Long Altitude Fence Flight

Flight telemetry summary

Distance Meters

130.7 m

Maximum Altitude AGL

98.1 m

Maximum Ground Speed

7.13 m/s

Minimum Battery Percent

0%

Minimum Battery Voltage

12.21 V

Minimum GPS Satellites

10

Maximum GPS HDOP

1.21

Flight Modes

LOITER, RTL, STABILIZE, LOITER, RTL, LOITER, RTL, LOITER

Maximum Distance From Home Meters

32.8 m

Maximum Distance From Home Time

5m 22s

Average Ground Speed

4.39 m/s

Maximum Climb Rate MPS

2.03 m/s

Maximum Descent Rate MPS

-1.58 m/s

Battery Consumed MAH

3754 mAh

Battery Consumed Wh

46.22 Wh

Voltage Sag

0.39 V

Flight Mode Seconds

LOITER: 5m 40s, RTL: 2m 41s, STABILIZE: 2s

Maximum GForce

1.52 g

Compass Healthy

Yes

EKF Healthy

Yes

Maximum GPS Accuracy Meters

0.3 m

CPU Load Max Percent

0%

Arming Method

rudder

Weather at the flight

Source

open-meteo-archive

Sampled At Utc

2026-07-20T10:00Z

Latitude

-35.36

Longitude

149.17

Temperature C

5.2 °C

Wind Speed MPS

0.41 m/s

Wind Direction Degrees

76

Wind Direction Cardinal

ENE

Weather Code

0

Weather Description

Clear

AI flight report

This flight log covers 8 minutes 23 seconds (503 s) of activity with a total track distance of 131 m and a farthest distance from home of 33 m (at 5:22). The vehicle climbed to a maximum of 98 m above home (noted at 1:07) and spent most of the time in LOITER (5:40), with 2:41 in RTL and 0:02 in STABILIZE. Average moving speed was 4.4 m/s, maximum ground speed 7.1 m/s (noted at 7:25). Weather was calm and clear: 5.2°C with a very light ENE wind of 0.41 m/s. GPS remained steady (10 satellites, HDOP 1.21).

The flight profile shows an initial climb to 98 m, a descent and an RTL event at 2:58 that resulted in a landing and disarm at 3:55. The log then records several mode changes around 3:57 (three repeated RETURN_TO_LAUNCH warnings followed by STABILIZE then LOITER) and further activity, with BATTERY_LOW at 5:03, a commanded or automatic RTL at 5:19, and BATTERY_CRITICAL at 6:06 followed by a landing and disarm at 6:07. Battery consumption for the session is 3,754 mAh (46.2 Wh) and a reported voltage sag of 0.39 V; telemetry shows voltage staying around 12.3 V (minimum recorded 12.21 V). One notable anomaly is the state-of-charge reported as 0% from 7:30 onward while voltage remained ~12.3 V and the minimum logged voltage is 12.21 V — this inconsistency is likely (but not certain) an SoC estimation or battery monitor calibration issue rather than an immediate low-voltage failure. GPS quality was good throughout.

Recommendations: (1) Verify and calibrate the battery monitoring settings (cell count, capacity, and voltage thresholds) and check the battery fuel-gauge algorithm — the 0% SoC while voltage is ~12.3 V suggests the percentage estimator needs adjustment. (2) Review failsafe and mode-change triggers, and examine the log around 3:57 for why multiple RTL warnings occurred in rapid succession (check RC switch assignments and any ground-station commands). Those two steps will reduce unexpected mode switches and ensure low-battery actions (RTL/land) occur with reliable battery state information.

Detected flight events

1. 2s — Vehicle armed

   Armed at 0:02 with battery 100% (12.6 V) — motors enabled and aircraft ready for takeoff.

2. 2s — Flight mode changed to LOITER

   Mode set to LOITER at 0:02 — engaging GPS position‑hold to stabilize before climb.

3. 5s — Takeoff

   Takeoff at 0:05 — climb began, reaching ~5.8 m by 0:15 with initial climb rates up to ~2.0 m/s; battery fell to 97%.

4. 1m 7s — Maximum altitude: 98 m above home

   RTL commanded at 2:58 — autopilot began returning toward home while descending from the earlier peak altitude.

5. 2m 58s — Flight mode changed to RTL

   Landing complete at 3:55 — vehicle on ground, ending that RTL approach.

6. 3m 55s — Landing complete

   Disarmed at 3:55 after landing — motors disabled and aircraft made safe on the ground (battery ≈ mid‑40%).

7. 3m 55s — Vehicle disarmed

   First of three RTL entries at 3:57 while disarmed — duplicate RTL messages logged shortly after landing (likely redundant inputs or telemetry artifacts).

8. 3m 57s — Flight mode changed to RTL

   Second RTL entry at 3:57 — another repeat of the return command with no airborne movement recorded.

9. 3m 57s — Flight mode changed to RTL

   Third RTL entry at 3:57 — third redundant RTL message; vehicle remained on ground.

10. 3m 57s — Flight mode changed to RTL

    Mode switched to STABILIZE at 3:58 — selected manual attitude control on the ground prior to next action.

11. 3m 58s — Flight mode changed to STABILIZE

    Mode changed to LOITER at 4:00 — re‑engaged position hold; vehicle later rose to ~4 m by 4:15.

12. 4m 0s — Flight mode changed to LOITER

    LOITER confirmed at 4:05 — stable hover continued while systems were monitored.

13. 4m 5s — Flight mode changed to LOITER

    Battery low at 5:03 (below 30%) — battery crossed the 30% threshold (≈31% at 5:00 then 28% by 5:15), prompting advisory.

14. 5m 3s — Battery below 30%

    RTL commanded at 5:19 — vehicle began returning home under RTL; forward motion observed (2.5 m/s at 5:30).

15. 5m 19s — Flight mode changed to RTL

    Battery critical at 6:06 (below 15%) — critical battery level reached, triggering immediate landing behavior (≈17% at 6:00, 15% by 6:15).

16. 6m 6s — Battery below 15%

    Landing complete at 6:07 — touchdown executed in response to critical battery.

17. 6m 7s — Landing complete

    Disarmed at 6:08 after landing — motors off while battery was at or below critical level.

18. 6m 8s — Vehicle disarmed

    Mode set to LOITER at 6:09 — mode change on ground, likely operator checks or setup.

19. 6m 9s — Flight mode changed to LOITER

    LOITER again at 6:14 — loiter state maintained during ground/hover activity.

20. 6m 14s — Flight mode changed to LOITER

    Maximum ground speed recorded 7.1 m/s at 7:25 — peak horizontal speed for performance and energy analysis.

21. 7m 25s — Maximum ground speed: 7.1 m/s

    RTL commanded at 7:32 — final return initiated while battery had dropped to 0% by 7:30 (likely caused by battery depletion).

22. 7m 32s — Flight mode changed to RTL

    Landing complete at 8:21 — final touchdown after descent to ~2 m by 8:15.

23. 8m 21s — Landing complete

    Disarmed at 8:21 — motors disabled immediately after final landing, flight ended.

24. 8m 21s — Vehicle disarmed

    Mode changed to LOITER at 8:22 — post‑flight mode set on the ground; no further movement recorded.

25. 8m 22s — Flight mode changed to LOITER

    Flight mode changed to LOITER. The pilot or autopilot switched control behavior here.