ER-TRA.
Tri-Modular Tactical & Protected Mobility Platform
M Tactical · A Protected · Mechanical Diesel · Q355B Steel · STANAG 4569
Design Doctrine
Both tactical branches inherit a single engineering doctrine, deliberately modeled on the late-20th-century Toyota 70-series and Hilux platforms. Software-defined vehicles are rejected by program rule.
Mechanical Diesel
IDI · MECH INJECTION · NO CAN-BUS
Toyota-derived 1H/3L/5L families. Tolerates low-grade fuel and survives total electrical failure. Repairable with hand tools in any rural workshop.
Electronic Minimalism
ANALOG GAUGES · RELAY + FUSE LOGIC
No infotainment, no multiplexed wiring. Resistant to high-vibration, high-dust service and immune to ECU obsolescence in remote theaters.
Boxed Q355B Frame
HAND-WELDED · LOCAL FABRICATION
Q235B base with Q355B reinforcements at point loads. Fully repairable with SMAW/GMAW gear available in any provincial workshop.
Mobility Baseline
4×4 STD · PORTAL AXLES · DIFF LOCKS
Equivalent ground clearance to a 43-inch tire fit on a stock truck — without the unsprung mass or driveline torque penalty.
Tri-Modular Chassis Architecture
A standard ladder frame suffers excessive flex under the leverage of portal axles and large tires. The tri-modular approach divides the chassis into three structural zones — each fabricated from boxed Q355B steel and reinforced locally for its specific reaction loads.
Front Impact & Suspension Cradle
Boxed cradle supporting cab mounts, engine cradle, steering gear, and high-stress front suspension pickups. Sculpted kick-up provides clearance for portal-axle jounce and drag-link travel.
- Length zone
- 1.2 – 1.5 m
- Construction
- Boxed Q355B plate
- Function
- Point-load reaction
- Reinforcement
- Doubler plates
Torsion-Resistant Center Spine
Manages diagonal twisting forces over uneven terrain. Heavy-duty boxed rails and reinforced crossmembers deliver global rigidity for the drivetrain, transfer case, and primary driveshafts.
- Rail spacing
- 800 – 860 mm
- Rail section
- 200 × 75 × 5 mm
- Profile
- Boxed rectangular
- Function
- Global rigidity
Rear Mission & Load Module
Torsion-isolated subframe accepts flatbeds, command shelters, or medical boxes without coupling chassis flex into the habitation body. Mission-flexible by design.
- Coupling
- Isolated subframe
- Body types
- Flatbed · Box · Shelter
- Isolation
- Compliant mounts
- Function
- Mission flexibility
Variant Family
Two parallel branches share one cab, one frame family, and one engine doctrine. Capability differences are absorbed by bolt-on packs and trim tiers — never by clean-sheet divergence.
ER-TRACKER M
Tactical Carrier · Hard service · Remote patrol
Purpose-built tactical carrier for troop movement, logistics, and mission-critical support in austere theaters. Boxed Q355B frame with portal axles standard; mechanical diesel and analog electrics throughout.
- Overall length
- 3,850 – 4,250 mm
- Overall width
- 1,650 – 1,780 mm
- Ground clearance
- 300 – 380 mm
- Payload (tactical)
- 1,200 – 1,500 kg
- Fording target
- 600 – 800 mm
- M-BBase Tactical CarrierTroop / cargo
- M-PPlus Mission CarrierHD portals · heavy module
ER-TRACKER A
Protected Mobility · STANAG-1 baseline
Protected mobility platform — survivability and maintainability over maximalist armor. Floating floor, blast-attenuating seats, and modular composite/steel armor. STANAG 4569 Level 1 baseline; Level 2 via Protection-Ready Pack.
- Crew cell
- Hand-welded plate
- Floor strategy
- Suspended / side-mounted
- Glass
- Ballistic + spall liner
- Armor mat'l
- HHS + alumina / SiC
- Mobility
- Portal axles std
- A-PPatrolTroop transport
- A-LLogisticsConvoy resupply
- A-MEDMedicalCasualty evac
- A-CMDCommandMobile HQ
- A-ENGEngineerBlade / utility
- A-RECOVRecoveryVehicle salvage
Station Coordinates
- ST 0Front bumper plane0Datum baseline for all longitudinal measurements.
- ST 450Front impact crossmember450Supports winch cradle, tow points, and front recovery loads.
- ST 1100Front axle centerline1100Positioned slightly ahead of cab leading edge for steering clearance.
- ST 1350Front suspension reaction member1350High-stress member reacting radius-arm and link forces.
- ST 1800Engine cradle crossmember1800Mid-mounted engine placement for optimized front/rear weight balance.
- ST 2400Gearbox / transfer-case pivot2400Center torsion member — the structural heart of the spine.
- ST 4500Rear axle centerline4500Resultant 3400 mm wheelbase (4500 − 1100).
Powertrain — Mechanical Diesel
The powertrain is centered on the Toyota 1H-series inline-six diesel family. These engines are selected for field-proven mechanical injection — common-rail technology is rejected by program doctrine to ensure repairability in austere workshops without specialist diagnostics.
