HyFlux — Aviation LCA Decision Engine#

HyFlux is a browser-based decision-support engine for aviation decarbonisation. A TypeScript calculation core (src/engine/) computes well-to-wake life-cycle emissions, energy demand, fuel economics and removal costs for a user-defined scenario on the 2019–2050 horizon; a React single-page application renders the results as interactive emissions wedges, cost comparisons and KPI strips. The live application is deployed at hyflux-lca.pages.dev.

Relationship to CASCADE#

HyFlux is a methodology-parity project. Boeing’s CASCADE documentation [Boeing, 2026] publishes the mathematical formulation of that tool, and the HyFlux engine re-implements those formulations wherever they are disclosed, tracking coverage equation-by-equation in a coverage matrix (see Methodology Parity). HyFlux is not affiliated with Boeing, contains no Boeing proprietary data, and copies no CASCADE documentation content — every page here is HyFlux’s own documentation of its own implementation. Where a formulation is restated, it is cited to the CASCADE equation label it reproduces.

Two consequences of this arrangement are load-bearing:

  • Synthetic data. CASCADE’s route-level traffic dataset (Cirium) and its reference-aircraft range-energy tables are proprietary. HyFlux ships a transparent, first-principles synthetic dataset (Air Traffic Dataset) and injectable substitute reference tables (Aircraft — Fleet Renewal & Future Aircraft). Methodology parity may be claimed where benchmarks pass; data parity must never be claimed.

  • Documented deviations. Every simplification, substitution and open defect is registered on the methodology pages and consolidated in Methodology Parity, with the engineering decision log (DL-series) as provenance.

Parity status summary#

Condensed from the regenerated coverage matrix (docs/rst-coverage-matrix.md, DL-131/DL-132) and the 2026-08-02 gap register refresh; the full matrix and refresh table are rendered at Methodology Parity. “Standalone/shadow” means implemented and test-green but not wired into the production computeLCA path (the DL-138 integration-stage registry governs promotion).

CASCADE section

Status

Note

Payload Capacities

Exact

All 17 equations implemented and test-asserted (payload.ts, DL-132)

Fleet Size Estimation

Exact

5/5 equations + τ_avg bucket tables verbatim (DL-132); β_NEC are CASCADE’s own placeholders

Traffic Growth

Partial

Production: compound CAGR (multi-segment) + COVID factors, two-track headline (DL-022); Hermite family + region-pair form standalone (DL-137) with named traffic bases (DL-139)

Fleet Renewal

Equivalent / Partial

Curve family equation-exact (DL-028); full route-level substitution + RCTK conservation chain in shadow (DL-136)

Future Aircraft

Simplified

Full module with route-level machinery; proprietary reference tables substituted; flight tensor standalone (DL-137)

Operations

Partial

ARM/FAO/ATM additive + load-factor physics (DL-010/017); printed linear-ramp/multiplicative forms standalone (DL-137)

Electricity / Hydrogen

Exact (LH₂ del.)

LH₂ delivered CI reproduces the CASCADE closed form exactly (DL-024); low-carbon CI input + curve shapes (DL-129/161)

Jet Fuel / SAF / PtL

Simplified

Per-feedstock blend; stoichiometric PtL CI two-track (DL-024); per-carrier boundaries (DL-162)

Methane

Exact (equations) / two-track (values)

11/11 equations incl. PtG heat-recycle and vapour compounding (DL-134); published 558 / ε 1.14 vs derived 596 / 1.20636 basis two-track (DL-130)

Energy Demand

Partial

Aggregate roll-up in production; all 29 equations standalone in shadow (DL-136)

Context Metrics

Exact

6/6 equations (DL-134), Breguet-range on-page self-disagreement reported

Offsets & Removals

Fixed

Capacity-constrained removals on residual emissions (DL-012/027)

CORSIA

Partial

Sectoral subset (SEB/SGF) equivalent in production; CGI to 2100 wired (DL-044); operator accounting + aggregation identities standalone (DL-045/046/137)

Costs

Exact (standalone)

All 22 equations incl. MAC and per-payload-distance costs (DL-134); production still emits the legacy series; currency year unstated by CASCADE

Scenarios / Ambition / Bounds

Partial

9+ presets incl. Boeing-CMO root (DL-164); 5-level ambition tables; aircraft bounds encoded (DL-029)

How to cite#

When quoting HyFlux outputs, cite the engine version and the parity basis:

HyFlux v10 (hyflux-lca), methodology parity with Boeing’s public CASCADE documentation [Boeing, 2026] as registered in cascade-coverage-matrix.csv; synthetic traffic and reference-aircraft data throughout — no Cirium or Boeing proprietary data.

Never present HyFlux results as CASCADE results, and never claim data-level parity (see Methodology Parity for the standing rules).

Contents#