Mars Transit Vehicle Design Document
HERMES-class Interplanetary Crew Transport
# Mars Transit Vehicle Design Document
HERMES-class Interplanetary Crew Transport
40+ Crew Capacity | 6-Month Transit Duration | Fully Regenerative Life Support
π Executive Summary
| Parameter | Specification |
|---|---|
| **Designation** | MTV-1 "HERMES" (Human Exploration & Research Mars Expedition Ship) |
| **Crew Capacity** | 44 nominal / 48 maximum |
| **Transit Duration** | 180 days (Hohmann) / 140 days (fast conjunction) |
| **Habitable Volume** | 2,850 mΒ³ (pressurized) / 1,920 mΒ³ (habitable) |
| **Total Dry Mass** | 285 metric tons |
| **Fully Loaded Mass** | 380 metric tons (without propulsion) |
| **Life Support Closure** | 98.2% water / 95.5% oxygen |
| **Artificial Gravity** | 0.38g (Mars-equivalent) via rotation |
| **Power Generation** | 450 kWe (nuclear electric) |
| **Radiation Protection** | β€500 mSv total mission dose |
| **Assembly Orbit** | 400 km LEO, assembled via 4Γ ARES-VII launches |
1. Mission Requirements Derivation
1.1 Crew Requirements Analysis
CREW COMPLEMENT: 44 PERSONNEL
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
COMMAND & OPERATIONS (8)
βββ Mission Commander (1)
βββ Pilot/Navigator (2)
βββ Flight Engineers (3)
βββ Communications/IT Specialists (2)
SCIENCE & EXPLORATION (14)
βββ Geologists/Planetary Scientists (4)
βββ Astrobiologists (3)
βββ Atmospheric Scientists (2)
βββ Robotics Engineers (3)
βββ Field Research Coordinators (2)
MEDICAL & LIFE SCIENCES (8)
βββ Flight Surgeons/Physicians (3)
βββ Nurses/Paramedics (2)
βββ Psychologist/Behavioral Health (1)
βββ Pharmacist/Biochemist (1)
βββ Exercise Physiologist (1)
ENGINEERING & MAINTENANCE (10)
βββ Mechanical Engineers (3)
βββ Electrical Engineers (2)
βββ Life Support Technicians (2)
βββ EVA Specialists (2)
βββ Manufacturing/Fabrication Tech (1)
COLONY OPERATIONS (4)
βββ Habitat Systems Manager (1)
βββ Agriculture/ISRU Specialist (2)
βββ Logistics Coordinator (1)
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
DEMOGRAPHIC REQUIREMENTS:
β’ Age range: 30-55 years
β’ Gender balance: 45-55% target
β’ Cross-training: Each crew member qualified in 2+ secondary roles
β’ Watch rotation: 3 shifts Γ 8 hours, 4 duty sections1.2 Life Support Requirements (Per Person Per Day)
| Resource | Consumption | Unit | 44 Crew/Day | 180-Day Mission |
|---|---|---|---|---|
| Oxygen (metabolic) | 0.84 | kg | 37.0 kg | 6,652 kg |
| Potable Water | 2.5 | L | 110 L | 19,800 L |
| Hygiene Water | 6.0 | L | 264 L | 47,520 L |
| Food (dry mass) | 0.62 | kg | 27.3 kg | 4,910 kg |
| Food (with water) | 1.8 | kg | 79.2 kg | 14,256 kg |
| COβ Production | 1.0 | kg | 44.0 kg | 7,920 kg |
| Urine | 1.5 | L | 66 L | 11,880 L |
| Fecal Matter | 0.12 | kg | 5.3 kg | 950 kg |
| Sweat/Respiration | 2.3 | L | 101 L | 18,216 L |
| Metabolic Heat | 120 | W | 5.3 kW | Continuous |
1.3 Key Design Drivers
CRITICAL DESIGN REQUIREMENTS
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LIFE SUPPORT
βββ 98%+ water recovery (minimize resupply mass)
βββ 95%+ oxygen recovery from COβ
βββ 180+ day continuous operation without resupply
βββ Graceful degradation (30-day open-loop backup)
βββ Fire detection/suppression throughout
RADIATION PROTECTION
