Welcome Inspire Pilots!
Join our free DJI Inspire community today!
Sign up

Erratic low level flight

Joined
Dec 5, 2019
Messages
70
Reaction score
24
Age
50
In the past few days my inspire has just been going nuts at lower levels. Soon after take off it is very spazzy lurching around stopping and starting. it seems to behave a bit better after I put the gear up but still isn't right. I had a shot yesterday where I had to hover about 30 ft above a bunch of parked cars and the drone just would not sit still in GPS mode. Even if I put it in Atti mode. At one point I was in tripod mode and that was working okay, when I took it out of tripod mode it immediately began spiraling around in about a 3 to 4-ft spiral. Not good When I bring it in for a landing it lurches around sometimes lurching two or three feet off to one side unexpectedly up and down and it typically ends up dropping itself the last 6-in. Today I will calibrate the IMU and see if that helps.
one other thing in the mix, you may have seen from one of my other posts that I have mounted the DJI air unit for FBV on this bird, but I was careful not to block any of the visual sensors underneath. I was theorizing that maybe the antennas were in the field of view of those sensors and were causing some problems, but even when I turn those sensors off I'm still having the same issues so I removed the air unit yesterday afternoon and did another flight and I think I may have had smoother results but it's hard to say. More testing today. Full IMU calibration as well as visual calibration and we'll see how we go from there.
I'm currently working on a TV show, so there's always a big crowd of production people standing around and it's either dangerous or simply embarrassing to have sketchy landings or to not be able to hold a steady shot when they want a nice up close beauty shot of a car that slowly pulls away and the drone is lurching around like a spaz.
Any other thoughts?
 
  • Like
Reactions: BrianZ
Joined
Dec 10, 2018
Messages
39
Reaction score
16
Age
68
Location
Colorado
In the past few days my inspire has just been going nuts at lower levels. Soon after take off it is very spazzy lurching around stopping and starting. it seems to behave a bit better after I put the gear up but still isn't right. I had a shot yesterday where I had to hover about 30 ft above a bunch of parked cars and the drone just would not sit still in GPS mode. Even if I put it in Atti mode. At one point I was in tripod mode and that was working okay, when I took it out of tripod mode it immediately began spiraling around in about a 3 to 4-ft spiral. Not good When I bring it in for a landing it lurches around sometimes lurching two or three feet off to one side unexpectedly up and down and it typically ends up dropping itself the last 6-in. Today I will calibrate the IMU and see if that helps.
one other thing in the mix, you may have seen from one of my other posts that I have mounted the DJI air unit for FBV on this bird, but I was careful not to block any of the visual sensors underneath. I was theorizing that maybe the antennas were in the field of view of those sensors and were causing some problems, but even when I turn those sensors off I'm still having the same issues so I removed the air unit yesterday afternoon and did another flight and I think I may have had smoother results but it's hard to say. More testing today. Full IMU calibration as well as visual calibration and we'll see how we go from there.
I'm currently working on a TV show, so there's always a big crowd of production people standing around and it's either dangerous or simply embarrassing to have sketchy landings or to not be able to hold a steady shot when they want a nice up close beauty shot of a car that slowly pulls away and the drone is lurching around like a spaz.
Any other thoughts?
If IMU calibration does not solve the problem then calibrate the RC sticks. I fixed both my Inspire aircrafts from jumping all around by calibrating the RC sticks. Let us know what works.
 
Joined
Dec 5, 2019
Messages
70
Reaction score
24
Age
50
If IMU calibration does not solve the problem then calibrate the RC sticks. I fixed both my Inspire aircrafts from jumping all around by calibrating the RC sticks. Let us know what works.
It's been 20-30 degree temps as well... was wondering if that plays into it
 
Joined
Jan 12, 2021
Messages
11
Reaction score
4
Age
40
Because you have modified the machine it adds many variables. I would first check all the mechanical linkages. Make sure none of the booms are loose or can rotate. Make sure the prop tips are aligned correctly.

Then calibrate all sensors. Ideally with your modifications in place as they could influence the results.

