Hi,

I noticed that when flying forward its not in a straight line.  At first I thought it was me, but after paying closer attention to my stick movements I realised it wasnt me.

Has anyone else noticed this.  Is there anything I can do to try and resolve this.

I have been searching but cannot seem to find anything that relates to my issue.

Thanks in advance for any suggestion..

John

P-mode, right?  I had mine drift WITH the wind slightly with higher winds.  It's like it didn't add enough correction angle in, but enough to notice it was trying.  It should have had no problem.  It was a consistent drift, however.  


Not to belittle you, but you HAVE noticed that the sticks are not straight up/down, right?  Instead of being perpindicular to the R/C, they are angled outward slightly  -  I hate this.

I had the same problem in my first flight.  Haven't had a chance to try again.  It was a little windy, but not extremely so.  But definitely had a drift that was ruining my shots.  I would be curious to know if anyone else has had this as well.

Hi,  Thank you both for your replies.    At first I thought it might have been me not pushing straight up or down which is why I then took more care when pushing forward and noticed that I was still drifting.

There was no wind yesterday or certainly not enough to cause the drifting I was seeing.   

I did find a post and someone had the same issue and they calibrated the IMU and will do a compass calibration when I fly next hopefully today

Bit more understanding about drifting and IMU..
IMU "Inertial measurement unit"
This was not written by me , but was an answer to a question I posed.
As far as I see it, IMU calibration on a level surface updates a table of values the flight controller software uses as a reference for a level stationary hover. From there the craft responds predictably to flight commands.  It also likely measures any sensor noise and thermal drift so that these technical imperfections are accounted for when using IMU sensor data in flight. - this is likely why there must be no vibrations during the calibration process.


Bad IMU calibration could cause drift and attitude issues as the flight controller fights to hold the craft in what it thinks is the correct attitude as opposed to the correct physical attitude.


The IMU usually has 2 types of sensors – angle and acceleration and in turn 3 sensors of each type measuring in the X,Y and Z axis. These sensors can, through vibration, aging, impact etc, drift in their response over time and thus an IMU calibration will establish a new reference for the IMU’s level/stationary state that the flight controller can work with to restore stable flight.


Think of calibration as the bringing back into line the measured craft attitude with the true physical craft attitude.


As to how often an IMU calibration is needed, I wouldn’t like to say; certainly after any impact or if there are suspicions the craft can’t hover in a level attitude in a windless environment. Also after a firmware update is a good opportunity just in case the stored values get corrupted or are incompatible with the later firmware.

I did put this piece together because at least 1 person seemed to have a problem, I think Bad IMU.

Its also good to mention that the IMU is the reason why you are able to shut off the motors using just the throttle down command when on the ground. The IMU reads that the aircraft is unable to move any further, and after three seconds it determines that is has officially landed and can shut off the motors safely.

I've seen situations where if the compass is not calibrated the drone will not fly in a direct straight line.  I know this is a little "Captain Obvious" but do try a fresh compass calibration and see if that clears it up.

Please try a IMU calibration and compass calibration. And keep us posted.