UC-42 Léon

UC-42 Léon
An Exersito Iverica UC-42 in 2017
Type	Main battle tank
Place of origin	Iverica
Service history
In service	2008-present
Used by	Duchy of Verde Gallambria Girkmand Greater Galicia Iverica
Production history
Designer	Arx Arms Manufacturing
Designed	2004-2007 (A1)
Manufacturer	Arx Arms Manufacturing
Unit cost	A1: $10.5 million (FY2021) A2: $13.5 million (FY2021) E1: $9.5 million (FY2021) U1: $14 million (FY2021)
Produced	A1: 2008-present
No. built	911
Variants	UC-42-A1 UC-42-A2 UC-42-E1 UC-42-U1
Specifications
Weight	42 tonnes (Level I: baseline armour) 48 tonnes (Level II: composite applique) 51 tonnes (Level III: composite & ERA)
Length	9.48 m (31.1 ft) (gun forward) 8.25 m (27.1 ft) (hull only)
Width	3.4 m (11 ft) 3.7 m (12 ft) (Level-III applique)
Height	2.30 m (7.5 ft) (max) 2 m (6.6 ft) (min)
Crew	3 (commander, gunner, driver)
Armor	Level-I: Toledo Composite Pattern 3 (nano-metric steel with composites) Level-II: applique ceramic composite armor Additional applique explosive reactive armour
Main armament	A1, E1: 120mm L/44 ARX 120-4 LSG smoothbore gun A2, U1: 128 mm L/41 ARX 128-1 LSG smoothbore gun
Secondary armament	1 × 8.6 mm machine gun (coaxial) 1 × 12.7 mm (RWS)
Engine	A1, E1: Toledo Heavy Industries 4D8CV 4-stroke 22.6-litre diesel V8 engine A2, U1: Toledo Heavy Industries Gen-2 4D8CV-CD 4-stroke 22.6-litre diesel V8 engine 1,200 hp (890 kW)/2300 rpm
Power/weight	Baseline: 28.57 hp/tonne Level-II: 25 hp/tonne
Transmission	Continuously variable transmission
Suspension	hydropneumatic suspension
Operational range	A1 (Level-II): 480 km (300 mi) A2 (Level-II): 520 km (320 mi)
Speed	Road: 70 km/h (43 mph) Off road: 70 km/h (43 mph)
Steering system	Drive by wire

The UC-42 Léon is a fourth-generation main battle tank produced by Arx Arms Manufacturing Co. A result of the Universal Combat Vehicle (UCV) Programme, the tank entered service in 2008 with the Iverican Republican Armed Service. The UC-42 is equipped for Network-centric warfare in addition to its ability to engage vehicles at stand-off ranges. The UC-42 also features advanced sensors such as radar and infrared systems that contribute to its survivability.

History

In 1999, the Iverican Office of Military Technology was tasked to conduct a study on the effectiveness of the Arx G-58 in-service as the primary main battle tank of the Iverican Army and the Republican Marine Regiments. The study found that poor fuel economy coupled with the system's high tonnage made its deployment in hilly, mountainous and coastal areas of Iverica difficult. Furthermore, the Iverican Navy had previously noted the transportation challenge the vehicle's dimensions and mass posed to amphibious operations in foreign training theatres.

By 2001, the Ministry of Defence requested tenders from Iverican military land system designers. Among the participating companies was Arx Arms Manufacturing, which had been developing the Universal Combat Vehicle programme modules and chassis designs since 1991. Design requirements were particularly strict on a 40-tonne baseline weight, a gun armament that must penentrate armour exceeding 1200mm in effective thickness using a sabot projectile also capable of firing gun-launched ATGMs, a top-speed of at least 65 kph, and internal accomodations for the newly developed Nousphera C4I system.

After a deliberation process wherein the Office of Military Technology and Ministry of Defence reviewed tenders submitted by contender entries from Cavallero Heavy Auto and Granada DynamiCo, Arx Arms was awarded the contract. After a lengthy post-bid review process, development was allowed to begin in January of 2004.