What was your satellite count when it was behaving badly?
 
Joined
Feb 27, 2019
Messages
2
Reaction score
0
Age
62
In the past few days my inspire has just been going nuts at lower levels. Soon after take off it is very spazzy lurching around stopping and starting. it seems to behave a bit better after I put the gear up but still isn't right. I had a shot yesterday where I had to hover about 30 ft above a bunch of parked cars and the drone just would not sit still in GPS mode. Even if I put it in Atti mode. At one point I was in tripod mode and that was working okay, when I took it out of tripod mode it immediately began spiraling around in about a 3 to 4-ft spiral. Not good When I bring it in for a landing it lurches around sometimes lurching two or three feet off to one side unexpectedly up and down and it typically ends up dropping itself the last 6-in. Today I will calibrate the IMU and see if that helps.
one other thing in the mix, you may have seen from one of my other posts that I have mounted the DJI air unit for FBV on this bird, but I was careful not to block any of the visual sensors underneath. I was theorizing that maybe the antennas were in the field of view of those sensors and were causing some problems, but even when I turn those sensors off I'm still having the same issues so I removed the air unit yesterday afternoon and did another flight and I think I may have had smoother results but it's hard to say. More testing today. Full IMU calibration as well as visual calibration and we'll see how we go from there.
I'm currently working on a TV show, so there's always a big crowd of production people standing around and it's either dangerous or simply embarrassing to have sketchy landings or to not be able to hold a steady shot when they want a nice up close beauty shot of a car that slowly pulls away and the drone is lurching around like a spaz.
Any other thoughts?
I have had the same issue. and it is a common one. Toilet bowl is what they call it. Cause is unknown to me. Sorry I don't have a fix for you but you are not alone.
 
Joined
Dec 5, 2019
Messages
70
Reaction score
24
Age
50
Because you have modified the machine it adds many variables. I would first check all the mechanical linkages. Make sure none of the booms are loose or can rotate. Make sure the prop tips are aligned correctly.

Then calibrate all sensors. Ideally with your modifications in place as they could influence the results.

What was your satellite count when it was behaving badly?
I didn't notice the satellite count, but I was outside in the wide open every time. I'll make note of it next time. Unfortunately it's snowing now and I can't go out and test things out. I will triple check all my linkages and everything.
Also, because I have added the DJI air unit and FPV to my Inspire I thought that maybe somehow that would possibly be causing interference or being visible to the sensors and freaking them out or something like that. So I removed that whole setup just in case. that was towards the end of day so I haven't gotten to really thoroughly test it out. But I had turned off all sensors and was still having exactly the same problem even with no sensors on, no landing lookout etc
 
Joined
Dec 10, 2018
Messages
39
Reaction score
16
Age
68
Location
Colorado
I didn't notice the satellite count, but I was outside in the wide open every time. I'll make note of it next time. Unfortunately it's snowing now and I can't go out and test things out. I will triple check all my linkages and everything.
Also, because I have added the DJI air unit and FPV to my Inspire I thought that maybe somehow that would possibly be causing interference or being visible to the sensors and freaking them out or something like that. So I removed that whole setup just in case. that was towards the end of day so I haven't gotten to really thoroughly test it out. But I had turned off all sensors and was still having exactly the same problem even with no sensors on, no landing lookout etc
Calibrate the RC Sticks.
 
