B-41 Main Battle Tank

An example of a B-41 tank.

## Production History

### Designed By

•OKB Lezovagonzavod Design Bureau (organisation)•Leonov Viktorivich Chizhnikov (lead design)

## Propulsion and Performance

### Engine

KhontAMZ M-25VK diesel engine; 600 kW (1 x 2)

### Transmission

Synchromesh 5-speed manual geared transmission

## Armament

### Main Armament

2A31 119.7mm/55 Rifled Main Gun; 40 rounds

###### *From: Equipment of the Russian Ground Forces*

The **B-41** (*Rossi:* *Броневайна Образца 41, Bronevayna Obraztsa 47, "Fighting Vehicle Sample 41"*) designated the **Object 620** is a Russian heavy tank developed mid-late 1st Great Cryptid War. Some foreign defense commentators have often considered it as the ‘first-generation’ main battle tank in Russia. It’s distinct pike nose design, semi-hemispherical cast turret became the mainstay of future Russian main battle tank designs. These tanks were well known as well for their twin-gun turret variants (B-41UD) which would influence future tank design in the Russian Ground Forces. It saw extensive use as a lighter compliment to the B-47 which served as a “bulk” to these heavy tank squadrons. Designed and manufactured in the OKB Lezovagonzavod design bureau, this vehicle was equipped with innovative features such as the earliest example of an autoloader, the 3V-22S assisted loading device which was in truth, not a faithful autoloader system as it required extensive gunner-loader input to load the shells and propellants however it still effectively decreases the expected reload time from the B-41's powerful 119.7 / 74.1-2mm guns.

The B-41s enjoyed their service as the eventual mainstay tank of the Russian Ground Forces during the 1850s up to the 1930s. It's general specifications primarily lacked much changed throughout their service with exception of internal systems, which was frequently towards electronics, weapon systems or even production methods which was aimed towards making these tanks easier and quicker to build. It's development eventually led to the creation of the B-47, which was evolved to the B-50/52.

## Background

    The B-41 started development by the late (O.S.) 1848 by OKB Lezovagonzavod design nureau in Lezhenogorod by renown tank designer Leonov Chizhnikov. The first prototype was built in Lezovagonzavod Works, in Factory No. 951 and left for Sarovsnigrad for state trials in (O.S.) 1850. This tank was a product of a need for a complete overhaul in the Russian Ground Forces' armoured doctrine, as in the mid 1800s the most numerous tank model of the RGF tank forces—the B-37/38, despite being sufficiently effective in essence the preceding tank is only a cavalry tank to the RGF's standards: fast-moving and lightweight, designed for maneuver warfare. This wasn't good enough for the RGF, as they had very lightweight armour, around 51.45 - 74.1 milimetres (1.5 - 2.16 As) of steel plate armour and was often easily attacked and disabled by cryptids at close quarters, and it's engine was often reported to easily overheat and catch fire. According to Major Llana Mitsukova when briefing the Russian Ground Force General Staff noted that their B-34s were:

> *...That the B-37/38 tanks were a product of a bygone era where we think everyday was our last. When what matters in this wretched war was the amount of guns we can bring to the front instead of the quality or capabilities...*
>
>

in her operations during the Battle of Ludiau in (O.S.) 1843.

The assignment of Leonov Chizhnikov as the lead design of OKB Lezovagonzavod Design Bureau's latest tank project to design a replacement for the B-41s made for a new and effective design within the span of two years. The prototype, designated P-40 impressed generals present in observing the vehicle during testing. The P-40 itself had a modified Model V-2 diesel engine and was specified with 1.1 arshets (278.3 milimeters) of armour, a 3.4 arsen (119.7 milimeter) gun, and extensive use of sloped armour measures. It's all-round sloped armour plates made it more effective against deflect shells in the event that the model were to engage against ballistic attacks, which was deemed controversial as it caused much discomfort with the turret's crew inside owing to the semi-hemispherical shape and the fact that Russia was not willing to engage with sovereign nations in order to focus on the Cryptid War. This was later mitigated with the final production model now the B-41 had increased it's height to 1.7 arshina (3 meters) and lighter armour which was paired with spaced armour to compensate.

