PX4 Generic Quadcopter · 2023-08-10

Flight telemetry summary

Distance Meters

0 m

Maximum Altitude AGL

4.3 m

Maximum Ground Speed

0.23 m/s

Minimum Battery Percent

0%

Minimum Battery Voltage

0.13 V

Minimum GPS Satellites

28

Maximum GPS HDOP

0.82

Flight Modes

POSCTL

Maximum Distance From Home Meters

0.6 m

Maximum Distance From Home Time

41s

Average Ground Speed

0 m/s

Maximum Climb Rate MPS

0.53 m/s

Maximum Descent Rate MPS

-2.28 m/s

Battery Consumed MAH

2.3 mAh

Battery Consumed Wh

0 Wh

Voltage Sag

0.02 V

Flight Mode Seconds

POSCTL: 46s

Maximum GForce

12.1 g

EKF Healthy

Yes

Weather at the flight

Source

open-meteo-archive

Sampled At Utc

2023-08-10T03:00Z

Latitude

28.22

Longitude

112.99

Temperature C

30.3 °C

Wind Speed MPS

2.39 m/s

Wind Direction Degrees

33

Wind Direction Cardinal

NNE

Weather Code

51

Weather Description

Drizzle light

AI flight report

This was a very short, essentially stationary flight: 46 seconds total, with 0 m of track distance and a max speed of just 0.2 m/s. The vehicle stayed in POSCTL throughout, climbed to only 4 m above home (reached at 0:36), and never got farther than 1 m from the home point (at 0:41). Weather was mild — 30.3°C with a light 2.39 m/s breeze from the NNE and light drizzle — nothing here suggests weather drove the flight's shape. In short, this looks more like a hover/test on the spot than a real cross-country hop, and the recorded takeoff event doesn't fire until 0:27, well after the log starts, which lines up with the near-zero motion in the first half of the log.

The most concerning item is right at the start: at 0:00 the battery is already flagged critical (0% / 0.13 V) and there's a 114 m disagreement between the barometric and fused altitude estimates. That altitude gap is large enough that it's not just noise — one of the two sources was significantly wrong at that moment, though the table doesn't show which. Motor 4 also shows a saturation warning at 0:15 (1914 µs, peaking at 1949 µs at 0:16), which is close enough to the ESC's ceiling that little control authority remained on that motor. Combined with the widest motor spread of the flight (317 µs) occurring at 0:39 and the steepest attitude (25° off level) at 0:40, right where the fastest descent (-2.3 m/s) is logged — this cluster of events in the last 10 seconds suggests the aircraft was working hard to correct something (an asymmetry or a gust response) right before disarming at 0:45.

Given this, two things are worth checking before trusting this log's numbers at face value: first, confirm why battery percentage and voltage were already at critical levels at 0:00 — either the battery genuinely started depleted or the sensor/reporting chain has an issue, since 0.13-0.2 V is not a realistic flight voltage and points more toward a telemetry/logging fault than an actual near-dead pack. Second, look at motor 4 specifically around 0:15-0:40; a motor hitting 1949 µs while the airframe also shows its widest motor-spread and steepest attitude in the same short window is worth ruling out as a mechanical issue (weak motor or damaged prop) rather than normal correction, especially since this was such a low-speed, low-distance flight where large control effort wouldn't normally be expected.

Detected flight events

1. 0s — Battery below 15%

   Battery below 15%. Battery at 0%. The aircraft should land as soon as possible.

2. 0s — Barometric and fused altitude disagree by 114 m

   Barometric and fused altitude disagree by 114 m

3. 15s — Motor 4 at 1914 µs — near maximum output, little authority left

   Motor 4 at 1914 µs — near maximum output, little authority left

4. 27s — Takeoff (altitude threshold)

   Liftoff at 2 m. The aircraft leaves the ground and starts its climb.

5. 36s — Maximum altitude: 4 m above home

   Maximum altitude: 4 m above home — the highest point of this flight.

6. 45s — Vehicle disarmed

   Motors disarmed — the flight is complete.