{
  "id": "FN-02-CAD-REGISTER",
  "revision": "V0.1 / 2026-10-16",
  "units": "Metres in register; mm for CAD exchange",
  "release_status": "Reference-envelope study / not detailed or manufacturing CAD",
  "coordinate_convention": {
    "origin": "Proposed nose/spinner station; not OEM weight-and-balance datum",
    "X": "positive aft",
    "Y": "positive right",
    "Z": "positive up",
    "planes": "XY top / XZ side / YZ front",
    "note": "Ground height, fuselage reference line and aircraft weight-and-balance datum must be reconciled before station release"
  },
  "parameters": [
    {
      "key": "span",
      "label": "Wingspan b",
      "value": 10.7,
      "unit": "m",
      "status": "REFERENCE",
      "basis": "Published reference / adopted FN envelope; not demonstrated FN as-built geometry",
      "source_url": "https://www.pipistrel-aircraft.com/products/explorer/"
    },
    {
      "key": "length",
      "label": "Overall length L",
      "value": 6.42,
      "unit": "m",
      "status": "REFERENCE",
      "basis": "Published reference / adopted FN envelope; not demonstrated FN as-built geometry",
      "source_url": "https://www.pipistrel-aircraft.com/products/explorer/"
    },
    {
      "key": "height",
      "label": "Overall height H",
      "value": 2.08,
      "unit": "m",
      "status": "REFERENCE",
      "basis": "Published reference / adopted FN envelope; not demonstrated FN as-built geometry",
      "source_url": "https://www.pipistrel-aircraft.com/products/explorer/"
    },
    {
      "key": "wing_area",
      "label": "Wing area S",
      "value": 9.51,
      "unit": "m²",
      "status": "REFERENCE",
      "basis": "Published reference / adopted FN envelope; not demonstrated FN as-built geometry",
      "source_url": "https://www.pipistrel-aircraft.com/products/explorer/"
    },
    {
      "key": "semispan",
      "label": "Centerline-to-tip envelope b/2",
      "value": 5.35,
      "unit": "m",
      "status": "DERIVED",
      "basis": "b / 2; gross envelope, not exposed structural wing length",
      "source_url": ""
    },
    {
      "key": "aspect_ratio",
      "label": "Aspect ratio AR",
      "value": 12.0389,
      "unit": "",
      "status": "DERIVED",
      "basis": "b² / S; uses published reference span and area conventions",
      "source_url": ""
    },
    {
      "key": "mean_geometric_chord",
      "label": "Mean geometric chord S/b",
      "value": 0.8888,
      "unit": "m",
      "status": "DERIVED",
      "basis": "Area divided by span; this is NOT mean aerodynamic chord (MAC)",
      "source_url": ""
    },
    {
      "key": "symmetry_plane",
      "label": "CAD symmetry plane",
      "value": 0,
      "unit": "mm / Y",
      "status": "CONVENTION",
      "basis": "Proposed FN datum; mirror geometry about Y=0, not a measured OEM dimension",
      "source_url": ""
    },
    {
      "key": "drawing_origin",
      "label": "Nose / spinner reference station",
      "value": 0,
      "unit": "mm / X",
      "status": "CONVENTION",
      "basis": "Proposed CAD-only origin: X aft, Y right, Z up; height-ground datum kept separate",
      "source_url": ""
    },
    {
      "key": "wing_incidence_root",
      "label": "Wing root incidence / i_w",
      "value": null,
      "unit": "deg",
      "status": "UNCONFIRMED",
      "basis": "Root chord เทียบ fuselage CAD reference line; geometric incidence ไม่ใช่ flight AoA · manufacturer rigging drawing / AMM or independent analysis required",
      "source_url": ""
    },
    {
      "key": "wing_dihedral",
      "label": "Wing dihedral / Γ",
      "value": null,
      "unit": "deg",
      "status": "UNCONFIRMED",
      "basis": "แนวยกของ main-wing reference line ใน front view ไม่รวมปลายปีกโค้ง · manufacturer rigging drawing / AMM or independent analysis required",
      "source_url": ""
    },
    {
      "key": "wing_quarter_chord_sweep",
      "label": "Quarter-chord sweep / Λc/4",
      "value": null,
      "unit": "deg",
      "status": "UNCONFIRMED",
      "basis": "แนว 25% chord ใน top view; อย่าใช้ leading-edge sweep แทน · manufacturer rigging drawing / AMM or independent analysis required",
      "source_url": ""
    },
    {
      "key": "wing_washout",
      "label": "Geometric washout / ε",
      "value": null,
      "unit": "deg",
      "status": "UNCONFIRMED",
      "basis": "i_root − i_tip; บวกหมายถึง tip incidence ต่ำกว่า root ตาม convention นี้ · manufacturer rigging drawing / AMM or independent analysis required",
      "source_url": ""
    },
    {
      "key": "tail_incidence",
      "label": "Horizontal tail incidence / i_t",