## Design

### General Characteristics and Production

The B-41 represents a major shift of the Russian RGF's design doctrine which emphasised heavily on the use of good protection measures and thicker armour. The hull and turret had well-sloped armour, a fairly powerful engine and wide tracks, introducing new advanced features such as dual-drive transmission and torsion bar suspension which would've followed suceeding Russian tank design conventions of the mid-1850s Cryptid War era and further on. Still retaining many similar design elements of predecessor tanks of it's class such as the ZB-29 (*Rossi: Защищенная Броневайна Образца 25, Zashchishennaya Bronevayna Obraztsa 29, "Protected Fighting Vehicle Sample 29"*) with pikenose glacis shape, cabin layout and extensive use of simpler components. The B-41 is advanced for it's time, with a difficult production history, these tanks allowed the Russian Ground Force to produce larger and complex designs which was proven by future tank developments.

All of the B-41s cabin layouts are similar to the "arrow layout" of the late 1700s; three of the crew located in the turret consisting of:

* Commander at the right side
* Gunner on the left side
* Main loader behind the gunner

The turret crew is separate from the hull crew, consisting of:

* Driver at the hull
* Secondary loader behind the driver

This layout was the primary cabin design for Russian RGF tanks and was often uncomfortable for the turret crew, which was intensified by the B-41's use of a semi-hemispherical turret shape which significantly reduced headspace and made the crew prone to hitting the hull, the most common complaint for the crew on the P-40 prototype. The problem of tight crew space was eliminated with the enlargement of the production model's turret diameter two 2.3 arshets (0.56 meters) wider and height of the overall tank to 1.8 arshina (3.1 meters) to minimise the cramped nature of the B-41's arrow layout. The B-41 was noted for being quick to acquire targets, the commander was put on a raised adjustable seat ontop of an armoured cupola which both served as the vision ports and the turret for their 14.8mm gun, a traversable 10x30mm magnification protected periscope which was adapted from Lebensbraum armoured fighting techniques of "Heads Up" encouraging being the first to acquire their target.

In order to speed up production of the B-41's cycle. Factories were instructed to build these early models partially incomplete and used simplified alternatives to many mechanical systems in the tank. The loading mechanism of the original 119.7mm suffered a severe ergonomic shortfalls, as it lacked the assisted loading systems planned for the B-41A, instead a mechanically simpler stowage of the shells and propellants were in 25mm stamped steel ammunition boxes which were covered by a rubber mat same as the B-34's. This led to incredible discomfort and difficulty for the secondary loader to provide the ammunition as they were often at risk of being caught by the turret's drive mechanism, injuring and subsequently taking them out of action if not careful.

Wartime production exposed the B-41 tank to frequent imperfections in the armour, as production of these vehicles had very high production goals forcing many tank factories to cut corners in producing B-41s. This led partly to the poor welding which many Cryptids have found to exploit, this weakness was later solved with the introduction of the B-41 (O.S.) 1861 / B1 series tank, which included 20mm "Uruzuvsivchik" appliqué armour to cover up hull imperfections and subsequently increase overall protection of the tank.

These issues were corrected in 1855 with the introduction of the 3V-22S system in the B-41E/B1, which provided the turret a basket and a reliable loading mechanism that cuts down the original B-41A's 9 — 11 second reload time to 7 — 9 seconds.

### Quality of Life

For it's type the B-41 is a mechanically simple and robust system. It is simple to operate lacking much high standard training for crews. The B-41's larger size in comparison to preceding tanks also improves it's comfort for the crew especially at long-range operations, except for rough terrains which gives crew members motion sickness due to it's poor ride height on the torsion bar suspension. Their larger interior space improves the ergonomics while keeping the semi-hemispherical turret shape. The tanks had good mobility which was owed to their relatively light weight which makes it more easy to transport, wide tracks for better travel on soft ground and cold-weather start-up system to ensure that the B-41 can operate in cold conditions at extended periods of time.

