Energy, inertia and stopping distance — transcript

00:00:00.400 --> 00:00:04.656 Energy, inertia and stopping distance: why heavier,

00:00:04.656 --> 00:00:07.767 higher and faster all need more room.

00:00:08.117 --> 00:00:13.905 Potential energy is stored by height: mass, times gravity, times height.

00:00:13.905 --> 00:00:19.852 The same drone at 120 metres carries more stored energy than at 20 metres.

00:00:19.852 --> 00:00:23.816 If it falls, there's more to dissipate on impact.

00:00:24.166 --> 00:00:29.224 Kinetic energy is the energy of motion: half the mass, times speed squared.

00:00:29.224 --> 00:00:34.615 Because speed is squared, double your speed and you carry four times the energy.

00:00:36.666 --> 00:00:41.473 Energy changes form. Climb, and speed turns into height. Descend,

00:00:41.473 --> 00:00:46.279 and height turns back into speed. In a glide, height is the fuel.

00:00:46.666 --> 00:00:50.846 Quick check. Double your speed. What happens to the kinetic energy?

00:00:51.866 --> 00:00:53.433 Four times as much.

00:00:55.166 --> 00:00:59.965 Inertia is resistance to a change in motion. A moving drone wants to keep moving.

00:00:59.965 --> 00:01:02.832 Release the stick, and it pitches back to brake,

00:01:02.832 --> 00:01:07.104 but it keeps travelling while it slows. Momentum is mass times velocity.

00:01:10.166 --> 00:01:15.691 Add mass, and it takes more distance to stop. Add speed, and it takes much more.

00:01:15.691 --> 00:01:21.216 Turning and climbing work the same way: more mass and more speed need more room.

00:01:23.166 --> 00:01:28.048 Downwind, groundspeed builds quickly. Slow down early, well before the boundary,

00:01:28.048 --> 00:01:30.036 and give the drone room to stop.

00:01:33.166 --> 00:01:37.983 That's why buffers matter. Keep 30 metres from people not involved in the flight,

00:01:37.983 --> 00:01:41.213 and add more room when you're fast, heavy or downwind.

00:01:41.213 --> 00:01:43.798 Slow down before you enter a confined area.

00:01:47.166 --> 00:01:51.886 A payload adds mass. The drone is slower to stop, climb or turn,

00:01:51.886 --> 00:01:57.694 and carries more energy if something goes wrong. It can shift the balance, too.

00:01:57.694 --> 00:02:00.671 When you're loaded, plan bigger margins.

00:02:01.166 --> 00:02:07.652 Recap: height stores energy, speed carries it, and inertia resists change. Heavier,

00:02:07.652 --> 00:02:09.891 higher, faster: more margin.

00:02:10.241 --> 00:02:15.861 Final check. A loaded drone, flying fast and downwind, nears the edge of its area.

00:02:15.861 --> 00:02:16.876 Best response?

00:02:17.341 --> 00:02:18.490 Slow down early.