Newbie In need of dire help

Good afternoon everyone

I'm here to ask for some help in this project of mine. Me and a group of friends have started trying to work with an hexacopter that has been built previously. This copter actually had a problem the first it was built which wasn't solved and can be seen on the video below.

Well first of all we're working with this copter, I'm having problems finding the model online since i think it has been discontinued:

https://www.youtube.com/watch?v=cmYZyozEekA&feature=youtu.be

We're using the Spektrum DX8 8Channel transmitter and the whole kit which came with this copter. So let me start with the problem numbering:

First of all: our ESC calibration process seems to be working erratically. Sometimes the process explained on the wiki seems to work, other times, for no apparent reason, it just doesn't and we can't get to the part where the hexacopter accepts that we've turned the throttle to the minimum and we're ready to try to give some powers to the motors.

What could explain the somewhat erratic situation where we are sometimes successful and sometimes we aren't? Can we actually do that as many times as we want and should we do the ESC calibration procedure everytime before lifting our hexacopter?

Even when we can actually pass the ESC calibration process, after testing the part of giving power to the motors, when we turn the hexacopter off and back on, no matter how much we put the throttle fully to the right (or left in that matter) we haven't been able to arm the copter. What could be the reason for this?


We've calibrated everything several times for this and, during the calibrations we've found something that is also puzzling us: on the mission planner, when we try to pick flight plan's for each channel of the RX8, no matter what box for each channel they are all out of options and flight plans, we don't have the chance of picking the Stabilize or Alt Hold nor anything like that, all channels are empty and we can't pick anything. What could be the reason for this?

1 last question and the less urgent one is: in the video I uploaded, as you can see, the hexacopter isn't stable at all. What I'd like to ask is: what could explain that flight pattern?

Thank you so much for any answer and I'm truly sorry if I'm just being a pain, We're all new in this sort of stuff and we're trying our best to learn everything we can about this subject as best we can and some of the wikis and information, even though they are very good, they suppose we have a bigger knowledge about RC than we actually do.

I'm sorry if my English is less then perfect and I'll be checking this post regularly hoping for some insight on our problems.

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  • Hello everyone! As I've promised I bring all the most recent news on our work.

    So, we've finally been able to put everything working, we were capable of arming, every calibration worked and we're all very happy with the results. So we started to flight test! These were the results:

    https://www.youtube.com/watch?v=z2BkLqdjVTg

    followed by:

    https://www.youtube.com/watch?v=5IwdiOG8Eo8

    We've already changed the broken propeller. What do you think we have wrong on our hexacopter to actually be doing that rotating movement? We've calibrated everything several times and we're using a Stabilize mode.

    I'm adding some photos for the connections we have:

    http://imageshack.us/photo/my-images/707/j942.jpg/

    http://imageshack.us/photo/my-images/542/7oj5.jpg/

    http://imageshack.us/photo/my-images/849/30vg.jpg/

    http://imageshack.us/photo/my-images/96/u5o6.jpg/

    http://imageshack.us/photo/my-images/812/qsl2.jpg/

    http://imageshack.us/photo/my-images/13/qjjd.jpg/

    http://imageshack.us/photo/my-images/29/p0no.jpg/

    Finally we had a strange last problem after we tried to make some new manual ESC calibrations to try and fix the problem and, unfortunately, instead of calibrating, one of the ESC's had this behaviour:

    https://www.youtube.com/watch?v=WH2uHD5x43s

    After that, we couldn't arm anymore, truth be told, we didn't try to actually arm it more then once, since we had ran out of time but I just wanted to find out why did it not let us manually calibrate this ESC in particular.

    I'd appreciate if you guys could help me one more time to try and make our copter fly properly.

    Best regards

  • Wow thank for all the feedback guys! The video I uploaded is a few months old, so the arducopter has already been repaired but the problem of it not flying correctly hasn't subsided.

    I'll check if the motor connections are actually correct and I'll check all of the proposed problems. We've been reading the manuals as much as possible but since we're all currently ending some other works (Personally I'm ending my masters degree on Physics Engineer) it might take some time before we get the full control of things. Still I thank you all very much for the feedback given and will try to update with more info as soon as possible!

    I'll post closer pics of the connections and everything as soon as I can reach the copter again, we have it stored on the perfect flight zone: a small building on an open field with internet connection in it and a lot of space for working. Again thank you so much for the info!

  • Here is a list I have compiled of problem fixes (based on final results from helping new friends like you):

    Reasons for multirotor flipping:

    1. RX --> APM input wiring incorrect (could be either and/or both ends incorrect - mixed commands)

    2. APM --> ESC wiring incorrect (mixed commands)

    3. If 3DR PDB, incorrect ESC plugged into assigned connectors (M1 in M2, M2 in M4, etc)

    4. Incorrect airframe type selected (Quad +/-, Hex +/-, Octo) when setting up with Mission Planner

    5. Motor directions incorrect (CW motor running CCW, etc)

    6. Incorrect propellers on motor (CW on CCW motor, etc)

    7. Propeller(s) upside down on correct motor

    8. TX stick movement reversed (one or more)

    9. Combinations of any and/or all the above

    As previously mentioned, you should start from the beginning to resolve this issue.

    It is certainly one or more of the problems listed above and perhaps another problem that will be added to the list! ;)

    Good luck and keep us informed.

    -=Doug

  • Can anyone answer atleast one of our problems? It would be a lot of help

  • If everyone could help out me and my work group would really appreciate it =)

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