Auger Excavator and Dryer
LADI-Class Continuous Auger Regolith Reactor
The LADI-class continuous auger regolith reactor is a 45-kilogram geotechnical tool that simultaneously drills up to 1.5 meters into icy lunar deposits, transports cuttings upward by helical rotation, and heats the regolith to liberate water vapor in a single operation. Operating inside permanently shadowed regions at 88 K, the assembly experiences severe thermal shock when 1,500-watt heaters warm regolith past the 150 K vacuum sublimation point. Processing is complicated by abrasive, cryogenically cemented regolith wearing down drill bits, the ambient vacuum requiring sealed sleeves to prevent vapor loss, and 1/6 g gravity restricting reaction torque management during continuous excavation.
Continuous-flow auger excavator following NASA's Lunar Auger Dryer ISRU (LADI) concept that simultaneously drills into icy regolith, transports cuttings vertically, and applies heat along the auger barrel to liberate water vapor in a single integrated process.
Purpose
Provide a low-mass, continuous-flow alternative to batch ice extraction — combining excavation and thermal release of volatiles into one tool, reducing material-handling overhead and enabling steady-state water production.
Context
Used in PSR-adjacent ice mining sites alongside L3-ISR-EXC-BWE bulk excavation. Coupled to L2-ISR-ICE (heating, sublimation, condensation chain) and L2-ISR-VOL (volatile capture). Provides feedstock to L3-ISR-ICE-COND for vapor recovery.
Principles
- ▸Auger geometry transports cuttings upward by helical rotation — pitch and flight angle set transport rate
- ▸Sleeve forms temporary sealed space around auger to capture sublimated vapor as regolith heats
- ▸Heating rod inside or alongside auger sleeve raises regolith above water-ice sublimation temperature (~150 K at vacuum)
- ▸Pilot-scale tests recover >80% of water from icy regolith samples; rate ~0.75 mL/min at 6 wt% initial water (ScienceDirect Acta Astronautica 2022)
- ▸Vapor pressure + diffusion + convection move water vapor without pumps — relies on temperature/pressure gradient
- ▸Auger reaction torque managed by anchored frame or paired counter-rotating augers
Typical implementations
- ▸NASA Lunar Auger Dryer ISRU (LADI) — NASA JSC, technically validated to TRL 4 before 2023 budget cancellation (NTRS 20230013485)
- ▸Honeybee Robotics PlanetVac (alternative pneumatic concept)
- ▸ScienceDirect Acta Astronautica 2022 (Lin et al.) — pilot-scale drilling thermal extraction unit, 80% water recovery
- ▸Auger-based water extraction concepts (ScienceDirect Icarus 2021, Acta Astronautica 2024)
- ▸Microwave-augmented auger heating (PMC 12308065, 2025) — massive water production from cryogenic icy regolith
Lunar considerations
- ▸Operates in PSR ultra-cold environment (~88 K) — must withstand thermal shock when heating elements engage
- ▸Auger drill bit wears against frozen/cemented regolith — replaceable bit cartridges via L1-MNT
- ▸Sleeve sealing against vacuum-stable regolith requires careful interface design
- ▸Reaction torque in 1/6 g manageable with anchoring spike or paired auger configuration
- ▸Continuous-flow vs. batch trade-off: continuous reduces material handling but complicates sealing/heating
- ▸Long-life heater elements (Inconel or PBN-clad) for repeated thermal cycling
Specifications
Functional
| primary function | Continuous excavation + heating to liberate water from icy regolith |
| inputs | Drive commands from L3-ISR-CTRL-PROC, Power from L1-PDM (heating + drilling), Mechanical anchorage to L1-STR foundation, Vapor capture interface to L3-ISR-ICE-COND |
| outputs | Water vapor stream (~0.75 mL/min/wt% per pilot test) to L3-ISR-ICE-COND, Dry regolith tailings, Bit wear, heater current, vapor flow telemetry |
| auger diameter m | 0.15 |
| auger length m | 2.0 |
| depth capability m | 1.5 |
| rotation speed rpm | 60 |
| water recovery efficiency percent | 80 |
| water production kg per day | 5 |
| heating power w | 1500 |
| drilling power w | 200 |
| operating temperature c heater | 250 |
Physical
| mass kg | 45 |
| dimensions | 2.4 m height × 0.4 m diameter (when extended) |
| materials | Inconel 625 auger flighting (heat-resistant, abrasion-tolerant), Tungsten carbide drill bit teeth, Stainless 316L sleeve, PBN (pyrolytic boron nitride) heating element, Ceramic thermal insulation between heater and auger drive, Brushed motor with sealed gearbox |
| operating temperature c | -180, 250 |
| vacuum compatibility | True |
| ultimate load g | 6 |
Operational
| power consumption w | 1700 |
| thermal range c | -180, 250 |
| lifetime hours | 2000 |
| mtbf hours | 1500 |
| bit replacement interval hours | 500 |
Interfaces
Provides
- Water vapor stream from sublimation
- Vapor flow, heater current, drill telemetry
Requires
- 1.7 kW continuous (heater dominates)
- Drilling actuator + axial feed
- Anchorage for reaction torque
- Cold-side rejection for heater electronics
Cite this entry
Lunar Ark Codex. "Auger Excavator and Dryer" (L3-ISR-EXC-AUG). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-ISR-EXC-AUG
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.