      "value": null,
      "unit": "deg",
      "status": "UNCONFIRMED",
      "basis": "Tail root chord เทียบ fuselage reference line; ต้องทำ trim / CG analysis · manufacturer rigging drawing / AMM or independent analysis required",
      "source_url": ""
    },
    {
      "key": "decalage",
      "label": "Wing–tail decalage / Δi",
      "value": null,
      "unit": "deg",
      "status": "UNCONFIRMED",
      "basis": "i_w − i_t; คำนวณเมื่อยืนยัน incidence ทั้งสองค่า · manufacturer rigging drawing / AMM or independent analysis required",
      "source_url": ""
    },
    {
      "key": "fin_sweep",
      "label": "Fin sweep",
      "value": null,
      "unit": "deg",
      "status": "UNCONFIRMED",
      "basis": "ต้องระบุว่าวัดที่ leading edge หรือ quarter chord · manufacturer rigging drawing / AMM or independent analysis required",
      "source_url": ""
    },
    {
      "key": "wingtip_cant",
      "label": "Wingtip cant / toe / transition",
      "value": null,
      "unit": "deg",
      "status": "UNCONFIRMED",
      "basis": "มุมยกปลายปีก, toe และรัศมีเปลี่ยนผิวเป็นคนละ parameter · manufacturer rigging drawing / AMM or independent analysis required",
      "source_url": ""
    },
    {
      "key": "engine_thrust_angles",
      "label": "Engine downthrust / sidethrust",
      "value": null,
      "unit": "deg",
      "status": "UNCONFIRMED",
      "basis": "Thrust axis เทียบ body reference และ symmetry plane · manufacturer rigging drawing / AMM or independent analysis required",
      "source_url": ""
    },
    {
      "key": "control_travel",
      "label": "Aileron / flap / elevator / rudder limits",
      "value": null,
      "unit": "deg",
      "status": "UNCONFIRMED",
      "basis": "มุมจาก neutral ถึง mechanical stops ต้องได้จาก AMM/SAMM ที่ตรงรุ่น · manufacturer rigging drawing / AMM or independent analysis required",
      "source_url": ""
    },
    {
      "key": "root_chord",
      "label": "Root chord / tip chord / taper",
      "value": null,
      "unit": "m / mm",
      "status": "UNCONFIRMED",
      "basis": "Need verified planform stations; cannot recover both chords from b and S alone",
      "source_url": ""
    },
    {
      "key": "mac",
      "label": "MAC and its station",
      "value": null,
      "unit": "m / mm",
      "status": "UNCONFIRMED",
      "basis": "Integrate verified chord distribution; S/b is not MAC",
      "source_url": ""
    },
    {
      "key": "wing_station",
      "label": "Wing root / quarter-chord station",
      "value": null,
      "unit": "m / mm",
      "status": "UNCONFIRMED",
      "basis": "X/Z location relative to chosen datum and cabin/CG",
      "source_url": ""
    },
    {
      "key": "tail_arm",
      "label": "Tail arm / stabilizer area / tail volume",
      "value": null,
      "unit": "m / mm",
      "status": "UNCONFIRMED",
      "basis": "Wing MAC and tail aerodynamic-center coordinates required",
      "source_url": ""
    },
    {
      "key": "fuselage_stations",
      "label": "Fuselage cross-section stations",
      "value": null,
      "unit": "m / mm",
      "status": "UNCONFIRMED",
      "basis": "X/Y/Z sections from dimensional drawing or measured object, not perspective render",
      "source_url": ""
    },
    {
      "key": "gear_geometry",
      "label": "Wheelbase / track / prop clearance",
      "value": null,
      "unit": "m / mm",
      "status": "UNCONFIRMED",
      "basis": "Loaded/unloaded gear geometry, tire radius, stroke and CG cases",
      "source_url": ""
    },
    {
      "key": "joint_design",
      "label": "Spar / fastener / rib pitch / skin gauge",
      "value": null,
      "unit": "m / mm",
      "status": "UNCONFIRMED",
      "basis": "Metal structure sizing, joint allowables, buckling/fatigue and test evidence",
      "source_url": ""
    }
  ],
  "source_issues": [
    {
      "label": "Height source conflict",
      "detail": "Selected Explorer product envelope H=2.08 m; historical TCDS Issue 11 (01 Mar 2022), Section D p18 lists H=1.90 m. Keep 2.08 m as selected concept envelope; reconcile configuration, datum and revision before CAD release.",
      "url": "https://www.pipistrel-aircraft.com/wp-content/uploads/2023/04/TCDS-EASA.A.573-issue-11.pdf"
    }
  ],
  "release_requirements": [
    "Applicable manufacturer geometry/rigging drawings and AMM/SAMM revision",
    "Confirmed airfoil coordinate files, chord distribution, twist and reference axes",
    "Independent metal/fabric mass, CG, load, stability and flutter analysis",
    "Reviewed component interface-control drawings and manufacturing tolerances"
  ]
}