Horizontal and rotational speed curves ripples as drone speed increases
Hi,
I have created a path that circles around a subject, using multiple waypoints. The path is not perfectly circular (https://app.dronelink.com/domenicomanildo/vimercate/plan/YJYcrWh2Nip1f5SRwn4E) but similar to an orbit. When I fisrt executed it at 15 Km/h with a Mini I noticed severe jerkiness, so I decided to slow down the speed to 10 Km/h and the jerkiness disapperared. But then I made further tests and noticed that when speed increases over 12 Km/h the horizontal and rotational speeds start to have some sudden changes that become extremely evident at 20 Km/h. See the different graphs below. I would have expected that the curves would simply move up to higher values, while keeping the shape unaltered.
Instead, if I use an orbit in place of the waypoint path, increasing the speed of the drone does not modify the shape of the speed curves at all, so the increase of speed does not alter the shape of the curve, as I would expect.
I don't know if this behavior can someohow explain the jerkiness that I noticed in the first place, that could be attributed instead to the relative slowness of my mobile phone (iphone X), nevertheless I find it a bit strange that the speed increment creates such a difference in the plan in terms of variations of the rotational and horizontal speed, that can easily induce jerky movements in the flight
Horizontal and rotational speed with path speed set at 10 Km/h
Same variables with speed set at 12 Km/h
Now speed moves to 15 Km/h
Finally at 20 Km/h
Comments
5 comments
Thanks for the report - definitely some interesting findings. One thing I noticed is that the dips in rotational velocity always correspond to when the drone passes by a waypoint, which does provide at least a clue to why this might be happening. There is a lot of complicated of math behind the scenes here so determining what the root cause of the issue will not be easy. For now, fly slower :)
Hi, yesterday I tested the path with the 4 speeds. The jerkiness I had noticed in the past at 15 Km/h was no longer there (but I have changed other parameters in the meanwhile, so I will do some more test to verify if the smoothness I have now was due to the change of these parameters and let you know). Now the only jerks visible in the path are the ones that are visible in the curves. I can send you the videos if you wish, just let me know how.
When you say the jerkiness wasn't there, do you mean in the previewer or in the real world? If you can narrow it down to which parameters are having which effect, that would be awesome. If you want to post a video to youtube or dropbox that would be great.
The jerkiness wasn't there in the real world, yesterday
In the goodle drive link below you will find the videos at 15 km/h and 20 km/h done yesterday and the jerky one at 15 km/h done a week ago before I changed some parameters. I will bring these parameters back to their original values (default) and see if the jerkiness reappears. If so, we will have the culprits and I will share them with you.
https://drive.google.com/drive/folders/1HeWmkJQa2-biFmUtGOH5qpz7TWwt9iQL?usp=sharing
👍
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