Mech Armor File: MPU "Buyer"
File Level: Top Secret / ALPHA-4
Last Updated: 2030, MCD Technical Evaluation Department
File Number: MPU-010
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Part One: Basic Information
Item Contents Mech Name MPU "Buyer"
Model MPU-010 "Field Supply Demonstrator"
Category Logistics Support Mech / Mobile Supply Platform
Affiliation 4th Logistics Support Brigade (Former) of the Russian Federation Army
Design Time 2018 (Concept Design) - 2019 (Prototype Completed)
Service Time 2020 - End of the Calamity War
Final Status Stored at the "Iron Coffin" base in the Ural Mountains after the war
Designer 9th Logistics Equipment Research Institute of the United Machine Building Bureau (UMMB)
Origin of Naming
The name "Buyer" is taken from the tenth demon among the seventy-two demons of Solomon, depicted with a lion's head and five goat's legs surrounding its body, renowned for its mastery of herbalism and ability to heal all diseases. The design team named it after the demon, symbolizing its core mission of "providing supplies and repairs to mechs on the battlefield, like a healer healing the wounded." This naming continues the tradition of the "Seventy-two Demons" series, forming a complete demon lineage with other mechs in the same series.
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Part Two: Development History
Background
In the late 2010s, the MPU series began large-scale deployment, but its operational sustainability issues gradually surfaced. Traditional logistical support methods (truck transport, fixed bases) could not keep up with the mobility of mech units and were extremely vulnerable to enemy fire. On the battlefield, MPUs were frequently forced to withdraw from combat due to minor malfunctions or energy depletion, resulting in wasted combat power.
Against this backdrop, UMMB initiated research on a "field-accompanying supply platform," aiming to develop a new type of support mech capable of "following mech units forward, providing real-time supplies and repairs."
Core Design Concept
The design of "Buyer" revolves around the "Nest System," with its core concept being:
"Ensuring every mech can fight to the last moment."
Specifically, this manifests in:
1. Accompanying Support: Possessing mobility comparable to combat MPUs, capable of advancing alongside troops.
2. Modular Supply: Carrying various sizes of spare parts, ammunition, and energy modules.
3. Field Repair Capability: Equipped with robotic arms and repair equipment, enabling rapid battlefield repairs.
4. Energy Transfer: Capable of providing emergency energy replenishment to other MPUs.
Relationship with Florence
Buyer's "Nest System" is a crucial technological prototype for Florence's "Vest System":
· Modular Concept: The Nest System was the first to validate the feasibility of "externalizing functional modules."
· Interface Technology: The Nest System's energy/data interface design directly influenced the Vest System's universal interface.
· Structural Layout: Buyer's backpack-style cargo container structure became the prototype of the Vest System.
· Differences: The Nest system focuses on resupply and maintenance, while the Vest system expands to full combat capabilities.
Technical Challenges
The development of the "Nest system" faced several technical challenges:
· Lightweight storage: How to carry sufficient supplies within a limited space
· Rapid docking: Compatibility with energy/data interfaces of different MPU models
· Field environment adaptability: Resupply operations under adverse weather conditions and enemy fire
· Self-defense capability: As a logistics unit, it still needs to possess basic defensive capabilities.
Milestones
· February 2018: Concept design initiated
· July 2018: Modular storage unit prototype testing
· November 2018: Universal resupply interface design completed
· March 2019: Buyer mainframe construction begins
· August 2019: First live-fire resupply test successful
· November 2019: Compatibility testing with multiple MPU models completed
· February 2020: Officially deployed, designated MPU-010 ---
Part Three: Technical Specifications
Basic Dimensions and Weight
Item Value Remarks
Overall Height 17.5 meters (including head antenna)
Body Height 16.2 meters (excluding antenna)
Shoulder Width 8.2 meters (Standard configuration)
Overall Width (including container) 14.6 meters (Maximum Width)
Body Weight 44.8 tons (Unloaded)
Full Load Weight 86.3 tons (including supplies)
Maximum Load Capacity 95 tons (Extreme Overload)
Power System
Main Engine
· Model: UMMB "Giant's Heart" Mark II-H Enhanced Charged Particle Fusion Reactor
· Output Power: 5,800 kW (rated) / 8,200 kW (peak)
· Special Design: 40% power redundancy reserved for powering other units
· Fuel: High-concentration charged particle solution
· Endurance:
· Regular Cruise: 48 hours
· Full Power Output (Replenishment Mode): 24 hours
· Emergency Power Supply Mode: Can continuously power friendly aircraft for 6 hours (own mobility limited)
Auxiliary Power
· Model: High-capacity energy storage unit × 4
· Function: Stores excess energy for emergency replenishment
· Energy Storage Capacity: Equivalent to 2 MPUs at full charge
Transmission System
· Joint Drive: Reinforced electro-hydraulic servo system × 36 locations
· Reaction Speed: Command to action delay ≤ 0.2 seconds
· Load Capacity: Maintains mobility comparable to a combat MPU even under full load
Airframe Structure
· Frame Material: Reinforced titanium alloy, key parts employ a double structure
· Armor Material:
· Main Body: Medium-thickness composite armor, equivalent thickness 150-200mm
· Cargo Container Area: Lightweight protective layer, primarily protecting replenishment supplies
· Cockpit: Spherical composite armored compartment, equivalent thickness 300mm
· Special Design: The container can be jettisoned entirely in an emergency, enhancing the vehicle's mobility.