The B-41 uses an air conditioner which allows the temperature control of the tank making it more comfortable for crewmembers which was connected to the tank's internal boiling vessel (IBV) on later models. When equipped with IBVs, the vehicle could remain ready for operation at all times by permitting crewmembers to heat and cook food by drawing heat from the B-41's temperature control system to brew various beverages (frequently tea and for washing) and heat up rations in order to keep the crew inside during breaks and keep them protected.

### Mechanical

The B-41 was powered by a single Sucha GVMS-1444 engine installed. The engine consists of a 32-valve double-overhead camshaft design angled 60o degrees with internal vials for glycol-water coolants. These engines displace 29 liters (1,100cu) using eight 146x146mm cylinders with an ability to output 2,160 Newton metres (1,000lb/ft) to 2,400 rpm. Each engine is capable of running two drive shafts for the B-41's dual-drive transmission and can produce 821.21 kilowatts (1101.2 horsepower) each in order to attain a top speed of 27 knots (51km/h). The fuel tanks for the B-41 provides the tank a combat range of 452.7 ardvets (261 kilometers) using their 500 liter (110 imperial gallons) petrol fuel tank.

The B-41s are equipped with air and fuel filters which allowed the air fed to the carburetors to be 99% free of any kinds of fouling. This filter was to be refurbíshed after each 1534.4 daleko (1000 kilometers) in optimal conditions, but when the conditions were difficult (high temperature, dust or cross-country terrain) this meant distance between filter change dropped to mere 433 ardvets (250 kilometers).

Early B-41s used a synchromesh 5-speed manual transmission; three forward and two back speeds. This allowed the B-41 to go at 9.7 knots (18km/h) at full reverse, this provided the tanks a greater advantage over some other tanks of the time which had some slower back speeds, this also improved their ability to maneuver in cramped urban or forest environments. Tank variants past the B-41B models were rebuilt in the (O.S.) 1880s with an automatic 10-speed gearset automatic transmission instead, making for better accommodation for the Sucha diesel engines installed onto the tank.

The engine compartment is also waterproofed, this was to allow the B-41 to ford through water, additional venting for the engines were installed onto the tanks in order to prevent an engine overheat. Other measures taken to reduce this problem included improving the coolant circulation inside the motor and adding a reinforced membrane spring to the fuel pump. Despite the risks of fire, the fighting compartment was relatively safe due to a solid firewall that separated it from the engine compartment.

The B-41 uses a torsion bar suspension system, this system was effective in their load bearing capacity which when paired with 2.08 arshets (500 milimeters) tank treads make them excellent moving through cross-country terrain especially soft ground due to good pressure owed to the suspension system. However this simple and robust system has it's limitations, as torsion bars lacked sufficient ride height and subjected the B-41 to terrible off-road ride performance. The crew would often experience violent swaying leading to sea sickness which was frequently described by tank veterans during their service.

### Protection

The B-41 uses fairly thick armour. The tank is built with cast steel armour and extensive use of steel bending in order to achieve it's distinct curved turret shape and pikenose glacis. It's armour made from hardened rolled homogenous armour (RHAe) with some later models using appliqué armour inserts of varying thickness either bolted or welded onto the hull and turret. Many tank crews praised the B-41 for it's excellent distribution of armour, reporting a sensation of "indestructibility" which both improved morale and reportedly gave the crew some incentives for some rather reckless behaviours such as drifting and other manoeuvres in the field.

In closer examination, the B-41 would use a variety of steel alloys which were on varying portions of the tank. Typically many aluminium and chromium based alloys would be extensively used for rolled and cast steel components between 1.4 arsen and 1.16 arshets (55 - 279.3 milimeters) which depended on which manufacturer produced the tank. A typical flat armour plate was a sandwich of heat-treated and untreated plates bound together by a thin 0.8mm air gap which was designed to both prevent penetration of armour-piercing shells and allow it to prevent spalling without sacrificing it's ability to maintain protective qualities.

