What is needed is for someone else with one of DJI’s next gen drones to try Atti mode 
I can’t even bring myself to put a mod on my mini4 … to risk adverse! 
As JockyB and Camera-On said, this is what I was thinking.
(My detailed knowledge of drones is limited, but I am an electronic technician, so I understand some principles of control systems.)
Two possibilities:
Your drone may actually be going faster than indicated, but the GPS unit data output is flagging itself as “Invalid”, so the data logging system records blank fields.
(Just like a multimeter showing “Error” when the voltage is too high for the set range.)
Thanks Frank. But in my experience, this would result in more of a gradual decline in acceleration, and not like suddenly hitting a brick wall.
As mentioned previously, I have calculated the speed manually by dividing distance over time. So I know the registered speed is correct.
More importantly, I also know it is impossible to fly a drone manually at the exact same speed to 2 decimal places for a couple of seconds … let alone 30+ seconds.
If/when I upgrade to the Mini 4 Pro, I will add Atti mode, and perform the same test and post back.
Thanks for your reply.
Looking at your spreadsheet charts, the speed is logged every tenth of a second, and constantly changing, until you hit the 68.89775 mph barrier, then the RECORDED speed remains PRECISELY constant at that velocity.
This still suggests a measuring system that had reached the limit of its speed range, and cannot show a higher speed.
Even if it is a system set maximum, I don’t think it’s possible for the drone to actually be flying at such an incredibly consistent speed !
If the control system had reached it’s own built-in maximum speed limit, I would still expect to see some variation in the recorded speed, simply due to variations in wind speed and the time taken by the system to compensate.
Several recorded values instantly freeze or drop out altogether at that maximum speed, which also suggests that the system is flagging some of it’s own data as invalid from that point.
Perhaps the limit in the GPS speed recording system causes the control system to refuse to continue accelerating, so the speed remains fairly consistent, but only records it’s maximum capable value ?
I agree with you that it would take an experiment with another identical model to confirm whether this is a manufacturer’s design limitation.
It does not when I look at the graph.
It does zoom in.
Yes, I was looking at the values in the provided spreadsheet images, which are for a shorter period, but are quite remarkably constant.
Sorry entering the discussion only at this point. I have found on the DH MPP that 45 is too much for speeding. The body offers too much resistance, rotors send random signals of maxed out rpms, and a too high battery drainage => battery malfunction. it reaches its own max speed ( 86 km/h ) until a value of 40. On the other hand, it behaves AMAZINGLY with very high windy places, such as mountain crests or valley divings…
Hi !
This is EXACTLY what happened to me.
Used to fly a mavic Pro DH modded ( downed by an eagle @ 2600 meters high ) a Mavic Pro Platinum fully DH modded, very very quick, a Mavic Mini HD modded ( sold ) and at present a mini 2.
I used to apply a customized param chart for the mini, which I cannot find anywhere.
Flying up in the Alps I don’t allow myself to enter the try&see mode. I’d need eventually discussions about though on wind resistance, gps+ mods, and so on with Members.
Thank you for hosting me !
This is exactly my point.
We have all tried, at some point or another, to fly at a constant speed whilst recording a video. It’s virtually impossible to do it manually.
Again, I have applied Atti mode to all my drones, and have had no issue like this on any … except the Air 3. The acceleration graph for each of my Atti speed records do not have this ‘brick wall’ effect, and nor does it remain at a constant speed. Instead the speed fluctuates quite a lot.
| MPH | Drone |
|---|---|
| 100.28 | DJI Mini 2 |
| 80.26 | DJI Mavic 2 Pro |
| 76.88 | Mini 3 Pro |
| 68.96 | DJI Air 3 |
I just think that DJI have cottoned on to owners hacking their drones. They’ve probably seen Atti mentioned a few too many times in the flight logs for folk using Care Refresh.
Yes, they are constant. Unlike any other drone I’ve owned. No one can fly manually at the exact same speed to 7 decimal places.
My point is +/- 0.1
Which suggests it is not a measuring system that had reached the limit of its speed range. Agree it is not constant manual speed. There a limiter in there somewhere.
Exactly. It’s odd though because Atti mode does work as expected from it advertised max speed of 47 mph, all the way until this limiter kicks in at 68.76 mph.
Yes, with Atti (and a little wind) 
I know THAT feeling. Being up in the bushes many times in search of lost drones…
The important thing, the hat.
You are still okay !
Ahh this is the one you spent quite a lot of time looking for ( there’s a thread on it somewhere)
Yep, I knew I’d read a thread about it last year. Used to look for updates on it. You were undoubtedly fairly close at one point ( well at least to be able to connect to it) Could have been a few hundred metres away though, but given the speed it was at and the wind that day. Never mind, some archaeologist will uncover it in a few hundred years or so.
I have been tempted to go back a couple of times. But quickly talked myself out it.
They’ll have a bit of a shock if they can read the sd card
10 posts were split to a new topic: Jeep ran over my drone in Italy
