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# Vehicle Architecture Diagrams

## Stack — Launch to Lunar Surface [DOCUMENTED]

```

                    APOLLO 11 STACK  SA-507

                    ┌──────────────────────┐

                    │  CSM-107 Columbia    │  3 crew, SPS, CM/SM

                    ├──────────────────────┤

                    │  SLA                 │  Spacecraft-LM Adapter

                    │  ┌────────────────┐  │

                    │  │ LM-5 Eagle     │  │  Descent + Ascent

                    │  └────────────────┘  │

                    ├──────────────────────┤

                    │  S-IVB (J-2)         │  TLI stage, IU on top

                    ├──────────────────────┤

                    │  S-II (5× J-2)       │

                    ├──────────────────────┤

                    │  S-IC (5× F-1)       │  7.5 Mlbf

                    └──────────────────────┘

```

## CSM Breakdown

```

CSM

├── CM (Command Module)

│   ├── Pressure vessel + heat shield (Avcoat)

│   ├── 3 couches + controls + DSKY + optics

│   ├── ECS (O2, LiOH, glycol, sublimator)

│   └── 3× Main DC buses, 2× AC, 3× batteries

└── SM (Service Module)

    ├── SPS (AJ10-137, 20.5 klbf, N2O4/Aerozine)

    ├── RCS: 4 quads ×4 jets (100 lbf, MMH/N2O4)

    ├── EPS: 3 fuel cells + cryo O2/H2

    ├── ECS radiators + high-gain S-band (4 dishes)

    └── Instrument bay (SIM — not flown on 11)

```

## LM Breakdown

```

LM

├── Ascent Stage

│   ├── APS (Bell, 3500 lbf, Aerozine/N2O4, fixed)

│   ├── RCS (16×100 lbf, 2 systems)

│   ├── Pressurized cabin + DSKY + AOT + PGNS

│   ├── AGS backup + rendezvous radar (RR)

│   └── EDS + batteries

└── Descent Stage

    ├── DPS (TRW, throttle 1050–9850 lbf, gimbaled)

    ├── Landing gear (4×) + ladder + EASEP

    ├── Landing radar (LR)

    ├── Batteries + O2/H2O + PLSS recharge

    └── Engine skirt + thermal blankets

```

## Guidance Chain [DOCUMENTED]

```

IMU (gyros/accels/CDUs) ─┐

Optics (AOT/COAS) ───────┤

Landing Radar ───────────┼─→ AGC (Luminary099) → DAP → RCS/DPS/APS gimbal

Rendezvous Radar ────────┤         ↕

Ground uplink (V35/V71) ─┘      DSKY ↔ Crew

                              ↓ telemetry

                           MSFN → MCC-H

```

## Propulsion & Control Flow

```

AGC Executive → Waitlist → Servicer (2s) → FINDCDUW → DAP → TJET → RCS jets

                ↘ PHASE TABLE (restart protection)

AGC Interpreter → powered-flight subroutines → cross-product steering → ENG ON (BURN_BABY_BURN)

AGC Throttle → THROTTLE_CONTROL_ROUTINES → DPS throttle (Servicer loop)

```

## Communications Topology

```

LM S-band steerable ─┐

LM S-band omni ──────┼─→ MSFN (26m) → MCC-H (CAPCOM/ FDO/ GUIDO)

CSM S-band high-gain ─┤

VHF CSM↔LM ───────────┘

VHF LM↔EVA (PLSS) ───→ LM relay → S-band

```

## Power & ECS Simplified

```

CSM: Cryo O2/H2 → 3 Fuel Cells → 28V DC buses A/B/C → inverters → AC

LM: AgZn batteries (4) → 28V buses → ECS: glycol + sublimator + LiOH + O2

```

All diagrams are **RECONSTRUCTED** from AOH/Saturn V Manual schematics, tagged but simplified for simulation interfaces (`src/vehicle/`).