[TBA]

Design

The UC-42 is a 42-tonne metric tonne main battle tank built to be compatible with many Universal Combat Vehicle modules. The chassis allows for reduction of weight or instalments of modular kits for greater armour protection, electronic warfare, and C4I roles. It is designed especially to handle mountainous or archipelagic topography with hydraulic-pneumatic suspension and a high power-to-weight ratio. Design objectives included an emphasis on mobility and modularity to allow for more efficient and more economic logistical handling in air-mobile and amphibious scenarios.

The main armament is a 12.8 cm ARX smoothbore gun capable of firing MP-T, APFSDS, HEAT, and ATGM ammunition. The Léon may also carry additional pintle-mounted 12.7mm heavy machinegun. Protection includes a 2 additional levels of applique protection including ballistic-ceramic composite and explosive-reactive armour.

Crew safety measures include CBRN protection, a FM-200 fire-suppression system, and bulkhead separation and blow-off panels for ammunition storage. For protection against enemy fire, the UC-42 uses a hard-kill active protection system.

Sensors include J-Band multifunction radar, an AESA pulse-doppler fire-control radar for an Active Protection System and infrared warning and proximity sensors.

[Edits required]

Protection

Armour
The UC-42's baseline armour is constructed from nano-metric steel panels laminated with 2 layers of steel composites. Elastomer layers are pressed between two high-hardness steel strike faces to help distribute forces across the area of the plate. The outer surface is coated in slip-resistant fiberglass and a thin polymer that adds some thermal-reflective and radar-absorbing properties. A fiber-resin spall liner is added to sections of armor exposed to the fighting compartment and driver's compartment.

Applique armour is available in 2 forms: composite and explosive-reactive. The UC-42's Level-II armour consists of 6-tonnes of composite steel outer layers encasing spaced and angled ballistic-ceramic plates. Square-hollow steel reinforcement helps protect against deformation, displacement, or warping. The Level-II segments added to the turret are also shaped to reduce the UC-42's radar cross-section. Level-III consists of Level-II armour with added explosive-reactive armour tiles to the sides of the hull and the lower front glacis plate. Level-III's ERA additions can be limited to only 1 layer of ERA, adding only 1.5 tonnes of weight. A second layer is added to further increase survivability against heavy tandem shaped charge munitions. At its full configuration, a combat-loaded UC-42 with Level-III would have a mass of 51 tonnes.

Active Protection System
The UC-42 is equipped with the Dahlbein Defence Interfector active protection system. Interfector is a hard-kill system that utlises explosively formed penetrators (EFP) guided by an F/G-Band fire-control radar. The RI/VPG-040 guiding the system's 2 launchers is a four-faced distributed active electronically scanned array Pulse Doppler radar designed to detect and automatically track Anti-Tank Rockets, Anti-Tank Guided Missiles and Tank Rounds. A cone of EFPs are fired at an incoming threat, intended to detonate the warhead at a safe proximity.

Infrared Sensors
The UC-42-A2 is equipped with an array of infrared transceivers. Initially esigned as an alternative to the APS' fire control radar, the Sense-6 Infrared Proximity Warning Sensor is composed of 6 transceivers and a computer. Each sensor passively scans a 70 x 70 degree area infront of it to detect thermal signatures and dense, opaque obstructions. When a thermal profile matching a missile or rocket is detected, Sense-6's computer system can trigger the Interfector APS launchers. Sense-6 is also effective at detecting enemy laser marking and can act as an electro-optical disruptor against range-finders, designators, and ATGMs reliant on laser guidance. Sense-6 can also function as a close-quarters infantry sensor for the crew, to detect if infantry are moving around the vehicle; this can reduce the risk of driving accidents or warn the crew of potentially hostile infantry. Though initially selected for use on the UC-42, reliability concerns and false-trigger accidents resulted in the disabling of Sense-6's fire-control function.

