IX-Breath is a rescue-biased regenerative portable life support system (PLSS) architecture study for astronaut survival after delayed ingress, separation from a station/habitat/vehicle, or other contingency conditions where ordinary backup duration may be insufficient.
This repository does not present IX-Breath as flight-qualified hardware.
It presents IX-Breath as a bounded, reviewable engineering architecture built to answer one serious question:
Can a backpack-class life-support system materially extend astronaut survivability by integrating closed-loop breathing support, layered oxygen continuity, hardened electrical continuity, explicit fault isolation, and sustainment-readiness logic into one coherent rescue-first system?
The repo’s answer is:
- yes, analytically, for a 24-hour defended case
- possibly, under bounded favorable assumptions, for 36–48 hour stretch cases
- not yet seriously enough for a 72-hour baseline claim
That distinction is deliberate.
Status: Architecture study
Maturity posture: Reviewable systems-engineering concept, not validated flight hardware
License: Apache-2.0
This repository is written to be taken seriously by technical reviewers. That means:
- claims are bounded
- constraints are explicit
- rejected ideas are documented
- failure logic is first-class
- validation requirements are defined before any summary language is allowed to oversell the concept
IX-Breath is a backpack-class concept built around five linked ideas:
-
Closed-loop breathing support
A recirculating gas loop with CO2 control, humidity handling, circulation continuity, and oxygen make-up. -
Layered oxygen continuity
Primary stored oxygen, an isolated emergency oxygen reserve, and a bounded regenerative oxygen extension path based on qualified water and gated electrolysis. -
Hardened electrical continuity
A protected power spine with battery-first architecture, supercapacitor ride-through, source isolation, precharge, bus segmentation, safe-dump behavior, and aggressive load shedding. -
Thermal and resource honesty
Oxygen regeneration is only credited when water, power, thermal margin, and control confidence all support it at the same time. -
Sustainment as a safety function
The repo treats readiness, calibration evidence, life-limited parts, and blocker visibility as real survivability architecture, not admin overhead.
IX-Breath is not:
- a claim of flight qualification
- a replacement claim for NASA or commercial EVA suit programs
- a proof that multi-day backpack survival has been demonstrated
- an excuse for “infinite oxygen” or “infinite power” language
- an exotic-energy project
- a stealth, weapon, or defense concept
- a mashup that blindly imports earlier IX-* repo claims
This repo explicitly rejects:
- Element 115 dependence
- zero-point / vacuum-energy claims
- ambient RF as primary life-support power
- triboelectric / piezoelectric primary power claims
- perpetual-motion framing
- vague field effects used as system justification
Only engineering patterns that survived the donor-feature filter were retained.
Publicly available EVA and PLSS materials make two things clear:
- contingency duration matters
- backpack volume, mass, center of gravity, and thickness matter just as much
IX-Breath exists in that tension.
The design goal is not “make a magical forever backpack.”
The design goal is make a more survivable rescue-biased backpack without lying about physics, packaging, or failure behavior.
At the current repository maturity level, the following are the correct conclusions:
A 24-hour defended survival target is analytically plausible in a dark/eclipsed case without solar credit and without depending on PEM regeneration.
A 36-hour stretch case is analytically plausible only with:
- strong rescue-lean load shedding
- modest accepted solar in mixed-light conditions
- bounded resource gating
- disciplined system posture
A 48-hour favorable sunlit stretch case is analytically plausible only with:
- low activity
- favorable lighting
- useful accepted solar offset
- meaningful but bounded regeneration credit
- preserved thermal margin
A 72-hour case does not close seriously enough to advertise as a baseline repo claim.
That is the honest answer, and it is intentional.
IX-Breath is constrained to remain backpack-class.
- Height: 25 inches
- Width: 20 inches
- Thickness: 10.5 inches
- Dry mass band: 74–108 lb
- Working midpoint: 89 lb
- Serviced mass band: 78–114 lb
- Working serviced midpoint: 95 lb
Those are architecture-level model numbers, not measured hardware values.
The repo treats thickness and center-of-gravity discipline as first-order constraints.
If later features blow up thickness or shift too much mass outward, the architecture has failed its own rules.
IX-Breath is organized as the following system stack:
- S0 — Pressure Garment Interface
- S1 — Life-Support Core
- S2 — Oxygen Storage and Delivery
- S3 — Regenerative Extension
- S4 — Water Recovery and Conditioning
- S5 — Thermal Survivability Layer
- S6 — Power Continuity Spine
- S7 — Supervisory Control / FDIR / Crew Interface
- S8 — Structural Survivability Shell
- S9 — Sustainment and Readiness Layer
The architecture is intentionally layered so that survivability does not depend on one “hero subsystem.”
IX-Breath uses six bounded top-level states:
- Nominal
- Conserve
- Rescue
- Critical
- Safe-Hold
- Service
The pack is intentionally biased toward conservative, explicit, latched behavior when confidence drops.