It's use of angling further improved it's protective capabilities. Russia would donate two B-41A tanks to Lebensbraum for testing purposes in (O.S.) 1855. It was conclusive that the armour would prove that testing their 10cm guns would be inadequate at penetrating the thick armour of the B-41's glacis plates. According to addendums from that time, it was concluded that:

> Remarkably enough, our 100 milimetre anti-tank gun crews have reported firing four times consecutively against our singular test target at varying angles, it was able to ricochet twice with the rest making hits seemingly ineffective. At a range of five-hundred to one thousand metres would make these tanks almost unstoppable. Unless you hit it from the side.
>
>

Further examinations performed exposed some problems with the overall build qualities of early tanks, particularly in plate joins and welds. Many welding points were subject to leaking issues, a well placed shot in the joinery between both glacis plates would make for devastating damage against the tank as it could possibly collapse the plates. It was also reported that smaller calibre guns in the Lebensbraum arsenal such as their 50mm guns with AP shells at close range could wear down the tank's structural integrity much more significantly which was also frequently exploited by Cryptids during the war in the (O.S.) 1860s (460s A.C.)where they adapted to targetting the B-41As fielded by the Russians to cut through joints in the plating of the tank which frequently led to some drones breaking into the hull and killing the crew from within. The first models, the B-41A would be subjected to ridicule and even given the name "Deathtrap". Many of these deficiencies were not as pressing towards the Russian Ground Forces until the (O.S.) 1890s where the structural flaws of the B-41A would be solved with the introduction of later models.

## Ballistics

### Armament (B-41B2)

#### 2A31 119.7mm/55 A-19 Rifled Main Gun

The A-19 gun, GRAU designation: 2A31 is a Russian adaptation of the 119.7mm A-19 field gun which was developed in the late 1830s which was plenty in production at the time. It saw action in the B-41 as it's main armament and were subsequently installed in tank destroyers and future tanks in the Russian Ground Forces. These guns were designed to replace the outdated 74.1mm tank guns of the B-34. The gun is capable of being loaded with a variety of ammunition: APDS, APCR, HEAT-FS, HE-FRAG at a high 920m/s due to it's 3.9 arshina (6.6 meter) long rifled barrel reinforced with chromium and galvanised steel which improves their service life and prevent corrosion.

The B-41 uses a two-axis gun stabiliser, it's greater performance at firing on the move allows the tank to engage targets during manoeuvres. It also carries a total of 40 rounds for the main gun, with 6 rounds in the first ammo rack in the turret, with 20 rounds in a dispenser underneath the gunner's seat which was used for manual loading by either gunner or loader for the tank's secondary ammunition rack. This specific rack being affectionately nicknamed "The Tanker's Yoga Mat" due to the frequent twisting of the body that was needed to carry the shells onto the 3V-22S' carriage and rammer most reminiscent of Russian twisting movements. The remaining 20 rounds are found underneath in the space between the crew hull and the engines which the loader assist system can use to access and load the remaining embedded shells into. The average reloading on the B-41 would be around 7 — 11 seconds, depending on crew condition and if the model has a loading assist system.

###### Available Ammunition

Another first to this weapon and for the Russian Ground Forces was the usage of armour-piercing discarding sabot rounds which were designed to defeat enemy tank armour and also improve their capabilities against heavily armoured monster species. However it's primary anti-armour shell would use the **3BR-58** armour-piercing, capped, ballistic capped shell. The 3BR-58 weighed 28.4 t'syatsha (30 kilograms) using a dense cermet core encasing a small 1.3 radnik (97 grams) of VhK-19-1 (59% RDX, 40% TNT, 1% Wax) explosive filling from within along with it's high velocity allows it to defeat heavy armour.