Countermeasures
60mm Smoke launchers [TBA]

Other Passive Measures
UC-42-A2 variants are equipped with an extra liquid cooling system for the engine and a 2-vent exhaust system that reduces the vehicle's thermal signature by cooling the exhaust. Heat is diffused in the pipes by a fan heatskink and a short convection heat exchanger segment. Gases exit on both flanks of the tanks rear. The A2 variant cylinder deactivation feature also lowers the UC-42's noise when idling and at low RPM levels to a range of 50-60 decibels.

Mobility

Engine
All variants of the UC-42 are equipped with a 4-stroke V8 diesel engine. It is a high-displacement, high-compression, liquid-cooled, naturally-aspirated engine rated to output 1200 horsepower at 2300 RPM and a maximum torque of 3880 Nm . The engine is classified as the Type 4D8CV, part of a family of engines used in Universal Combat Vehicles in the weight range of 30-50 tonnes. 4D8CV engines use a 60 degree V-block arrangement and Intelligent Variable Timing and Lift Electronic Control I-VTEC. Units produced for UCVs utilise a high percentage of niobium in the engine block, cylinder head, and piston assembly. The entire engine minus its liquid cooling system weighs 2000 kilograms. The engine can be turbocharged or supercharged, as in the UC-42-U1 Urban Assault Vehicle. However, most Uses computer-controlled valves for cylinder deactivation on lower RPM levels. Natural aspiration was chosen for most variants to conserve fuel economy.

A2 units are equipped with cylinder deactivation feature to increase fuel efficiency when out of combat. When activated, the system will stop injecting fuel into 2 or three of the valves. During this operation, the valves are fully closed to compress air inside the cylinder during the exhaust stroke. The compressed air expands during the succeeding downward stroke to recover some of the energy thus decreasing the load a totally inactive cylinder would add to the operation. A further measure that contributes to fuel efficiency comes in the form of an extra heatsink fan in the exhaust. The fan's pressure allows it to double as an evacuator, helping outward gas flow.

The engine placement is offset, to the left-hand side of the central axis. It is adjacent to the rear left side of the fighting compartment. This is done to accomodate the an auxiliary power unit (APU) and parts of the exhaust cooling system and liquid cooling system. Further to the rear are 2 partioned self-sealing fuel tanks. The engine compartment contains part of the vehicles FM-200 fire suppression system which can be triggered automatically or manually using a trigger in the driver's station or in the commander's station.

All UC-42 variants are equipped with a continuously variable hydraulic mechanical transmission. This transmission allows the vehicle to reach its top speed in forward and reverse modes and allows for smooth transition in all speeds using a single lever.

Suspension
All variants are equipped with Hydropneumatic Active Suspension. The chassis rests on 5 torsion bars connected to 5 pairs of roadwheels by a suspension arm. A bolt, slotted into the suspension arm, is then moved by a belt driven pump from either the engine or APU to pressurise a special hydraulic fluid, which powers both the brakes and suspension. The extension and retraction of the bolt cause a rising or falling action. On the UC-42, this can be used to help lay the gun if the vehicle is resting on uneven surfaces. The UC-42's suspension allows for a maximun pitch of 10-degrees glacis-downward or glacis-upward.

Auxiliary Power Unit
The UC-42's APU is Mounted adjacent to the fighting compartment, on the front right-hand side of the engine compartment. The APU is a liquid cooled, multifuel, diesel generator capable of a maximum output of 22kW. The APU is capable of powering the suspension, optics, active protection system, ventilation, autoloader, driving controls, communications, and C4I systems. However, neither the multifunction radar nor the Sense-6 IR transceivers can function while the all former systems are active. All systems can be run simultaneously if the vehicle's main battery is switched on or if the engine is active on idle. A breaker switchboard to the lower right-hand side of the commander's station can be used to selectively power modules and subsystems.