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Motor / Propeller Problem

PostPosted: Wed Dec 02, 2015 5:39 pm
by Luxar
Hey !
Using someone the MN3508-20 Motors with 15x5.5 CF props ? I'll need some help/PID's Tuning templates...
After i change the Motor/Props the copter are very nervous. I'll tune various PID's, but nothing helping....
Am balancing the props And so on....
Can someone help ?

Re: Motor / Propeller Problem

PostPosted: Wed Dec 02, 2015 9:01 pm
by LPR
As usual to get help you have to first give much more information. We need a good photo, a parameter file, the type of ESC and it's setting.

The more you give the more you get.

Larry

Re: Motor / Propeller Problem

PostPosted: Wed Dec 02, 2015 11:46 pm
by afernan
Hi:

I think 15x5 props are too much for good effitiency performances of that motor. I´m using 12x4 and works great. I´ve tryed 13x4.5 and it´s not so good than 12x4. Have a look to this mount:
viewtopic.php?f=25&t=4631

Angel

Motor / Propeller Problem

PostPosted: Thu Dec 03, 2015 5:55 pm
by Luxar
Thanks for help :)
Am using the Motor / Prop combination with 3S 5000mah, esc32 v2, ready to Flight weight is 2280 gramms. The Motor have 580 KV
ImageImage

Re: Motor / Propeller Problem

PostPosted: Thu Dec 03, 2015 8:41 pm
by LPR
Ralf

You have a nice build but it takes quite a bit to get a quad to fly well using PID FW. Your props are probably ok because you have motors with a lower KV than Angels quad and you're using a 3s lipo.

Now it all comes down to seeing how much vibration you're getting on the SD card logs. Changing the PIDs setting and or changing your frame if vibration can not be lowered enough are the next steps.

Search the forum for other similar builds to find PID settings.

I attached an parameter file from an old build of mine that uses old FW and Simonk ESCs but it flies well. I would think you would be able to fly ok with these settings.

Larry

Motor / Propeller Problem

PostPosted: Fri Dec 04, 2015 4:43 am
by Luxar
Thanks for help/PID's example ! I'll Test it later, if am back from work :)
If the weather get better, or am in a sports gym, i will make a Short logfile and share it...

Re: Motor / Propeller Problem

PostPosted: Fri Dec 04, 2015 5:33 pm
by Luxar
Your PID's works good, i make a short Indoor logfile (hover on the floor, not good because some turbulences )
https://www.dropbox.com/s/z7hy8xsxp2gpj ... L.LOG?dl=0

Re: Motor / Propeller Problem

PostPosted: Fri Dec 04, 2015 5:53 pm
by LPR
Ralf

I'm surprised by how little vibrations you're getting.

Looks like you'll have a quad that should fly well.

Look carefully at the new PIDs settings I gave you and slowly change them to learn how to get the best performance out of your quad.

My quad is very different than yours so I'm sure you can do better with more PID tuning.

Larry

Motor / Propeller Problem

PostPosted: Fri Dec 04, 2015 6:18 pm
by Luxar
Sounds great! I think, am on a good way with vibrations And so on :) !
Hope, that I can fly tomorrow in the sports gym, to tune something. Thanks for helping

Re: Motor / Propeller Problem

PostPosted: Fri Dec 04, 2015 6:25 pm
by Luxar
Larry
Am using the esc32 v2....
Sometimes the motors wouldn't start direct, only on second try...my esc settings are on the pic in earlier posting...pls have a look on it