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Custom Autopilot development - Theory through Implementation

Started by Wil Selby. Last reply by Stone1295 on Tuesday. 2 Replies

I started this project wanting to learn more about the ArduCopter software that was powering my APM board and 3DR Quad-C frame. I found …Continue

Tags: equations of motion, MATLAB, autopilot, Control System, ArduCopter

GPS err in altitude vs. flying a drone at low altitute 3 mts

Started by Darius Jack on Monday. 0 Replies

Hi,I would like to study GPS err in altitude,since Cala suggested problems flying a drone at 3 mts altitude in agriculture.Laser Developer offers Lidar technology solution.Let me know your  opinion…Continue

Motor spin slow than others

Started by Cristian Rougier. Last reply by Khoa Vu on Monday. 19 Replies

Hello, all , im working with APM 2.5, in X configuration, when i arm the APM, one motor (motor 4) spin slow than others 3.When i calibrate the ESC's in automatic mode, all spin with same speed and…Continue

Noob APM/PixHawk RC transmitter coming soon to HobbyKing

Started by Tony Kenward. Last reply by Khoa Vu on Monday. 3 Replies

I am not interested in purchasing one of these, but I thought y'all may be interested. [Chinglish description text spell-corrected and posted below]--------------------------------------The Quanum i8…Continue

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Comment by Larry A Amati on October 18, 2015 at 5:26am

I have been a member of this forum for about a year and a half.I like a lot of You have posted problems about our drones.What I have discovered is that many of our issues are our own creation.I have learned to pay close attention to details like balancing motors,props etc.Triple checking motor direction and correct prop (ccw,cw).Also really understanding things like esc calibration,radio calibration.The best advise I would give is to understand the wiki and before you arm your drone check everything again.We should all thank the developers  for putting up with some of our questions on the support forum.Happy flying!

Comment by James Lummel on October 10, 2015 at 10:33am

If you are having problems with  v3.2.1 on APM 2.x hardware and your multirotor is unstable and won't sit still but worked fine with v3.1.5 or v3.2, try changing the parameter INS_MPU6K_FILTER to 20 or 42 rather than the default of 0. The value of 20 is preferred for an APM 2.x flight controller.

As I understand it, the value of 0 used to default to 20 in earlier firmware but is now an absolute value. Changing this param cured the problem I had with 3.2.1 on a Cheerson CX-20 and it now flies smoothly with the final firmware released for APM 2.x. I'm really liking the PosHold mode!

Comment by Kautilya Vemulapalli on September 30, 2015 at 5:00am

@Darius Jack,

I do find it annoying too since you might not have the last setup you used available on your current test. They might do it if they hear from too many people for them to turn that option off.

Comment by Darius Jack on September 30, 2015 at 4:57am

Can we ask developer of eCalc to disable

random fooling option ?

it will keep changing the options you see at random every time you open eCalc.

Comment by Kautilya Vemulapalli on September 29, 2015 at 9:23pm

@estebanflyer, You need to get the paid account to get access to all options. If not, it will keep changing the options you see at random every time you open eCalc.

Comment by estebanflyer on September 29, 2015 at 3:48pm

Does anybody know why Ecalc is showing different motor types on different ocassions? I opened four tabs and in each case the RCTimer motor selections showed different numbers:

Comment by Khoa Vu on September 26, 2015 at 4:04pm

@ Ken, haaha I didn't see Jame's reply before I wrote on your wall. 

Comment by Ken Costigan on September 25, 2015 at 6:26pm

Thanks for the feedback James, I really appreciate it.

Comment by James Lummel on September 25, 2015 at 4:17pm

@Ken Costigan are those ESC to motor bullet connectors bare like it looks in the photo, or are they covered some something like clear heatshrink that you just can't see? If there is bare metal then that's what's causing the crashes!!

During operation of the motor there would be enough vibration during flight that the bare metal would momentarily touch, especially during changes in direction at speed. Every time they touch that motor would stop briefly, and if that happened to two or more motors at a time OR any single motor were stopped long enough, down she comes!! Pretty much you are guaranteed a crash flying like that...

Get some heatshrink on all of the bullet connectors going from the ESC to the motors and see if that makes it fly better. It may not be the only problem you have, but it certainly is a show stopper and needs to be fixed before your next flight.

Comment by Ken Costigan on September 25, 2015 at 2:55pm

Howdy all,

I'm on my second rebuild of a hexcopter and I just had my second crash. I'm completely stumped what happened. I've attached the flight log, my list of parts and a picture of what I think is the culprit. 

Any suggestions advice is greatly appreciated.


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