Was flying next to a tree today and just underestimated distance and clipped a branch. Mavic fell from about 10 feet onto wooden deck and flipped over with motors still going. The props got destroyed - all four - but otherwise no visible damage at all to the craft or gimbal. I removed the broken props, powered everything up again, seems to be all ok. No errors, gimbal and cam working fine, motors working fine.

Should i do an IMU and gimbal calibration and should be ok or be more concerned about unseen damage?

Thanks

Replace the props then make sure your first few flights are in large very open space at very low altitude with the gimbal cover on. Take it easy at first then build up to speed & sharp maneuvers.

This way, if anything happens you'll be in a better position to recover from something unforeseen without being too concerned.

Yes, do the IMU calibration and then do the compass cal too.

Best to be safe than sorry

Rich

I agree with Rich, your aircraft fell from 10ft onto a hard surface and flipped over.
I would do a IMU, compass, and gimbal calibration.
I'm surprised your not getting any errors.
And even with the slightest prop strike you should discard them.As a percaution, I would send it in for evaluation. There could be some hidden internal damage.

DJI-Ken Posted at 2016-11-25 00:37
I agree with Rich, your aircraft fell from 10ft onto a hard surface and flipped over.
I would do a I ...

Ken,  

Are no errors popping up a reliable sign?  
I've had an inspire for years but this is first crash with anything so have always only had good experience. How likely is that if anything was wrong an error would actually show up?  

Is it something worth just sending in anyway?

Imu compass and gimbal calibration down without any problem.  

fans7a27e147 Posted at 2016-11-25 13:44
Ken,  

Are no errors popping up a reliable sign?  

Yes, with a fall from 10ft, just to be safe I would send it in.

Sorry to hear about your crash, hope it will be ok, that sort of thing can happen to any of us,good luck

Why you should do an IMU Cal..

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.