Mobile Autonomous Field Station

Container-based autonomous drone spraying base — simulation-first engineering. System v0.1 space-claim model + energy model + first FEM case, all gated.

✓1. CadQuery model✓2. 29 pytest gates✓3. energy simulation✓4. FEM gmsh→CalculiX✓5. FreeCAD validation✓6. site build

Headline results (machine-written reports, build b875da4)

14,570 kg

total mass, stowed

limit 26,000 kg

0.56 x/L

centre of gravity (length fraction)

window 0.35–0.65

1235 mm

CoG height

limit 1400 mm

17 / 18 solids

model stowed / deployed

FreeCAD verdict: PASSED

180 ha/day

spray throughput (worst month)

floor 150 ha/day

0.73 kWh/ha

energy cost per hectare

0.21 L/ha

genset fuel, worst month

bound ≤ 0.5 L/ha

40.8 MPa

tank-beam stress (2g transport)

allowable 177.5 · util 0.23

0.329 mm

tank-beam deflection

allowable 3.6 mm

29 tests

gates passing

geometry · clearance · mass · interfaces · energy · FEM

The prototype — real geometry (CadQuery → Blender, build b875da4)

deployed isometric render — Deployed state — solar wings out as awnings (2 000 mm), 18 solids

stowed floor plan render — Floor plan (roof/solar hidden) — dock cell → drone bay → fluid LEFT / electrical RIGHT, service aisle between

Renders import the exact .glb exported from the gated assembly (cad/export_visual.py → blender/render_station.py, Cycles CPU) — never a separate model. More views + zone color legend: Model v0.1.

What this system is

A sea-container field station: 6 spraying drones, automated battery/tank swap dock, 120 kWh battery bank, 18 kWp deployable solar, 3 000 L water + 6-channel chemical bank — designed for zero-human field operation. The engineering pipeline is parameters-first: YAML → CadQuery geometry → automatic gates → simulation. The model rejects its own bad designs; see Changes for the defects the gates caught.

Key design finding so far

Genset is co-primary, not backup. Worst-month solar (18 kWp ≈ physical roof/wing area cap) delivers ~66 kWh/day against ~132 kWh/day campaign demand. On spray days the genset runs 7.83 h/day ≈ 0.21 L/ha (bound 0.5). Solar fully carries standby/aux days. Recorded as ADR-0002 amendment. Details: Energy.

sources: cad/exports/station_v01_report.json · simulation/energy/energy_report.json · simulation/structural/tank_beam_report.json · cad/exports/freecad-validation.json