Hi.
I have a problem after updating AC to 3.2.1 from 3.1.5.
When in Loiter, the the speed of the motors rev up and down/pulsate quite rapidly. This was working fine when I was using previous versions of arducopter.
I have downloaded the logs, and have looked into accX, accY and accZ. These seems to be inside the range specified in the wiki at arducopter. (Log_vibrations.bin)
Please have a look at the Log.bin, and note the difference between ThrIn and ThrOut when I'm in Loiter mode.
Anyone having any idea what the problem may be?
Replies
Thanks LTMNO for looking at my log. Been working on vibrations just had a test flight
and vibrations are better but AltHld still not good. This is my third build and never had this much problem. This frame looks like a TBS but is not TBS. APM 2.6 (frame type set to V)
810Kv 10x4.5 3 cell 3.2.1 FW PS: crash was just a tip over.
2015-04-19 13-06-24.log
It will be pretty hard to get rid of vibrations with 810kV + 10x4.5 + 3 cell.
I have 850kV motors + 4S and still rpm's are not high enough to keep vibrations in lower harmonics.
How much does your copter weight?
@Marko
Right now its about 4 Lb. I want to put gimbal and GoPro on board that will make it 4.5Lb.
All my other build are 1000Kv with same 10x4.5 and 3 cell. You might be right ! I was looking at 11x4.7 props (my ESC are only good to 3 cell) I do need to set Mid_Thr up some more I have it at 550 now needs to go to 600. I might have to rethink this build.
Thanks...............
Well, I got regular X with 850kV + 10x4.5 + 4s 3000mAh, loaded with gimbal + gopro2 + alexmos controller + separate camera and all telemtery + video stuff + separate FPV battery 800mAh. In total it's about 3.5 lbs.
I think yours it a bit overweight for loadout. Maybe you should take a bit lighter battery?
I use a 3300ma battery. So you have the same problem as everyone else here?
If so have you been able to find a fix ?
3.5lbs is very lite for that set up . The key must be 4 cell
Well, partially.
I got rid of most vibrations, but still performance of copter it not as good as on 3.1.5 firmware.
There was clue described in this article here, but I haven't tested it yet.
On the other hand, on tricopter (5x3 2900kv 800mAh) I have no such awful drift problem. Yes, it can change height if you intend to leave it hanging for some time (like about minute), but basically it flies well. I can not test "loiter" mode on it because it has no GPS, but "AltHold" is pretty good.
Key to good copter is in "coptercalc". ;)
Hello All,
after restoring the 3.1.5 firmware and setting the Throttle Accel to :
And I slightly decrease the Stab R/P to 3.5 for my 330 Hex Thorax Frame.
I am running APM Mini 2.7.2 with :
2300KV Tiger Motors
S12A ESC
5x4.5 HQ Props
External GPS/Compass
Everything is Calibrated and within Parameters...
Attached is Flight 1 with Default 3.1.5 Settings and the second Flight has modified Config as shown in picture above.
The Hex looks as follows,
This is my 7th, build and first time experiencing problems like this. That being said, I have noticed some interesting results with Battery Readings... if someone has a moment to have a look, it would be greatly appreciated.
Cheers!
Flight_1.log
Flight_2.log
Well, after doing about 10 flights today... tuning the APM manually, I can get a very stable Stabilize flight... very responsive... actually, the Loiter isn't that all bad either... just a little flutter up and down. The AltHold on the other hand is not behaving. I then proceeded to try a version even further down the chain. Hexa_ArduCopter_3.1.2.Hex and that had the same result. I don't think the problem is software/firmware. I believe we/I have a hardware problem. I don't know what it could be as my logs do indicate some Power Issues from more than 0.3v difference when in fact I get 0.429v delta.
I am going to start with my Power Module and then test again.
Here is the latest Logs... In case anyone is interested...
So, here are the results of a new PM put in place....
It seems to me, your power module just not have enough power.
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