Operating System
* Main Control Computer: UMMB "Logic-2L" dedicated logistics control system
* Auxiliary Processor: Dedicated computer for supply management
* Driving Modes:
* Main Mode: Fully manual control
* Supply Mode: Semi-automatic docking and energy transfer
* Emergency Mode: Voice command backup
* Driver Seats: 1 person (driver) + 1 optional maintenance technician
* Special Training Requirements: Drivers must complete "Field Supply Course" and "Emergency Maintenance Training"
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Part Four: Nest System Core Technology
System Overview
The official name of the "Nest System" is "Field Accompanying Supply and Maintenance Integration System," consisting of five subsystems:
1. Storage Unit Array: Carries various supply materials
2. Energy Transfer System: Replenishes energy for other MPUs
3. Maintenance Operation Unit: Robotic arm and tool set
4. Spare Parts Management System: Automated Inventory and Scheduling
5. Data Link and Coordination Terminal: Networked with the Military Logistics System
Storage Unit Array
· Structure: Main cargo container at the back + auxiliary cargo containers on both sides at the waist + leg storage compartments
· Total Volume: Approximately 180 cubic meters
· Storage Configuration (Standard Full Load):
· Energy Modules: 12 standard energy units (each powering one MPU for 4 hours of operation)
· Ammunition: 48 ammunition boxes of various calibers
· Spare Parts: 32 types of joint actuators, armor plates, sensor components, etc.
· Maintenance Consumables: 24 boxes of welding materials, lubricants, coolant, etc.
· First Aid Supplies: 12 driver medical kits
· Intelligent Management: Each storage unit is equipped with an RFID tag; the system can conduct real-time inventory checks.
Energy Transmission System
· Transmission Method: Contact-type high-voltage DC transmission / Non-contact inductive transmission (backup)
· Transmission Power: Up to 5MW (contact type) / 1MW (Inductive)
· Compatible Interfaces:
· Standard Interface: Compatible with all "Seventy-Two Demon Gods" series MPUs
· Adapter: Can be adapted to other mech models
· Transmission Time:
· Emergency Recharge (20%→80%): 8 minutes
· Full Charge (0%→100%): 25 minutes
· Safety Protection: Overload protection, short circuit protection, automatic disconnection
Maintenance Operation Unit
· Main Robotic Arm × 2:
· Length: 8.5 meters
· Degrees of Freedom: 7 axes
· Maximum Load: 2 tons
· End Tool: Universal connector, replaceable with welding gun, cutter, wrench, etc.
· Auxiliary Robotic Arm × 2:
· Length: 4.2 meters
· Degrees of Freedom: 5 axes
· Mainly used for fixing parts and assisting operations
· Spare Parts Storage: Commonly used parts storage box is located at the base of the robotic arm
· Operational Capabilities:
· Replace damaged joint actuators (average time 20 minutes)
· Weld armor cracks (average time 5 minutes/meter)
· Replace sensor arrays (average time 15 minutes)
· Perform emergency structural reinforcement
Spare Parts Management System
· Automatic Inventory: Automatically scans inventory hourly and generates supply requirement reports
· Intelligent Scheduling: Predicts supply needs based on troop operational plans
· Tactical Advice: Can suggest resupply times and locations to commanders
· Data Link: Synchronizes inventory information with rear bases to prepare for the next wave of resupply in advance
Nest System Operating Modes
Mode A: Follow-up
· Purpose: Follows the movement of combat troops
· Status: Container closed, robotic arm retracted
· Mobility: Comparable to combat MPUs
Mode B: Point-to-Point Resupply
· Purpose: Centralized resupply for multiple mechs in a safe area
· Status: Partially deploys container, initiates energy transmission
Supply Rate: Can simultaneously charge 2 mechs + repair 1 mech
Mode C: Field Repair
· Purpose: Emergency repair of damaged mechs at the front lines
· Status: Mechanical arm deployed, repair tools activated
· Protective Stance: Armor adjusted to optimal protective angle
Mode D: Emergency Power Supply
· Purpose: Emergency transport when friendly mechs run out of power
· Status: Buyer approaches a friendly mech and directly supplies power via cable
· Limitation: Buyer's own mobility speed is reduced to 30% during power supply
Mode E: Container Jetoff
· Purpose: Improve mobility or prevent supply destruction in emergencies
· Operation: Jetoff all containers with one click
· Post-Jetoff Status: Weight reduced by 45 tons, mobility increased by 60%
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Part Five: Armament System
As a logistics support mech, Buyer's armament is primarily defensive.