Toyota 1HZ
- Config
- I6 · NA · IDI
- Displacement
- 4,164 cc
- Output
- 129 hp / 96 kW
- Torque
- 271 – 285 Nm
Tolerant of contaminated and low-grade fuel. Flat torque curve and 500,000–700,000 km service life make it ideal for steady, dependable pulling power in austere environments.
Toyota 1HD-T
- Config
- I6 · Turbo · DI
- Displacement
- 4,164 cc
- Output
- 165 hp / 123 kW
- Torque
- 363 Nm
Preferred for sustained high-load operations: armored A-variant transport and steep highland logistics. Retains mechanical injection — no common-rail dependency.
Suspension — Portal Axle Dynamics
Portal axles raise the axle tube above the wheel hub, creating a longer lever arm that twists the housing under braking and acceleration. The chassis must react these forces without catastrophic failure or progressive fatigue at the suspension towers.
For a solid portal axle, a radius-arm and Panhard configuration is the most sensible front geometry: simple, proven, and packageable around the engine doghouse and steering column. Drag-link angle is carefully managed to suppress bump steer through the full jounce-rebound envelope.
Track width is widened to 1760–1780 mm to compensate for the elevated center of gravity introduced by the portal lift, preserving rollover resistance during high-articulation maneuvers.
- Axle type
- Solid portal
- Front geom.
- Radius arm + Panhard
- Steering box
- Hyd. recirculating ball
- Bump steer
- Drag-link managed
- Track width
- 1760 – 1780 mm
- Reinforcement
- Local doubler plates
Electrical Backbone
Tactical and protected variants run a 24 V backbone. By doubling voltage, current is halved (P = V·I) — enabling thinner harnesses, lower voltage drop across long runs, and standard NATO slave-start interoperability. CAN-bus and infotainment are explicitly rejected.
Protection · STANAG 4569
The A-branch targets STANAG 4569 Level 1 as the baseline posture, with Level 2 capability available through the Protection-Ready Pack. Composite tiles (alumina / silicon carbide) are layered over high-hardness steel in high-load areas to keep mass within mobility margin.
- Ballistic
- 7.62 × 51 mm NATO Ball (M80) at 30 m
- Blast / mine
- Hand grenades, small AP devices
- Material
- HHS plate · ballistic glass + spall liner
- Ballistic
- 7.62 × 39 mm API BZ at 30 m
- Blast / mine
- 6 kg explosive mass under any wheel / center
- Material
- HHS + alumina / SiC composite tiles
- 01Floating Floor
Suspended off side walls — no direct blast conduit.
- 02Blast Seats
Energy-absorbing, frame-decoupled occupant seating.
- 03Spall Liner
Aramid layer captures secondary fragmentation.
- 04Composite Armor
Ceramic over HHS in high-load zones for mass parity.
Mission Kits
The factory produces a single "clean" tactical truck. Mission roles are achieved through standardized bolt-on packs that interface with the rear mission deck grid, roof rails, and front/side hardpoints.
Recovery
Front winch cradle, reinforced rear tow structure, lifting accessories.
Comms Relay
Mast mount, alternator upgrade, electronics bay, battery reserve.
Medical (A-MED)
Stretcher rails, casualty interior, climate seal, blackout interior lighting.
Command (A-CMD)
Map table, comms racks, antenna farm, hardened crew interface.
Engineer (A-ENG)
Front blade attachment plate, brush prep, reinforced hardpoints.
Remote-Service
Fuel/water modules, field maintenance tools, spare lockers, shade canopy.
Dust / Heat
Cyclonic pre-cleaner, heavy-duty radiator, oversized seals.
Cold / Highland
Stronger cabin heater, battery blankets, front utility-blade plate.
Night / Signature
Blackout drive, convoy markers, IR-friendly lamps per STANAG 4381.
Localization Tiers
Manufacturing follows a deliberate three-tier phasing: fabrication-intensive structural work is localized first; precision drivetrain internals remain strategic imports until tooling matures. The doctrine leverages Asmara's historic mechanical workshop culture as a strategic asset.
Localize First
FRAME RAILS · CROSSMEMBERS · ARMORED CREW CELL · BODY PODS · SKIDS · BUMPERS
Fabrication-intensive components leveraging local welding (SMAW/GMAW) and metalworking skills. Reduces foreign-exchange burden immediately.
Hybrid Integration
INTERIOR TRIM · GLASS RETENTION · WIRING HARNESSES · FINAL ASSEMBLY
Localizes value-addition as quality-control and assembly systems mature. Trains the workforce for higher-precision tasks.
Strategic Imports
ENGINE CORE · GEARBOX · INJECTOR PUMP INTERNALS · PORTAL GEARSETS · HIGH-Q SEALS
High-precision machining stays imported until tooling and metrology mature. Ensures long-term drivetrain durability.
Source Documentation
ER-TRACKER · Cab-Over Truck Chassis Design
Complete technical design specification covering chassis architecture, station coordinates, materials, powertrain integration, suspension kinematics, electrical backbone, and localization strategy.