Joined
Jun 28, 2016
Messages
1,577
Reaction score
708
Age
57
In the past few days my inspire has just been going nuts at lower levels. Soon after take off it is very spazzy lurching around stopping and starting. it seems to behave a bit better after I put the gear up but still isn't right. I had a shot yesterday where I had to hover about 30 ft above a bunch of parked cars and the drone just would not sit still in GPS mode. Even if I put it in Atti mode. At one point I was in tripod mode and that was working okay, when I took it out of tripod mode it immediately began spiraling around in about a 3 to 4-ft spiral. Not good When I bring it in for a landing it lurches around sometimes lurching two or three feet off to one side unexpectedly up and down and it typically ends up dropping itself the last 6-in. Today I will calibrate the IMU and see if that helps.
one other thing in the mix, you may have seen from one of my other posts that I have mounted the DJI air unit for FBV on this bird, but I was careful not to block any of the visual sensors underneath. I was theorizing that maybe the antennas were in the field of view of those sensors and were causing some problems, but even when I turn those sensors off I'm still having the same issues so I removed the air unit yesterday afternoon and did another flight and I think I may have had smoother results but it's hard to say. More testing today. Full IMU calibration as well as visual calibration and we'll see how we go from there.
I'm currently working on a TV show, so there's always a big crowd of production people standing around and it's either dangerous or simply embarrassing to have sketchy landings or to not be able to hold a steady shot when they want a nice up close beauty shot of a car that slowly pulls away and the drone is lurching around like a spaz.
Any other thoughts?
Turn off the VPS. If the problem persists, it's not the VPS.

D
 
Joined
Nov 22, 2019
Messages
27
Reaction score
6
Age
38
If I were you I’d start by removing the FPV module you’ve added. Why do you need that on the I2 anyway? I know the stock cam is very low res but you can control the tilt and for me that’s really important.
 
Joined
Nov 17, 2017
Messages
632
Reaction score
235
Location
Australia & Europe
Remove all add-ons, check all mechanical parts, linkages, arms for twisting, angles of motors by lining up prop tips against each other. If all good and sound, perform cold IMU calibration, compass calibration, stick calibration of your controller and VPS calibration. Then see if the problem persists. If yes, send the drone in for service.
 
Joined
Dec 5, 2019
Messages
70
Reaction score
24
Age
50
I've checked all linkages, prop alignment, every single thing I can find. Calibrated the IMU. Turned off all sensors. I've tried with them turned on and turned off. Used it on a few flights yesterday and had the same results. Extremely erratic behavior.
And this was in a completely different location than the other times. Out in the open with plenty of sky.
I pulled out my backup inspire and it flies perfectly.
I'm going to have to put it in for repair I guess for someone with more knowledge than me to figure out what's going on. What do you guys recommend for that?
 
Joined
Oct 10, 2020
Messages
14
Reaction score
6
Age
39
Location
Smithfield, VA
Website
aerialedgeva.com
Toilet Bowling can be dangerous. SOP at work is to switch into ATTI mode during toilet bowl and land. Keep an eye on GPS count. We are not allowed to takeoff with less then 10. We have lost a couple of birds due to toilet bowling so we are required to practice ATTI switch and recovery at long range.

Normally it has to do with either IMU or compass calibrations. Even if it says the compass is normal, when the bird starts to do it at lower heights we do a compass calibration.

I do not fly the I2 much, but it is the only bird that we do are testing with and training with ATTI mode recover at about 1200 feet. I own an I1 and it seems to wobble a bit more at lower altitudes. Compass cal works to tighten it up. Sounds like you might have a bit more then that going on.

May try an IMU cal, Calibrate the compass, then calibrate the RC and see if that helps. Its free and only takes a bit of your time.
 
  • Like
Reactions: Killboydotcom
Joined
Dec 5, 2019
Messages
70
Reaction score
24
Age
50
I did remove that. Didn't change anything. Hard to explain why I need that if you don't use your inspire the way I do... But when working with a camera app chasing cars on a show it's really good to be able to put on the goggles jump in the camera car and chase the car. I can just see a lot better where I'm going with an FPV system than I can on the screen. Removing the FPV system did not change anything for me
 
Joined
Dec 5, 2019
Messages
70
Reaction score
24
Age
50
Toilet Bowling can be dangerous. SOP at work is to switch into ATTI mode during toilet bowl and land. Keep an eye on GPS count. We are not allowed to takeoff with less then 10. We have lost a couple of birds due to toilet bowling so we are required to practice ATTI switch and recovery at long range.

Normally it has to do with either IMU or compass calibrations. Even if it says the compass is normal, when the bird starts to do it at lower heights we do a compass calibration.

