Hi all
Just to update this thread, I've finally had some time to give to my X8, but I'm still going nowhere fast
I've redone my calibration using this guide:
http://autoquad.org/wiki/wiki/autoquad- ... de/3352-2/The HUD is nice and level when on a level surface, ACCX and ACCY sit at 0, and ACCZ around -9.8. My magnetic vector magnitude is around 1.93, although on moving the vehicle to another position it went up to 2.11 ...
However if you look at this log file of a recent hop (the flight is the last thing in the log file - the rest is moving it around on the ground):
http://www.horizonimaging.co.uk/rcgroup ... es/7-6-14/and in the attachments, you'll see that:
• I've still got quite bad vibration (ACCZ for example goes to +- 4 ... ACCX and ACCY seem to go from -3 to +9 though!
). This is better than before as my props are all balanced now (almost all of them were OUT of balance before!)
• Why does the ACCX readout suddenly click to an average of around 0.92 at the 30 second mark (assuming those are seconds on the X axis?)
• The motor outputs are still horribly noisy (which I think is what caused one of the motors to 'cough' mid hover causing that side of the X8 to drop)
• The MAG values seem to be strongly affected by the running motors
I've run the motors up to almost take-off throttle with the X8 sitting on a bench, and the ACC values are much smaller, and the motor demands don't sound nearly so noisy / scratchy – it's only once I'm airborne that it sounds so nasty
Presumably I'm getting EMI on the magnetometer from the ESCs, all 8 of which are about 5cm from the AQ at their nearest corner. Should I try raising the AQ up further? It's currently on 15mm standoffs from the top chassis plate, directly underneath which are the ESCs. This is an old photo showing the AQ in the box I made for it:
It's not in its box at the moment, which has actually put it about 10mm closer to the chassis plate and the ESCs ... the ESCs live underneath the oval holes you can see in that photo.
I would say it's flying the smoothest it's flown so far, but it's still not at all useable, particularly with the nasty scratchy sounds coming from the motors – I'm sure that's not good for them, or the ESCs for that matter.
Any advice on how to proceed is much appreciated, I'm starting to get tired of this thing sitting on the bench all the time
Many thanks
David