Fixed Armaments
1. Head-mounted Close-In Weapon System (CIWS) × 2
· Caliber: 20mm
· Ammunition: 600 rounds
· Purpose: Close-range defense, interception of light targets
2. Shoulder-mounted Grenade Launchers × 4
· Caliber: 40mm
· Ammunition: 12 rounds per launcher
· Ammunition Type: Smoke grenades, illumination grenades, tear gas grenades, high-explosive grenades (mixed load)
· Purpose: Area control, covering retreats
3. Wrist-mounted Combat Claws × 2
· Type: Hydraulically driven three-fingered claw
· Lifting Capacity: Can lift 10 tons
· Combat Purpose: Close-range combat, can also be used to secure units under repair
4. Chest-mounted Smoke Launchers × 8
· Smoke Type: Multi-band concealing smoke + chaff
· Duration: 60 seconds of concealment per shot
· Purpose: To cover resupply operations or retreats
Handheld Weapons (Optional)
1. "Guardian" Defensive Rifle
· Caliber: 60mm electromagnetic acceleration
· Effective Range: 2 km
· Features: Medium power, sustained fire
· Ammunition: 120 rounds
2. "Iron Shield" Defensive Shield
· Dimensions: 6m high × 3.5m wide
· Material: Composite ceramic + reactive armor
· Protection Capability: Withstands direct hits from 120mm artillery
· Special Design: Shield has built-in resupply lines, allowing for resupply operations while providing protection.
Special Equipment
· Battlefield Recorder: Records the entire resupply operation process for post-battle analysis
· IFF System: Enhanced version, preventing friendly fire during melee
· Automatic External Decontamination System: Removes nuclear, biological, and chemical contamination
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Part Six: Tactical Positioning and Application Theory
Designing Tactical Positioning
Buyer's original tactical role was a "mobile supply depot":
1. Accompanying support: Providing immediate resupply to assault troops.
2. Field repair: Rescuing damaged mechs at the front lines and returning them to the battlefield.
3. Energy relay: Providing long-range energy support to mechs deep behind enemy lines.
4. Supply transfer: Transporting supplies between field depots and the front lines.
Ideal Application Scenario
Example of the "ideal combat flow" proposed by the designers:
Scenario: Mechanized assault troops in continuous combat for 48 hours.
1. 0-6 hours: Break through the enemy's front line, accompany and follow, maintain distance, and the assault troops advance rapidly.
2. 6-7 hours: Initial resupply, deployed in the occupied area, resupplying 20 mechs with energy and ammunition, and the assault troops organize defenses on the spot.
3. 7-18 hours: Continue the assault, follow up to the next area, and advance.
4. 18-20 hours: Field repair, replacing joints for 3 damaged mechs, and other units continue combat.
5. 20-30 hours: Night operations, small-scale resupply in batches to maintain troop combat effectiveness, and staggered operations.
30-48 hours: Continuous support, mobile resupply as needed, and rotating resupply for each unit.
Weaknesses and Limitations
1. Weak defense: Although it has medium armor, it is still not suitable for direct combat.
2. Vulnerable during resupply: Loss of mobility during deployment, making it an easy target.
3. Limited resources: A full load can only support about 20 mechs for a complete resupply at one time.
4. Dependence on the rear: It also needs to return to base regularly to replenish supplies.
5. Complex operation: Pilots need to master multiple skills simultaneously, including driving, resupply, and maintenance.