I do not fly the I2 much, but it is the only bird that we do are testing with and training with ATTI mode recover at about 1200 feet. I own an I1 and it seems to wobble a bit more at lower altitudes. Compass cal works to tighten it up. Sounds like you might have a bit more then that going on.

May try an IMU cal, Calibrate the compass, then calibrate the RC and see if that helps. Its free and only takes a bit of your time.
it has only toilet bowls once. The rest of the time it's just doing crazy erratic moves randomly at different times and then flying normally for 10 seconds and then doing another crazy erratic move. It behaves the same in Atti mode
 
Joined
Jan 12, 2021
Messages
11
Reaction score
4
Age
40
At this point I’d pack it up and send it to Cerritos. My guess is an IMU fault or other flight control problem. Repair costs are extremely reasonable and the turn around times are quick.
 
Joined
Nov 17, 2017
Messages
632
Reaction score
235
Location
Australia & Europe
In the past few days my inspire has just been going nuts at lower levels. Soon after take off it is very spazzy lurching around stopping and starting. it seems to behave a bit better after I put the gear up but still isn't right. I had a shot yesterday where I had to hover about 30 ft above a bunch of parked cars and the drone just would not sit still in GPS mode. Even if I put it in Atti mode. At one point I was in tripod mode and that was working okay, when I took it out of tripod mode it immediately began spiraling around in about a 3 to 4-ft spiral. Not good When I bring it in for a landing it lurches around sometimes lurching two or three feet off to one side unexpectedly up and down and it typically ends up dropping itself the last 6-in. Today I will calibrate the IMU and see if that helps.
one other thing in the mix, you may have seen from one of my other posts that I have mounted the DJI air unit for FBV on this bird, but I was careful not to block any of the visual sensors underneath. I was theorizing that maybe the antennas were in the field of view of those sensors and were causing some problems, but even when I turn those sensors off I'm still having the same issues so I removed the air unit yesterday afternoon and did another flight and I think I may have had smoother results but it's hard to say. More testing today. Full IMU calibration as well as visual calibration and we'll see how we go from there.
I'm currently working on a TV show, so there's always a big crowd of production people standing around and it's either dangerous or simply embarrassing to have sketchy landings or to not be able to hold a steady shot when they want a nice up close beauty shot of a car that slowly pulls away and the drone is lurching around like a spaz.
Any other thoughts?
The toilet bowl behaviour points out to compass problem. Before you send it for repair I'd try one more thing. Perhaps too radical for most but in this case you have not much to loose. Remove the front cone of the craft body shell. It only requires to undo 4 screws. There lies the compass. Use a strong neodymium magnet to demagnetise the compass. Come close to the compass from front with the magnet and let it rest there for say a minute. Then slowly and gradually remove it into a distace of 3 feet. Repeat this 3 times. Then let your Inspire rest for an hour, perform the compass calibration dance on location where you experienced the problem before and see if it flies ok or better..
 
Last edited:
Joined
Dec 5, 2019
Messages
70
Reaction score
24
Age
50
At this point I’d pack it up and send it to Cerritos. My guess is an IMU fault or other flight control problem. Repair costs are extremely reasonable and the turn around times are quick.
When you say send it to Cerritos, is that DJI?
The toilet bowl behaviour points out to compass problem. Before you send it for repair I'd try one more thing. Perhaps too radical for most but in this case you have not much to loose. Remove the front cone of the craft body shell. It only requires to undo 4 screws. There lies the compass. Use a strong neodymium magnet to demagnetise the compass. Come close to the compass from front with the magnet and let it rest there for say a minute. Then slowly and gradually remove it into a distace of 3 feet. Repeat this 3 times. Then let your Inspire rest for an hour, perform the compass calibration dance on location where you experienced the problem before and see if it flies ok or better..
 
Joined
Dec 5, 2019
Messages
70
Reaction score
24
Age
50
At this point I’d pack it up and send it to Cerritos. My guess is an IMU fault or other flight control problem. Repair costs are extremely reasonable and the turn around times are quick.
I've sent her in... will report back with results
 

New Threads

Members online

Forum statistics

Threads
21,057
Messages
202,859
Members
30,642
Latest member
sisunman