• 202mm at 1km
• 241mm at 100m

The secondary anti-armour and the most common round type to be found on most B-41 loadouts would be the **3BK-101M** high-explosive anti-tank fin-stabilised round. This round was favoured over other tank shells available for the tank simply for it's multipurpose capabilities. The warhead has a strong effectiveness towards all targets, particularly against some fortifications, infantry and most of all, armoured targets.

Being a high-performance gun, the B-41's main gun gave it considerably greater muzzle velocity than the now obsolescent 80mm and 100mm guns fielded by the Russian RGF and it's contemporary tank guns compared for it's time. The gun could be depressed between -8° and +19° which automatically resets to a default angle called a "tank salute" during reloading which is performed by the stabiliser for improving the reload efficiency of the gun during use. Empty cartridges would be ejected through a small hatch on the left-hand side of the tank turret at the rear.

119.7mm guns on display in Borogorskiy, Russia.The interior of the B-41.Captured 119.7mm guns used by Tsing insurgents, Gansu Desert Southernlands.Ammunition types on display.

## Ballistics

### Armament (B-41UD)

#### 2A28 74.1mm/42.5 F-16 Rifled Main Gun

The 74.1mm F-16 gun, fitted on all the B-41UD variants of the tank. There are two of these guns fitted onto the turrets of the B-41UD versions and were designed to serve as an infantry support role. Fitted on a major part of the Russian B-41 tank fleet produced since (O.S.) 1850. The F-16 gun was particularly slow to reload and fire the guns at the same time, however these tanks could typically get off some four to six shots by a method of 'bracket firing' (a method of firing with a ready shell on either/or the second main gun or the tray for the shells.) in a shorter period of time. When fighting at normal combat ranges, these guns would prove effective against light fortifications and infantry at a range of 1.73 ardvets (1,000 meters). However the gun sights and rangefinding for the B-41UD's turret were rather uncomfortable, the turrets despite being very large and the guns are smaller, the amount of space needed to fit the 3V-22S loading system which affected accuracy and ability to engage at longer ranges. As a result of the B-41UD's two-man turret to fit the gunner and loader forced the commander to be relocated to the front next to the driver.

Lebensbraum forces noted that these tanks were much more slower to find and engage targets, the B-41UD would be surprisingly good at thinning out hordes. These guns greatly increased the firepower needed of the Russian Ground Force troops during advances. As the Cryptid War progressed many methods to using the B-41UDs have been created and used in armoured strategy with the most common methods of engaging Cryptid hordes such as 'autopilot barrage' (setting the 74.1mm guns at a specific angle and continuously fire-and-reload while moving forward slowly with the pace of infantry without the need for correcting aiming), 'one-two punch' (hitting a specific part of a target with one gun, and firing at the same place with the other) and other methods which allows the B-41UD to become an effective infantry support weapon.

###### Available Ammunition

The 74.1mm guns used ammunitions of fixed shell type. These shells frequently retained a number of 74.1mm shells from older Russian inventory of 74mm shells which were refitted in new cartridge bodies towards the 2A28 for use. While these shells were a conversion of ammunition from guns of the same calibre the modern 3VOF-126 high-explosive fragmentation shell which was designed towards the defeat of many soft armoured ground and land targets.

## Production History

### Designed By

• OKB Lezovagonzavod Design Bureau (organisation)• Leonov Viktorivich Chizhnikov (lead design)

## Propulsion and Performance

### Engine

Sucha GVMS-1444 diesel engine; 821.21 kW (1 x 1)

### Transmission

Planetary 10-speed gearset automatic transmission

## Protection

### Armour

Hull — turret• 216 — 505 mm vs. Chemical

• 113 — 455 mm vs. Kinetic

## Armament

### Main Armament

2A31 119.7mm/55 Rifled Main Gun; 40 rounds

# B-41B2

###### *Main Article: B-41B2*

The B-41B2 heavy tank was a major rebuilding of the original B-41A. The tank being built off the existing B-41B1 hulls were considered a second-generation main battle tank that was introduced in the early (O.S.) 1900s initially for serving in a number of Russian Strategic Defence Force (RSDF) and eventually to the rest of the Russian Ground Forces. Whilst the B-41B and B-41A models deployed in the 1st Great Cryptid War fronts were supported by infantry in motorised units, the B-41B2 was better suited towards in usually independent heavy tank battalions, an advanced counterpart to match the B-47, the B-41B2 introduced advanced steel-ceramic type composite armours, a new Sucha diesel engine, a reworked electrical system and transmission and a new advanced 1S108 'Krevetka' optical tracking system.

