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Permalink Reply by Christopher Cooper on April 11, 2011 at 12:58am

Ok, I may have jumped the gun a bit. I just checked my RX trim in the Configurator and it looks like my RX had forgotten it's trim settings. I guess this is something I should check before every flight!

I just flew it again and it looks like the yaw and altitude issues remain. It looks like the quad wants to yaw to a given heading, when I point it in another direction it returns to its previous heading.

Chris

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Permalink Reply by Sebastian Gralla on April 11, 2011 at 6:34am

can you check the magneto heading in flight? do you have Xbees?

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Permalink Reply by Brandon on April 23, 2011 at 11:40am

I'm having the same problem and I'm using ardupirates latest code. I calibrated my tx/rx in the Configurator and centered my trim settings. However when I'm done calibrating, the settings that I just set kind of get messed when I click save settings. Then I go to arm my motors and it goes full throttle into the ceiling breaking the arms on my frame. Any idea what mind have happened?

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Permalink Reply by Al Ros on April 24, 2011 at 8:11pm

could your transmitter have been in altitude or GPS hold position when you activated motors?

 

This happened to me but luckily my hand was over the quad centre and was able to stop it!

Al

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Permalink Reply by Choppy on April 24, 2011 at 11:34pm

I initially had problems wit the bullet connectors. Seems far away from the issue you seem to have however once hard wired together, I have had no problems with the stability (no more uncommanded death rolls!) I also mounted the boards between two layers of soft foam, maybe the vibrations were affecting the IMU's? Anyway, I think they  helped.

However, I too have the heading hold issue, I thought it was heading lock enabled? Anyway, I set my rudder rate way down low (50%) so I need full stick to yaw it with authority. just small tweeks left and right keeps heading and gives me time to respond. Also, some "pool noodle" foam skids help me sighting the front and back:) I fly in X form as I want to make a plane like  fusalage later. But for now, Im having fun getting stick time up, indoor flying helping out a lot. It helps with the confidence and now I use it to do parachue tests without the need of a plane or conventional heli. Just shoot it up high and release the chute and beat it to the ground for the next one. Small things amuse small minds:)

http://www.youtube.com/watch?v=-hxEV3ASAAY

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Permalink Reply by Christopher Cooper on April 26, 2011 at 3:46am

Thanks for all your responses. Most of the issues were probably caused by me. Turns out I was wrong when I said "I've verified that my RX is trimmed correctly and the accelerometers are initialised properly".
The transmitter trim values have a habit of changing, or simply no long being correct between flights. I've found it's a good idea to check the TX trims in the configurator before each flights.
Also, I was also mistaken when I thought I'd initialised the accelerometer offsets correctly. I initialised them with my quad sitting on it's landing gear, but it turns out my quad's gear isn't quite level. To get it perfectly leve I put blocks of equal height under each motor, so that the quad was resting on the blocks. Then I initialised the offsets. It's been flying pretty level since then.
I still have the yaw issues, but apparently things will be better in the next code release. Here's hoping.

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