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Near to give up

Posted by giu on July 13, 2011 at 7:08am

After many crashes, after short circuits and a new APM, after new propellers, after new motors, and after having spent money, I think that AC2 is quite difficult to setup.

Here, it is a video of my new build: everything new. All configuration done correctly via Mission Planner. PIDs ad by default.

Throttle 40%--> oscillating and crash.

Any help will be really appreciated

 

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Replies

  • giu October 16, 2011 at 2:36am

    I changed the mounting of motors. I checked the level with a level meter. All is fine. Looks at the photos.

    But the behavior is the same. I think the motors are  not spinning anew at the same speed. And this convince me that 

    the motors should be protected against particles which can enter inside the bell. This behavior re-happened after a crash in my garden, where there are a lot of plants and dust.

    Any help will be appreciated.

    https://www.youtube.com/watch?v=tFW82bE9l2E

     

     

     

     

     

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  • Moderator
    Hai Tran October 15, 2011 at 7:28am

    LoL I've given up (for now, waiting for the software to get to that next level)

  • giu October 15, 2011 at 7:05am

    Is there anything wrong with this arms or motors?

    Regards

    3692286671?profile=original3692286784?profile=original3692286883?profile=original

  • giu October 15, 2011 at 7:00am

    Again the tilting problem at take off.

    I changed everyghing. And the quad flew fine, very fine. But a little crash and again I have the tilting phenomenon. When take off, it tilts vigorously on one side. I checked the positions of motors, and they are correct. It is very stressful.

    I do not know if I am the only one having such problems, or if they are inherent to AC2.

    Regards

    https://www.youtube.com/watch?v=A49SHlw5iXI

     

  • Mago October 13, 2011 at 10:03am

    i had similar issues, then realized i had motor connectors swapped or wrong places (eg. motor 2 in place of 4 etc) .

    Set the right order, my quad went fine with all default pids etc.

    check carefully motor esc connectors order, then do a "hands on" test or build a simple test bench which can suspend copter and let it rotate a bit to check everything is fine.

    You will suceed or, at least, discover where the problem is.

  • giu August 27, 2011 at 5:01am

    NOW IT FLIES correctly!

    After rebuilding new frames (10x10x2mm), the quad takes off more smoothly. The tilting effect seems to be gone.

    Thanks to emile's suggestions and his patience now I have more hope to use this vehicle.

    One important thing is that the legacy AC2 frame is not good. Too fragile, especially the arms, which are too thin. After a simple light crash they blend like a gum. I would buy the new frames for AC2 from diydrones store, but I had not money to spend, therefore I built it by myself, just changing the arms.

    Moreover, forget the landing gear from Hobby King (that one you can see in the video). Is to high and the base is to small (the center of gravity goes outside the base very easily and this cause the hard take off problem).

    Another important thing I never checked is the level. Or rather, I always assumed that my previous quad was level and actually it was not. So, I levelized the IMU+APM board, by taking it off the quad and putting it on a desk, then, after level procedure, I put back the boards on their place in the quad.

    Now, I have two questions

    1) The quad now is a little bit heavier. And with 60% throttle it does not go up more than 3 meters. My batteries are second hand  batteries, One is 5000mAh, but I suspect that some cell is broken because after 1 min of flying the max altitude I can reach decrease.

    2) 2200mAh are enough to carry a camera gear?

    Regards and thanks to all

  • giu August 21, 2011 at 11:28pm

    I think that the problem I have been having can be caused by the different length of the axis of the motors.

    Two are from jDrones and 2 are from udrones. It is a matter of mm, as you can see in the picture, but maybe that causes the tilt and the drift.

    The first photo is a motor from udrones. The second one from jDrones. The last photo is a comparison of two motors. There is 1 mm of difference but when a put the prop fixer, the difference is evidente.

    Can this difference be the problem?

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  • CyberCrash August 21, 2011 at 7:59am

    Where do you live?

     

    I am in Germany. Maybe I can have a look on your copter. "Sometimes one cannot see the wood for the trees".

     

    ;-)

  • CyberCrash August 21, 2011 at 6:45am

    Just hold the copter in your hand and try to feel in which direction the copter wants to go. In your second video it's hard to see .

     

    My guess after seeing your first video: Your ESCs are connected in a wrong order. If not that the props are turning the wrong way.

    My first attempt looked the same, but I could hold on to my copter. But it nearly hit my arm while turning vertical.

     

    And check that your APM is looking to the front....so connectors to the back. Please post a short video to show the installed props and the way they are turning and where you connected everything.

     

    I had my third flight today and everything is working just perfectly. So I guess there is a wrong cable somewhere.

  • giu August 21, 2011 at 3:18am

    I just mounted 2 new ESC. Now I have all ESC from jDrones.

    The result is the same. The copter tilts forward.It is not a matter of center of gravity: I tried to move back the battery in order to change the center of gravity. Same effect.

    I am stucked.

     

    forward.it
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