These features allowed the B-41B2 to better work independently and engage enemy humanoid tanks, however made the B-41B2 somewhat more expensive to build, more significantly so with the tank's power system and radar, which was for it's sophistication made widespread service needing to be initially be locked with the RSDF. By regular Russian industrial standards of the time, the B-41B2s were often considered over-engineered, as the new technologies integrated into the tanks posed new challenges for the Russian heavy industry. Needing to produce heavier armour than any main battle tank that has entered service in the RGF to date, due to their expense and short supply, many B-41B2s were given spaced armour inserts instead which was a stopgap solution after many defective composite armour plates made such armour not being able to live up to expectations.

Additional political pressure from many liberal parties in the Winter Palace pressed B-41B2s to enter service. Resistance from high command in the RSDF had made concerns regarding high production costs of these tanks were immediately overcame with the increased budget of the RSDF allocated under the (O.S.) 1891 fiscal year budget, which was personally headed by Madame Iolanta E. Kozlova, believing that the development of Russian heavy tanks were paramount to the achievement of Russian military victory.

After Italy's surprise invasion of Russia on (O.S.) 15 Iyul 1893, the Italian rapid advances forced the development of the B-41B2 to be halted. Eventually cancelled as MyZ LezoVagonZavod was pressed into producing more B-41B tanks instead. With factories being rushed to deploy more tanks and troops towards the Severnaya Verf fronts to protect Russia's largest shipbuilding complexes in the Altay Strait.

Russian designers were aware of the design deficiencies in the tank in combat, testing and remedies and new design measures to better suit the changing focuses in the Russian military of the time made to improve the B-41B2's design. Over the span of seven years, the production of B-41B2s begun to ramp up following the end of the Italian invasion, a further 2,870 B-41B2s would be built and delivered into service.

### Capabilities

The B-41B2 still keeps it's cabin layout design which by then would be a regular design measure by the time, the tank would still keep it's initial general appearance.

#### Firepower

* The B-41B2 retains it's 2A31 119.7mm/55 tank gun which is loaded with the 3V-22M3 semi-automatic loader. The loading system with projectiles located in a turret bustle at the rear and an ammo rack in the middle of the tank.
* The B-41B2UD variants also uses two 2A28 74.1mm/42.5 tank guns in a twin-gun turret which uses a modification of the original 3V-22S loading system.
	+ The B-41B2's available ammunition uses a variety of ammunition: APDS, APCR, HEAT-FS, HE-FRAG. It's main round, the 3BK-101M can penetrate 405mm of RHAe, 40 rounds were stowed on the tank however there are spaces for adding additional 50-60 rounds.
* The B-41B2's advanced electronics gave for some good vision for crew and added an edge to close, 200-400 metre engagements due to it's 1S108 radar illuminator.
* The main guns and sights are all stabilised.

#### Protection

* B-41B2s were better protected than any preceding Russian tank, using well-sloped, thick 119.7 to 329 millimetre cast steel armour which is supplemented by 20 millimetre 'Uruzuvsivchik' spaced armour and steel-ceramic composite armour inserts.
* B-41B2 semi-automatic loader systems allow for improved protection in the event of an ammunition cookoff as ammo were in wet-racks in protected boxes, with turret bustles being equipped with blowout panels.
	+ The usage of a semi-automatic loader allows the removal of a fifth crewmember which would've been needed for a tank equipped with a 119.7mm or twin 74.1mm guns, which also improved the survivability of the crew and cuts training costs for additional personnel.

