Engine HUD

📢 - INFO

If your flight log has engine data, StolWRX overlays a live engine gauge panel on the map that follows the strip chart cursor. It's a replica of the typical six-pack of engine instruments — handy for replaying an incident or debugging a run-up.

When It Appears

The Engine HUD appears automatically whenever the loaded flight log has any columns whose name starts with E1, E2, etc. (for example E1 MAP, E1 RPM, E1 CHT1, E1 EGT4, E1 OilT). If the log has no engine columns, the HUD is hidden.

If more than one engine is logged (twin-engine), StolWRX picks the lowest- numbered engine it finds.

Gauges Shown

The HUD groups values into three sections:

Arc gauges

Round, analog-style gauges with a needle sweeping an arc. Color zones follow standard aviation conventions: green = normal, yellow = caution, red = danger / limit.

• MAP — Manifold Pressure (inches Hg). Range 10–35.
• RPM — Engine RPM. Range 0–3000.

Horizontal bars

• Fuel Flow — GPH. Range 0–30. Green bar (no typical caution zones).
• Oil Pressure — PSI. Range 0–120 with yellow/red zones on both ends.
• Oil Temp — °F. Range 0–260 with yellow/red zones on both ends.

Fuel Quantity

Two bar indicators (L/R tanks) showing current fuel. Turns yellow below 25% of max, red below 15%.

Cylinder bar charts

Two vertical bar groups:

• CHT — Cylinder Head Temperature. One bar per cylinder (E1 CHT1…E1 CHT6). Red above 435 °F, yellow above 400 °F.
• EGT — Exhaust Gas Temperature. One bar per cylinder. Red above 1650 °F, yellow above 1500 °F.

Following the Strip Chart

The HUD values update to match whatever row the Strip Chart cursor is on. Dragging the cursor across the chart animates the gauges and bars in real time — you can see CHTs spike after a low-pass or fuel flow drop after a leaning sweep.

Position on the Map

The HUD floats in a corner of the map (typically top-right). It's a visual overlay only — it doesn't intercept clicks on the track or waypoints underneath.

On narrow screens, the HUD collapses to a smaller footprint so it doesn't cover the whole map.

Limit Values

The green/yellow/red zones are sourced from engineHudConfig.ts in the app. The current defaults are tuned for Lycoming IO-390 / IO-540 class engines in common backcountry airplanes. The limits are hard-coded in the app at this time — a future update may make them per-flight configurable.

Gauge	Units	Range	Notes
MAP	inHg	10–35	Yellow zones near min and max
RPM	rpm	0–3000	Red-line ~2790 (93%)
Fuel Flow	GPH	0–30	All green
Oil Pressure	PSI	0–120	Yellow <30, >90; Red <18, >108
Oil Temp	°F	0–260	Yellow <52, >208; Red <26, >239
CHT	°F	—	Yellow ≥400, Red ≥435
EGT	°F	—	Yellow ≥1500, Red ≥1650
Fuel Qty	gal	0–40	Yellow <25%, Red <15%

Shared Flights

The Engine HUD is shown on public shared views too, as long as the shared flight log has engine columns. The recipient sees the same gauges animate as they scrub through the shared crop.