βββ Storm shelter for 44 crew (SPE protection)
βββ GCR shielding to limit dose <500 mSv
βββ Real-time dosimetry for all crew
βββ Medical countermeasures available
CREW HEALTH
βββ Artificial gravity (0.3-0.5g range)
βββ Exercise facilities (2-hour daily requirement)
βββ Private quarters for psychological health
βββ Medical/surgical capability
βββ Nutrition variety (200+ menu items)
SAFETY & REDUNDANCY
βββ Dual-fault tolerance on critical systems
βββ Safe haven capability (14 days in emergency)
βββ Abort capability through Day 30
βββ Fire isolation/compartmentalization
βββ Debris shielding (1 cm aluminum equivalent)
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ2. Vehicle Architecture
2.1 Configuration Trade Study
| Configuration | Pros | Cons | Score |
|---|---|---|---|
| **Monolithic** | Simple integration, rigid | Too large for single launch, no gravity | 2/5 |
| **Linear Modular** | Launch flexibility | No artificial gravity, long traversal | 3/5 |
| **Rotating Truss** | Artificial gravity, modular | Complex mechanisms, power transfer | 4/5 |
| **Tethered Rotation** | High radius, simple | Stability issues, tether risk | 3/5 |
| **Dual-Habitat Counter-Rotation** β | Gravity, redundancy, balanced | Assembly complexity | 5/5 |
2.2 Selected Architecture: Counter-Rotating Habitat Configuration
2.3 Module Breakdown Structure
HERMES MTV - MODULE BREAKDOWN
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MTV-1 HERMES
βββ CENTRAL HUB MODULE (CHM)
β βββ Docking Adapter (forward)
β βββ Zero-G Laboratory
β βββ Cupola/Observation
β βββ Storm Shelter Core
β βββ Rotation Bearings (Γ2)
β βββ EVA Airlock
β
βββ HABITAT MODULE A (HM-A) - Port
β βββ Deck 1: Crew Quarters (11 cabins)
β βββ Deck 2: Common Area / Galley
β βββ Deck 3: Life Support Primary
β βββ Deck 4: Medical Bay / Gym
β
βββ HABITAT MODULE B (HM-B) - Starboard
β βββ Deck 1: Crew Quarters (11 cabins)
β βββ Deck 2: Science Labs / Workshop
β βββ Deck 3: Life Support Backup
β βββ Deck 4: Storage / Storm Shelter Ext.
β
βββ TRUSS ASSEMBLY
β βββ Port Truss Segment (Γ3)
β βββ Starboard Truss Segment (Γ3)
β βββ Power/Data Cabling
β βββ Fluid Transfer Lines
β
βββ POWER & THERMAL MODULE (PTM)
β βββ Kilopower Reactors (Γ4)
β βββ Heat Rejection Radiators
β βββ Power Management & Distribution
β βββ Thermal Control System
β
βββ PROPULSION INTERFACE ADAPTER (PIA)
βββ Structural Interface Ring
βββ Propellant Feed Connections
βββ Avionics Integration
βββ Backup Docking Port
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ3. Artificial Gravity System
3.1 Rotation Parameters
| Parameter | Value | Rationale |
|---|---|---|
| **Target Gravity** | 0.38g (3.73 m/sΒ²) | Mars surface equivalent - pre-adaptation |
| **Rotation Radius** | 56 m | Balance between gravity & Coriolis effects |
| **Rotation Rate** | 2.1 RPM | Below comfort threshold of 4 RPM |
| **Tangential Velocity** | 12.3 m/s | Manageable for crew movement |
| **Gravity Gradient** | 0.007 g/m | <2% head-to-foot differential |
| **Coriolis Effect** | 0.26 m/sΒ² | Acceptable with crew adaptation |
3.2 Counter-Rotation System
COUNTER-ROTATION MECHANISM
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Zero Net Angular Momentum Design
HAB-A HUB HAB-B