#### Movement

* Due to the B-41B2's significantly larger size and weight increase, the tank had inferior mobility compared to it's faster counterparts.
	+ The increased weight also made for an increased wear on suspension, making the B-41B2's practical range slightly lesser than B-41B1s.

## Variants

### Russia / USSR

* **B-41A (Ob'yekt 620)** – The first production model lacking the two-plane stabiliser and the assisted loading device (including turret basket). It was well recieved in it's introduction in (O.S.) 1850. It was distinct for it's singular wide infrared spotlight located atop it's gun mantle. It was phased out due to it's flawed hull structure.
	+ **B-41K (Ob'yekt 621)** – The commander's version of the B-41. It uses more sophisticated electronics, using an improved radio system, an antenna base atop the turret and navigational aids. This was designed to be used by unit commanders.
	+ **B-41UD (Ob'yekt 622)** – Infantry support version of the B-41's regular variant. It is designed with a modified turret front and crew compartments to accomodate the fitting of two 74.1mm rifled guns for better engagements against Cryptid hordes, human wave and some insurgent tactics.
		- **B-41A (O.S.) 1861 (Ob'yekt 620/2-1)** – A slightly modified version of the stock B-41A designed and built by MyZ Lezovagonzavod Works. It was fitted with a 100mm half-lap joinery and 'Uruzuvsivchik' 20mm appliqué armour package. An additional improvement to the fording equipment for easier installment and a slightly modified engine deck included. This model would be used as the standard version of the B-41 since (O.S.) 1861
			* **B-41A (O.S.) 1863 (Ob'yekt 620/2-2)** – A modification of the B-41 in the same vein as B-41A (O.S.) 1861 made in Sarovsnigrad. It was fitted with a 90mm rocket on a rail on the upper right hand side of the turret with appliqué and spaced armour additions on the rear of the turret.
				+ **B-41A (O.S.) 1864 (Ob'yekt 620/2-3)** – A minor modification that widened the top turret hatches and replaced the Gryffyn-35 20mm gun with a 12.5mm machine gun. It was incorrectly called the B-41A (O.S.) 1863 for it's minor features difficult to identify.
* **B-41B (Ob'yekt 623)** – Primary production version of the B-41. This tank model introduces the two-plane stabiliser, assisted loading device. Many B-41A (O.S.) 1861 models were rebuilt to the B-41B standard.
	+ **B-41K (Ob'yekt 624)** – The commander's version of the B-41. It uses more sophisticated electronics, using an improved radio system, an antenna base atop the turret and navigational aids. This was designed to be used by unit commanders.
	+ **B-41B1/2UD (Ob'yekt 625)** – Infantry support version of the B-41's regular variant. It is designed with a modified turret front and crew compartments to accomodate the fitting of two 74.1mm rifled guns for better engagements against Cryptid hordes, human wave and some insurgent tactics.
		- **B-41E/B1** **(Ob'yekt 623/2-1)** – Modernised version of the B-41B. Some 'Uruzuvsivchik' appliqué armour inserts were replaced by spaced armour and gill skirts. This model also shared electronic systems with the B-47 main battle tank.
			* **B-41B2** **(Ob'yekt 623/2-2)** – Further improved version of the B-41B1. This tank recieved composite armour appliqués on the turret cheek, a radar rangefinder and modernised version of the B-41B1's electronics systems. The 119.7mm rifled gun was replaced with a lower calibre smoothbore one for new superior ammunitions.

### Venerya

* **B-41V (Ob'yekt 620/4)** – A slightly modified version in service with Russian allies, primary operator: Venerya.

