I have been poking this build with a stick occasionally as I was working on my Power Wheels Rover project in the meantime. But now I am back to working on this quad.

Build list:

  • QAV500 frame
  • APM 2.5
  • SunnySky 2814-10 motors
  • Hobbymate 40A ESCs
  • Graupner E-Props 10x5

I have had a hard time getting this thing to play nice, and last night while reading more about ESC timing I realized that may have been my problem.  I was having occasional motor spurts, and sometimes one or two motors wouldn't spin up initially, they would pulse and behave strangely.  Early this morning I set the timing on the ESCs to low, and unsurprisingly it fixed the issues I was having.

I did a full config reset running 2.8.1, with motor size set for medium (0.110).  Flight is a LOT more stable than it has ever been, and had a slight breeze too.  All is left for me is to get more flight time, and practice, practice, practice!


More photos etc at: http://projectable.me/post/35643555854/more-tweaks-to-the-qav500-pl...

Views: 1744

Tags: 2.5, APM, QAV500

Comment by John Whitney on November 13, 2012 at 5:56pm
Nice build, I really like my qav500. Except today I got a little brave Doing a low pass over some woods across the field from my house. It caught the top of a tree and tumbled to the ground in multiple pieces. SD card flew out of gopro so I don't even have the video to watch. Also snapped an alum. Arm in half. Oh well, it's nothing money can't fix. Lol.

I'd like to see how you do with the altitude hold on this frame and fc. It works fine for me except in auto where it seems to slowly decend until it hits the ground. I can't figure that one out. Anyway, good luck
Comment by Simon on November 14, 2012 at 7:18am

Interesting to hear about your experience. I have a QAV500 as well. It has been okay so far except that it does not respond terribly quickly when increasing throttle to slow a descent. Very difficult to slow down in a descent. I was wondering about the ESC issue as well - although I haven't played around with throttle settings in Mission Planner yet. It is a beast as far as weight is concerned and wondering if default throttle settings may not be good enough. Other default PID settings appear to be sufficient at this stage (except for yaw - it does tend to overshoot. Again, weight/momentum maybe).

Comment by Daniel Chote on November 14, 2012 at 7:26am

Weight distribution is very strange with the QAV500 frame. I played a LOT with PID tuning, any variation just made things worse. And until I made the ESC motor timing change and 2.8.1 default settings I too had really bad forward/backward roll issues. 

Another thing I have found is that you MUST keep the weight as low as possible. I initially had the gopro inside its waterproof case, as well as the clean frame mounted slightly higher so the ESCs could fit between the 2 frames due to them being too large to fit where intended. This made the prop line about mid way on the clean frame and made it terribly unstable in any direction.  I have since flipped the dirty frame, ESCs are mounted on the underside now and everything is very close to original spec.

Comment by Josh Potter on November 23, 2012 at 3:46pm

How much does your model weigh flight ready?

Comment by Daniel Chote on November 23, 2012 at 3:47pm

it weighs a little under 2KGs

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