feat(export): X-Plane FDR flight-data-recorder export#702
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Adds '🎬 Export FDR' to the Export dropdown. Samples the route at 1 second intervals, computing for each point: - lat/lng via linear interpolation along each leg - altitude blended smoothly over 20 s at each waypoint transition - heading blended through the turn angle - roll from bank-angle formula: arctan(turn_rate × KTAS / 1092) - pitch from climb/descent rate - VVI in ft/min from Δalt between samples - temperature from ISA lapse rate Output is a plain-text .fdr file X-Plane opens via the FDR replay dialog. Default aircraft Cessna 172SP (editable). EN + HE strings. Closes #701 Co-authored-by: Cursor <cursoragent@cursor.com>
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Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
…es X-Plane 12 spec Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
…usable) X-Plane FDR DATA rows are fixed-position, not header-labelled. The export emitted time,lon,lat,alt,hdg,pitch,roll,IAS,VVI — which shifted every value into the wrong column (heading landed in h_msl, altitude in latitude, etc.), so X-Plane couldn't replay the route. Add fdrDataRow() that writes each value to its required column per the spec (1 time, 2 temp, 3 lon, 4 lat, 5 h_msl, 6 radio_alt, 7-9 controls, 10 pitch, 11 roll, 12 hdg true, 13 KIAS, 14 VVI, 15 slip, 16 turn). Replace the custom DREF columns with the standard fixed KIAS/VVI slots; add PRES/TEMP/WIND header lines. tests/export-fdr.spec.js asserts the column positions + altitude ramp.
X-Plane reported "Out of range FDR-file heading … 2000" — it was reading our altitude (col 5) as the heading. The 'A'/'3' version line forced X-Plane's compact parser (heading = 5th value); the documented keyword format has no version line and uses the 80-column DATA order with heading in its fixed far column. Remove the 'A'/'3' lines; keep the 80-col rows. Also: describe each export type in the dropdown labels (JSON/GPX/PLN/FDR), en + he.
X-Plane 12 rejected the header-less/legacy 80-col layout ("Old,
non-supported FDR format") and, with an A/3 header but 80-col rows, read
the altitude as the heading ("Out of range … 2000"). V3 wants the COMPACT
positional order: time, lon, lat, alt_ft, heading_true, pitch, roll — with
heading as the 5th value (confirmed by X-Plane's own error). Restore the
A/3 version header and emit compact rows. Reference: lavirott/tofdr.
Replaced the per-leg straight-line sampler (which kinked instantly at each waypoint) with a curved path: each interior waypoint is rounded with a banked-turn arc of radius R = V²/(g·tan φ) at φ=18°, computed in a local metres projection and clamped so adjacent turns don't overlap. The path is resampled at 1 s and heading is taken from the path tangent, roll from the heading rate (tan φ = ω·V/g, signed by turn direction), and pitch from the climb rate — so X-Plane replays natural, banked turns instead of snapping direction at the corners. Altitude is smoothed (±20 s) for gradual climbs.
…to feat/fdr-export
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Adds 🎬 Export FDR to the Export dropdown so pilots can pre-fly their CVFR route in X-Plane as a replay.
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References
Closes #701
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