βββ 2.1 RPM β 2.1 RPM βββΊ
(CCW) β (CW)
β² β β±
β² βββββββββββββββ΄βββββββββββββ β±
β² β β β±
β² β ROTATION BEARING β β±
β² β ASSEMBLY (RBA) β β±
β²β ββ±
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
BEARING SPECIFICATIONS:
βββ Type: Magnetic bearing with mechanical backup
βββ Torque capacity: 50,000 NΒ·m continuous
βββ Power transfer: Slip rings + wireless (backup)
βββ Data transfer: Fiber optic rotary joint
βββ Fluid transfer: Rotary union (8 channels)
βββ Design life: 20,000 hours continuous rotation
βββ Maintenance: Replaceable bearing cartridges
SPIN-UP/SPIN-DOWN:
βββ Electric motors: 4Γ 25 kW brushless DC
βββ Spin-up time: 45 minutes (0 to 2.1 RPM)
βββ Emergency stop: <10 minutes
βββ Power consumption: 8 kW steady-state
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ3.3 Crew Transition Between Gravity Zones
4. Environmental Control & Life Support System (ECLSS)
4.1 ECLSS Architecture Overview
4.2 Atmosphere Management System
4.2.1 Atmosphere Composition
| Parameter | Nominal | Range | ISS Comparison |
|---|---|---|---|
| Total Pressure | 101.3 kPa | 97-103 kPa | 101.3 kPa |
| Oβ Partial Pressure | 21.3 kPa | 19.5-23.5 kPa | 21.3 kPa |
| COβ Partial Pressure | 0.4 kPa | <0.7 kPa | 0.3-0.5 kPa |
| Nβ Partial Pressure | 79.6 kPa | 78-81 kPa | 79.6 kPa |
| Temperature | 22Β°C | 18-26Β°C | 22Β°C |
| Relative Humidity | 45% | 30-60% | 40-60% |
| Air Velocity | 0.1-0.2 m/s | 0.05-0.4 m/s | 0.1-0.2 m/s |
4.2.2 Carbon Dioxide Removal & Reduction
COβ PROCESSING SYSTEM - FOUR-BED MOLECULAR SIEVE
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
CARBON DIOXIDE REMOVAL ASSEMBLY (CDRA)
βββ Technology: 4-bed molecular sieve (zeolite 5A)
βββ Capacity: 2.2 kg COβ/hour (53 kg/day max)
βββ Crew supported: 50 (with margin)
βββ Power consumption: 1.2 kW
βββ Cycle time: 144 minutes (6 min half-cycles)
βββ Mass: 280 kg
βββ Volume: 0.8 mΒ³
βββ Redundancy: 2Γ units (HAB-A and HAB-B)
CYCLE OPERATION:
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
β BED 1 BED 2 BED 3 BED 4 β
β (ADSORB) (DESORB) (ADSORB) (DESORB) β
β β β β β β
β β Cabin β To β Cabin β To β
β β Air In β Sabatier β Air In β Sabatier β
β βΌ β² βΌ β² β
β βββββ Heat βββββ βββββ Heat βββββ β
β β Z β βββββ β Z β β Z β βββββ β Z β β
β β E β β E β β E β β E β β
β β O β β O β β O β β O β β
β β L β β L β β L β β L β β
β β I β Cool β I β β I β Cool β I β β
β β T β βββββ β T β β T β βββββ β T β β
β β E β β E β β E β β E β β
β βββββ βββββ βββββ βββββ β
β β β β β β
β βΌ β βΌ β β
β Clean β Clean β β
β Air Out β Air Out β β
β βΌ βΌ β
β ββββββββββββββββββββββββββββββββββββ β
β β SABATIER REACTOR β β
β β COβ + 4Hβ β CHβ + 2HβO β β
β β (Nickel catalyst @ 400Β°C) β β
β ββββββββββββββββββββββββββββββββββββ β
β β β β
β βΌ βΌ β
β CHβ HβO β
β (vented) (to water system) β
βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
SABATIER REACTOR SPECIFICATIONS:
βββ COβ processing rate: 44 kg/day
βββ Hβ consumption: 8 kg/day (from OGS)
βββ HβO production: 36 kg/day
βββ CHβ production: 16 kg/day (vented or stored)
βββ Operating temperature: 400Β°C
βββ Power consumption: 0.8 kW
βββ COβ conversion efficiency: 99.5%
βββ ALTERNATIVE: Bosch reactor (solid carbon, no CHβ vent) - backup
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