM41 Walker Bulldog VIIT71 VIIIM41B Brazilian Bulldog VIIIT49
UK IICruiser Mk. I IICruiser Mk. III IIICruiser Mk. IV IIICruiser Mk. II IVValentine IVCovenanter VCrusader
Germany ILeichttraktor IIPz.Kpfw. 38H 735 (f) IIPz.Kpfw. 35 (t) IIPz.Kpfw. I IIPz.Kpfw. II IIIPz.Kpfw. 38 (t) IIIPz.Kpfw. III Ausf. A IIIPz.Kpfw. II Ausf. J IIIPz.Kpfw. I Ausf. C IIIPz.Kpfw. II Ausf. G IIIT-15 IVPz.Kpfw. 38 (t) n.A. IVPz.Kpfw. II Luchs VVK 16.02 Leopard VIVK 28.01 VIIAufklärungspanzer Panther VIIISpähpanzer Ru 251
France IRenault FT IID1 IIHotchkiss H35 IIIAMX 38 IVAMX 40 VELC AMX VIAMX 12 t VIF224 AMX Chaffee VIIAMX 13 75 VIIIAMX 13 90
USSR IMS-1 IIBT-2 IIT-26 IIT-60 IITetrarch IIIBT-7 IIIBT-SV IIIM3 Light IIIT-127 IIIT-46 IIIT-70 IVA-20 IVT-50 IVT-80 IVValentine II VIMT-25 VIILTTB VIIIT-54 ltwt.
China IRenault NC-31 IIVickers Mk. E Type B IIIType 2597 Chi-Ha IVM5A1 Stuart VI59-16 VIType 64 VIIWZ-131 VIIIWZ-132
Japan IRenault Otsu IIType 95 Ha-Go IIIType 98 Ke-Ni IVType 5 Ke-Ho
Czechoslovakia
Sweden