{
  "title": "Illustrative air-cycle concept: drawing method and limits",
  "purpose": "A qualitative teaching diagram of possible air cooling, heating, expansion and exhaust stages.",
  "assets": [
    "air-cycle-concept.svg",
    "air-cycle-concept-mobile.svg"
  ],
  "drawing_method": "Original vector illustration prepared for this educational site. Three stages are arranged in reading order. Arrows indicate a proposed conceptual sequence only.",
  "assumptions": [
    "The diagram does not specify a working fluid composition, flow rate, pressure, temperature or component dimensions.",
    "No measured power input, heat rejection, exhaust state, thrust or vehicle performance is represented."
  ],
  "evidence_boundary": "The illustration is not an engineering design, experimental result or validated thermodynamic cycle. It does not show that energy recovery can exceed the energy and momentum costs of the complete system.",
  "reproducibility": "The vector assets are hand-authored SVG. No external image or experimental data is embedded."
}