Relationship with the "Seventy-Two Demon Gods" series
Buyer holds a unique position in the Demon God series:
· Logistics pioneer: First to systematize and mechize "field resupply"
· Technology verification platform: Lays the modular foundation for Florence's armor system
· Comparison with other units in the series:
· Compared to Barbatos (melee): No offensive capability but indispensable
Compared to Mabas (anti-stealth): Single function but significant value
Compared to Florence (versatile): Specializes in resupply, more efficient
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Part Seven: Technical Assessment and Historical Positioning
Advantages Assessment
1. Significantly improves troop endurance: Extends mech combat time by 2-3 times
2. Reduces casualty rate: Timely repairs prevent minor malfunctions from escalating
3. Tactical flexibility: Resupply points can be adjusted according to needs
4. Strong compatibility: Can provide resupply for various mech models
5. Relatively simple operation (compared to combat mechs)
Disadvantages Assessment
1. High cost: Equivalent to 1.5 conventional MPUs
2. No combat capability of its own: Requires additional troop protection
3. Time-consuming resupply operations: Large-scale resupply requires a long downtime
4. Limited resources: Cannot meet large-scale needs
Large-scale, long-duration combat requirements
Cost Analysis (in 2019 currency values)
Item | Cost (million rubles) | Percentage
Buyer Unit | 142 | 38%
Nest System | 156 | 42%
Training System | 32 | 9%
Initial Supply | 42 | 11%
Total | 372 | 100%
Comparison: The cost of 1.5 conventional MPUs during the same period was approximately 300 million rubles.
Technological Legacy
Buyer's Nest system had a profound impact on subsequent models:
1. Armor System:
· Modular storage unit design directly inspired Florence's Armor system.
· Universal interface technology became the foundation of the Armor system.
2. Field Resupply Concept:
· Later developed into a dedicated resupply MPU, "Single Calabi".
· Civilized for disaster relief and material transport.
3. Energy Transfer Technology:
· Applied to the auxiliary power supply system of the SIN ship.
· Provided the technological foundation for establishing a "battlefield energy network".
Historical Position
Buyer's work was groundbreaking in the history of MPU development:
Technical Aspects:
· First-ever dedicated field resupply platform for mechs.
· Verified modular storage and rapid docking technologies.
· Laid the foundation for subsequent multi-functional modular systems.
Tactical Aspects:
· Changed the concept of operational continuity for mech units.
· Made "uninterrupted assault" possible.
This proves that logistics units also need to be mechanized.
Historical Evaluation:
"Without Buyer, our mech units could only fight for one day; with Buyer, we could fight for a week. It's not the star of the battlefield, but it's the reason why stars can continue to shine."
—Memoirs of a retired commander of the 4th Logistics Support Brigade, 2027
"The Nest System is just like its name—a warm harbor. When you're exhausted and battered, seeing Buyer slowly approaching, you know: you can still fight."
—Former MPU Pilots Association Publication, 2029
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Part VIII: Appendix
Technical Specifications Summary
Item Values Overall Height 17.5 meters Base Weight 44.8 tons Fully Loaded Weight 86.3 tons Output Power 8,200kW (Peak) Maximum Running Speed (Unloaded) 82 km/h Maximum Running Speed (Fully Loaded) 65 km/h Resupply Capability (Standard Full Load) Capable of providing a complete resupply for 20 MPUs.
Maintenance Capability: Can perform battlefield repairs up to level 3.
Crew: 1 person (optional 1 technician).
Known Operational Record Summary:
Data Loss
Modification Models:
* Buyer-M: Adds a medical module, accommodating 4 wounded soldiers.
* Buyer-C: Command version, equipped with communication relay equipment.
* Buyer-E: Engineering version, enhanced maintenance capabilities, used for permanent facility construction.
Design Team Notes:
"When designing the Buyer, we were often asked: 'Why use an expensive mech for logistics? Why not just use trucks for transport?'"
Then we took the questioner to the training field, showed them a convoy of trucks immobilized under enemy fire, and then showed them the Buyer, capable of quickly traversing complex terrain and delivering energy to the front lines amidst artillery fire.
The question was no longer a question. "Buyer proved one thing: in this era where mechs dominate the battlefield, logistics must also be mech-ized. Only mechs can keep pace with the mechs."
—The entire 9th Logistics Equipment Research Institute of UMMB, 2020
Storage Status
Buyer is currently stored in Storage Area 2 of the "Iron Coffin" base. According to maintenance personnel, its core components of the Nest System have been removed and stored separately, and the machine itself is in good condition.
In 2027, there was a proposal to convert it into a civilian disaster relief machine, but this was shelved due to cost issues. Currently, its technological legacy has been integrated into the Magic Management Bureau's "Mobile Supply Station" project.
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Endnote of the File
MCD Technical Evaluation Department Note: Buyer's existence reminds us of a simple fact: the most magnificent attacks require the most basic logistical support. In the Demon God series, it may be the most inconspicuous member, but without it, the legends of other Demon Gods might be much shorter.
Its "Nest System" was not only the technological prototype of the Florence Vest System, but also the source of an idea—modularizing and externalizing complex functions, allowing the same platform to adapt to different needs. This idea continues to influence the development direction of MCD's equipment.
Archived by: Historical Archives Section, MCD Technical Evaluation Department
Reviewed by: Technical Review Committee of the Rebel Force
Archived Date: September 14, 2030
End of Archive