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Kastel Dynamic M-77 "Sand Viper"

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Final Production Model

Overview:

The M-77 Sand Viper is a modern, low-profile main battle tank designed for desert operations and rapid deployment forces. Evolving from a bulkier prototype, the final production model keeps its 200mm main cannon but integrates a sleeker, more modular turret design. It emphasizes agility, modular armor, and a lightweight frame, making it ideal for mobile warfare in harsh terrain.

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One of the only tank where the main frame is made with composite material (Forged carbon and titanium)

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Specifications:

General:

Name: M-77 Sand Viper

Type: Main Battle Tank (MBT)

Origin: [United States Of America]

Crew: 4 (Commander, Gunner, recon officer, Driver)

Combat Role: Agile frontline tank / desert warfare specialist

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Dimensions:

Length (rear bumper to turret end): 11.0 m

Width: 4.3 m

Height (ground to turret roof): 2.4 m

Weight (dry): 26,000 kg (26 metric tons)

Combat Weight (with armor, ammo, fuel): ~30–32 tons (est.)

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Mobility:

Engine: Turbocharged diesel V12 (approx. 1,500 hp)

Top Speed: 67 km/h

Power-to-Weight Ratio (dry): ~46-52 hp/ton

Transmission: 7-speed automatic

Suspension: Active hydropneumatic

Operational Range: ~450–500 km

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Armament:

Primary Gun: 200mm L/50 smoothbore cannon

Auto-loader system with rear bustle magazine

Ammo Types: APFSDS, HEAT, Airburst, HESH

Coaxial Armament: 7.62mm machine gun

Commander’s RWS: 12.7mm heavy machine gun

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Fire Control & Optics:

Gen-3++ Fire Control System

Thermal imaging & night vision

Laser rangefinder + ballistic computer

Commander independent sight (hunter-killer capable)

Integrated AI-assisted tracking

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Protection:

Armor: Modular composite armor with sloped geometry

Turret Frontal Protection: Up to 900mm RHAe equivalent

Optional Add-ons:

Explosive Reactive Armor (ERA)

Active Protection System (APS) – hard-kill capable

Flares

Additional:

NBC protection

Fire suppression system

Spall liners inside crew compartment

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Special Features:

Compact turret despite large-caliber gun

Modular construction for rapid field repair or upgrades

Sand filters and cooling for hot climates

Designed for high reliability and ease of maintenance

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Activation Groups :

-AG1 Hazard light
-AG2 None
-AG3 Driver Hatch
-AG4 Headlight
-AG5 None
-AG6 None
-AG7 Weapons and turret rotator
-AG8 Engine

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Controls

YAW to Steer
Pitch to Accelerate
Trim to adjust Cannon angle
VTOL to adjust Turret rotation

That's all, thanks