Volts, amps and interference — transcript

00:00:00.400 --> 00:00:05.416 Volts, amps and interference: the electrical basics every drone pilot needs.

00:00:06.400 --> 00:00:12.585 Think of the wiring as a water pipe. Voltage is the pressure that pushes. Current,

00:00:12.585 --> 00:00:16.013 measured in amps, is how much actually flows.

00:00:17.400 --> 00:00:21.543 Resistance restricts the flow, like a narrow section of pipe.

00:00:21.543 --> 00:00:26.621 Power is the rate of doing work. Capacity is the energy stored in the pack.

00:00:29.900 --> 00:00:32.486 Quick check. What does voltage measure?

00:00:35.400 --> 00:00:38.744 Electrical pressure. The amount that flows is the current.

00:00:39.400 --> 00:00:44.252 Now load it up. A hard climb or a heavy payload draws more current.

00:00:44.252 --> 00:00:48.961 High current heats the wiring and the pack, and the voltage sags.

00:00:52.400 --> 00:00:57.598 A payload adds mass and its own electrical load, so plan on less flight time.

00:01:00.400 --> 00:01:04.005 Pre-flight, and the battery plug looks scorched, with a bent pin.

00:01:06.900 --> 00:01:10.499 A damaged connector is a narrow spot in the pipe.

00:01:10.499 --> 00:01:16.474 It restricts the flow and can run hot. Treat it as a safety issue, not a nuisance.

00:01:16.474 --> 00:01:19.857 Swollen battery? See the battery safety video.

00:01:21.400 --> 00:01:23.925 Wherever current flows, it makes a magnetic field.

00:01:23.925 --> 00:01:27.095 That's why the compass sits away from the batteries and motors.

00:01:31.900 --> 00:01:37.690 The site matters too. Powerlines, steel structures, reinforced concrete, vehicles,

00:01:37.690 --> 00:01:43.551 and radio towers and other transmitters can all interfere. So can your own payload.

00:01:45.900 --> 00:01:50.720 Interference is invisible. You see its effects: compass errors,

00:01:50.720 --> 00:01:55.539 erratic yaw or toilet-bowling, link warnings and video breakup.

00:01:56.900 --> 00:02:00.058 Compass warning on the slab, beside the site shed.

00:02:00.058 --> 00:02:05.259 Calibrating there won't fix a bad launch spot. Move to open ground and check again.

00:02:08.900 --> 00:02:13.059 Make reliability visible. Log battery health. Check firmware and settings.

00:02:13.059 --> 00:02:14.944 Know your payload's power demand.

00:02:14.944 --> 00:02:17.938 And put interference sources in your site assessment.

00:02:21.400 --> 00:02:26.587 Check the connectors, the leads and the antennas before launch and after recovery.

00:02:26.587 --> 00:02:30.149 Know what the aircraft does if GPS or the link degrades.

00:02:30.149 --> 00:02:32.711 The control link video covers failsafes.

00:02:34.400 --> 00:02:38.735 Recap: voltage pushes, current flows, resistance restricts.

00:02:38.735 --> 00:02:44.875 High current means heat and sag. Interference is invisible, so look for its sources.

00:02:45.225 --> 00:02:49.531 Final check. Near powerlines, the compass warns and the video starts breaking up.

00:02:49.531 --> 00:02:50.371 What do you do?

00:02:52.225 --> 00:02:55.934 Move away, toward recovery. If it keeps acting up, land or relocate.