Key safety behaviors include:
- reserve oxygen isolation from routine depletion
- watchdog authority over unsafe supervisory behavior
- confidence-aware state freedom
- explicit denial of regeneration when affordability is not proven
- anti-thrash transition logic
- safe-hold as a real protected state, not a cosmetic pause mode
One of the central rules of IX-Breath is:
Oxygen regeneration does not count unless water, power, thermal headroom, and control confidence all permit it at the same time.
That means:
- sunlight alone does not justify PEM operation
- recovered moisture alone does not justify PEM operation
- the existence of an electrolyzer alone does not justify PEM operation
- denied regeneration is treated as a valid survival decision, not a design failure
This is one of the repo’s main anti-hype guardrails.
IX-Breath was informed by earlier IX-* concept work, but only after an explicit keep/adapt/reject filter.
What survived were mainly:
- bus segmentation and fault isolation patterns
- precharge / no-backfeed / safe-dump architecture
- watchdog and bounded-state logic
- thermal zoning and compartmentalization habits
- readiness / evidence / blocker workflow patterns
- structured logging and post-event review posture
What did not survive were the unsupported mechanisms and speculative energy claims.
The donor-feature filter is a core seriousness document in this repo, not a footnote.
The core documents are arranged so a technical reviewer can move from purpose to architecture to evidence posture without digging through fluff.
docs/00_PROJECT_CHARTER.mddocs/01_MISSION_REQUIREMENTS.mddocs/02_OPERATING_ASSUMPTIONS.md
docs/03_MASTER_ARCHITECTURE.mddocs/04_DONOR_FEATURE_FILTER.mddocs/05_PACKAGING_ENVELOPE.mddocs/06_REAL_WORLD_BOM.md
docs/07_POWER_CONTINUITY_SPINE.mddocs/08_LIFE_SUPPORT_CORE.mddocs/09_THERMAL_RESOURCE_COUPLING.mddocs/10_FDIR_AND_STATE_MACHINE.md
docs/11_MODEL_BASELINE.mddocs/12_VALIDATION_AND_HAZARD_PLAN.md
docs/99_REFERENCES.md
data/ix_breath_bom.csvdata/ix_breath_power_bus_map.csvdata/ix_breath_life_support_modes.csvdata/ix_breath_resource_gating_matrix.csvdata/ix_breath_state_transition_matrix.csvdata/ix_breath_model_inputs.csvdata/ix_breath_case_results.csvdata/ix_breath_validation_matrix.csvdata/ix_breath_hazard_register.csv
At its current maturity, this repository supports:
- serious architecture review
- subsystem and system-level critique
- packaging review
- donor-feature screening transparency
- analytical closure review
- validation planning
- hazard and FMEA discussion
- future breadboard / engineering-model planning
It does not yet support:
- flight claims
- mission certification claims
- environmental qualification claims
- human-rated hardware claims
- production-readiness claims
A serious reviewer should be able to conclude the following after reading the repo:
- the problem statement is bounded
- the architecture is coherent
- the subsystem flows are explicit
- the donor influences were filtered instead of blindly inherited
- the survivability claims are limited by real resource accounting
- the design does not rely on exotic unsupported mechanisms
- the repo admits what it has not yet proven
- the next logical step would be disciplined validation, not marketing
That is the target outcome.
The strongest honest claim this repository makes right now is:
IX-Breath is a serious rescue-biased regenerative PLSS architecture study with enough systems structure, bounded modeling, and validation planning to justify deeper engineering review and disciplined bench-level investigation.
That is where the repo stops.
Anything stronger would be maturity inflation.
For a fast technical review:
docs/00_PROJECT_CHARTER.mddocs/03_MASTER_ARCHITECTURE.mddocs/04_DONOR_FEATURE_FILTER.mddocs/05_PACKAGING_ENVELOPE.mddocs/06_REAL_WORLD_BOM.mddocs/11_MODEL_BASELINE.mddocs/12_VALIDATION_AND_HAZARD_PLAN.md
For a deeper subsystem review, continue through:
docs/07_POWER_CONTINUITY_SPINE.mddocs/08_LIFE_SUPPORT_CORE.mddocs/09_THERMAL_RESOURCE_COUPLING.mddocs/10_FDIR_AND_STATE_MACHINE.md
If IX-Breath advances beyond repo phase, the next serious move is not a polished render or a marketing deck.
The next serious move is a staged validation program:
- power-spine bench rig
- gas-loop bench rig
- water/regen bench rig
- thermal/resource coupling rig
- integrated nonhuman engineering article
- fault-injection campaign
- service/readiness workflow validation
That sequence is already defined in the repo.
Bryce Lovell
Apache License 2.0.
See LICENSE and NOTICE.