400m demo flight

Flight telemetry summary

Distance Meters

3715.6 m

Maximum Altitude AGL

404.7 m

Maximum Ground Speed

11.25 m/s

Minimum Battery Percent

0%

Minimum Battery Voltage

20.87 V

Minimum GPS Satellites

13

Maximum GPS HDOP

1.63

Flight Modes

STABILIZE, ALT_HOLD, LOITER

Maximum Distance From Home Meters

1266.9 m

Maximum Distance From Home Time

4m 18s

Average Ground Speed

6.74 m/s

Maximum Climb Rate MPS

4.73 m/s

Maximum Descent Rate MPS

-3.04 m/s

Battery Consumed MAH

3707.6 mAh

Battery Consumed Wh

80.73 Wh

Voltage Sag

2.6 V

Flight Mode Seconds

STABILIZE: 2m 8s, ALT_HOLD: 12s, LOITER: 7m 19s

Maximum GForce

3.4 g

Compass Healthy

Yes

EKF Healthy

Yes

Maximum GPS Accuracy Meters

0.72 m

Board Temp Max C

54.9 °C

CPU Load Max Percent

19.5%

Weather at the flight

Source

open-meteo-archive

Sampled At Utc

2026-07-17T07:00Z

Latitude

45.54

Longitude

18.64

Temperature C

27 °C

Wind Speed MPS

0.52 m/s

Wind Direction Degrees

107

Wind Direction Cardinal

ESE

Weather Code

0

Weather Description

Clear

AI flight report

The flight "demo-400m" ran for 9:39 (579 s) starting at 2026-07-17T06:38:01Z. The quadcopter flew a total track distance of 3,716 m, reached a maximum altitude of 405 m above home (peak at 02:10) and was farthest from home at 1,267 m (at 04:18). The vehicle accelerated to a maximum ground speed of 11.2 m/s (recorded at 01:55) with an average moving speed of 6.7 m/s. Climb and descent peaks were 4.7 m/s and −3.0 m/s respectively. Weather at the time was clear, about 27.0°C with very light ESE wind (~0.5 m/s). The flight began and climbed in STABILIZE (about 2:08 total), switched briefly to ALT_HOLD around 02:08–02:20, then spent the remaining ~7:19 in LOITER while operating at altitude.

Notable events centered on battery state. The system auto-armed and took off at 00:02, BATTERY_LOW was logged at 05:42 and BATTERY_CRITICAL at 07:04; telemetry shows battery percentage passing ~30% around 05:45 and ~16% at 07:00, then continuing down to 0% readings from 08:30 onwards while the vehicle remained airborne and landed normally at 09:36. Total measured battery usage was 3,708 mAh (80.7 Wh), about 998 mAh per km, with a recorded voltage sag of 2.60 V and a minimum measured pack voltage of 20.87 V. GPS reception and horizontal accuracy were good throughout (satellites never below 13, HDOP max 1.63). No GPS dropouts or mode failures are recorded; the flight completed a controlled descent and landing and was disarmed at 09:37.

Actionable recommendations: first, investigate the battery state-of-charge reporting and telemetry (cell monitoring, voltage-sensor calibration, and the battery capacity setting) because the percentage reached 0% while pack voltage remained above ~21 V and the aircraft continued flying to a normal landing — this suggests the fuel-gauge estimate or configuration may be off. Second, given the long range (1.27 km from home) and the fairly high energy usage (≈998 mAh/km), consider setting more conservative low-battery and return-to-home thresholds or earlier alerts for long missions, and verify the failsafe/RTL behaviors in bench tests so there is clear margin for the return leg.

Detected flight events

1. 2s — Vehicle auto-armed

   Auto-armed at 00:02 with battery 99% and 16 GPS sats (HDOP 0.89) — preflight power and navigation checks looked good.

2. 2s — Takeoff

   Takeoff at 00:02; climbing immediately (5.5 m AGL at 0:15, vertSpeed 1.1 m/s) starting the ascent toward cruise altitude.

3. 1m 55s — Maximum ground speed: 11.2 m/s

   Reached maximum ground speed 11.2 m/s at 1:55 — this increases power draw and reduces remaining endurance.

4. 2m 8s — Flight mode changed to ALT_HOLD

   Mode changed to ALT_HOLD at 2:08 to hold altitude after climb; altitude was about 405 m (404.7 m at 2:15).

5. 2m 10s — Maximum altitude: 405 m above home

   Reached maximum altitude 405 m above home at 2:10 — flight ceiling reached, important for descent planning and battery use.

6. 2m 20s — Flight mode changed to LOITER

   Switched to LOITER at 2:20 to hold position near 404 m AGL for the mission phase; speed stabilized while loitering.

7. 5m 42s — Battery below 30%

   Battery dropped below 30% at 5:42 (≈30% at 5:45) — low-battery warning; total flight consumption later logged as 3708 mAh.

8. 7m 4s — Battery below 15%

   Battery critical below 15% at 7:04 (≈16% at 7:00, 13.2% at 7:15); immediate return/landing required — voltage sag noted (2.60 V).

9. 9m 36s — Landing complete

   Landing completed at 9:36 after final descent; aircraft on ground and battery had reached 0% during the late phase (min volts 20.87 V).

10. 9m 37s — Vehicle disarmed

    Disarmed at 9:37; flight ended (9:39), track distance 3716 m, max altitude 405 m and max ground speed 11.2 m/s recorded.