## Specifications (B-41B2)

*All data from: Navalpunk #accepted-technologies.*

#### Dimensions

* Length: 7.8 meters (without gun length)
	+ 10 meters (with gun length)
* Width: 3.4 meters
* Height: 3.15 meters
* Weight: 61.7 tonnes

#### Crew

* Driver
* Commander
* Gunner
* Loader / Machine Gunner

#### Propulsion

* Powerplant: Sucha GVMS-1444 12-cyl. water-cooled diesel engine; 1,116.5 mhp (821.21 kW) at 2,400 rpm. (1 x 2)
* Power-to-weight Ratio: 13.4 mhp / t
* Transmission: planetary 10-speed gearset automatic transmission
* Suspension: torsion bar

#### Performance

* Maximum Speed: 51 km/h (27.5 kn) at road
	+ 28 km/h (15.1 kn) off-road
	+ 7 km/h (3.7 kn) fording
* Ground Pressure: 0.72 kgf/cm2
* Operational Range: 261 — 470km (135—253 nmi), (with additional fuel tanks)

#### Armament:

* 2A31 119.7mm/55 A-19 gun with 3V-22M3 semi-automatic loader; 6 — 11 second reload, 6 ready shots and 34 embedded rounds. (1 x 1)
	+ Twin-axis gun stabiliser; -9o — +19o vertical guidance.
	+ Ammunition types vary, but is all available for: (see available ammunition)

or:

* 2A28 74.1mm/42.5 F-16 gun with 3V-22S semi-automatic loader; 7 — 12 second reload, 12 first-rack rounds and 28 embedded rounds. (1 x 2)
	+ Twin-axis hydraulic gun stabiliser; -6o — +16o vertical guidance.
	+ Ammunition types vary, but is all available for: (see available ammunition)

* 6P41 KPV 14.8mm heavy machine gun in enclosed turret; belt-fed chambered in 14.8x126mmKd, 900 rounds. (1 x 1)
* 6P52 Korchagin PVKM 7.41mm coaxial machine gun in coaxial and pintle-mount; belt-fed chambered in 7.41x63mm, 4,500 rounds (1 x 2)

* 3D6 90mm smoke dispenser charges (6 x 2)

#### Armour

* 3-layer composite appliqué armour (steel-fibreglass sandwich) with a thickness of 90 mm.
	+ Front hull — 90 mm composite, 119.7 mm steel
	+ Side hull — 65 mm steel
	+ Rear hull — 35 mm steel
	+ Turret — 90 mm composite, 329 mm steel
* 'Uruzuvsivchik' 20 mm thick appliqués covering:
	+ Turret side-rear
	+ Hull side-rear
* Gill skirts covering:
	+ Hull side front
* Lateral rubber skirts protecting the suspension

* 212 mm — 505 mm vs chemical
* 116 mm — 455 mm vs kinetic

CBRN; chemical warfare detection and overpressure protection

#### Electronics and Processing Systems

* 1Uo23 fire-control system with:
	+ URD 119C radar control for anti-tank missiles.
	+ 1V800 ballistic computer for electro-optical tracking and automatic lead.
		- 1S108 'Krevetka' fire-control radar for electro-optical tracking and limited radar illumination.
	+ 2E22 STP-1 twin-axis hydraulic gun stabiliser; vertical range −8° to +18°
* The commander's cupola is fitted with:
	+ PK-4M commander's day sight; 10x magnification, fully traversible.
	+ TPKU-1B2 night vision sight; 10.5x30 magnification
	+ 1Uo23 integrated remote gun control
* The gunner's battlestation is fitted with:
	+ TSh1A-18P sight; 10.5x30 magnification
	+ TPN-1 night sight; 10.5x30 magnification

* L4M 'Luna' / L2N infrared illuminators; 600 — 800 meter range.

## See Also

* Equipment of the Russian Ground Forces
* Russian Ground Forces

###### Tanks of comparable, role and era

* Rath A6/7
* JF-7H Centurion
* Valiant Medium 105
* WZ-55 Battlemaster

## References

* https://en.wikipedia.org/wiki/IS-3\_(tank)
* https://en.wikipedia.org/wiki/IS-7
* https://en.wikipedia.org/wiki/T-10\_tank
* https://en.wikipedia.org/wiki/T95\_Medium\_Tank