Aardvark
Captain
Flight distance : 384432 ft
United Kingdom
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fans251837f1 Posted at 2018-2-8 12:14
Thanks, what do you mean about not having time to react. Does Rth need you to do anything other than wait for it to return home and guide it down. Sorry if I sound thick!
One situation that some have come across is flying in the garden, they hit RTH and the aircraft lands in the swimming pool, duck pond or whatever bush or tree happens to be in the way. So the information here is that if you initiate RTH within 20m (65 feet) of homepoint, the aircraft will land, that's it. But if you realise your mistake you can stop the descent and steer it to a safe landing zone using the RC.
RTH is not failsafe and needs some understanding to avoid accidents.
Regarding updates, the latest 02.00.0700 P4 firmware appears to be good and has fixed the problems with last Julys 02.00.0106 release which caused problems for a significant number of people.
As it's new I would also consider a full calibration:-
There are five calibrations on the P4:-
1) Sensors (Using DJI Assistant 2 v1.2.0, or latest version), usually done just after update on Assistant 2.
2) IMU (level surface, make sure it's had time to cool down if it's been powered up, say half an hour at lowest ambient temperature, a cool evening or air conditioned room below 10 degrees C helps).
Using the newer '3D' IMU calibration routine, my last two IMU calibrations have been done at about 20C ambient air temperature. The subsequent IMU warm up time when aircraft is first powered up and initialising does not seem to have been adversely affected, and warm up time is a few seconds at most.
3) Gimbal (just after IMU).
4) RC sticks (with aircraft off).
5) And compass (in an open area (not over steel reinforced concrete), away from ferrous materials or electromagnetic interference). Get one good calibration, and that should be all that is needed until informed by system or erratic flying that needs investigation. Note that any ferrous metals very close to legs (steel frame in desk, cutlery in kitchen drawer, windowsill strengthening etc) will generate a 'compass error', this does not mean compass needs recalibration. just move the aircraft away from source of interference.
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