hallmark007
 Captain
Flight distance : 8627812 ft
Ireland
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Sato Zoom 2 Posted at 2018-10-31 06:14
Hallmark let me pick your brain if I can........
I often take off from a convenient area of a park that is paved asphalt (no rebar, zero compass interference). However, the area is not level. It's not terribly slanted I'd guess maybe no more than a 20 degree decline but definitely a noticeable unevenness. My M2 seems to launch and fly fine from there. Do you think launching from an uneven position could mess with the IMU somehow by starting unevenly then suddenly jumping to level flight? Do you see any danger in launching this way?
No I have often looked for a slight slant in the ground, simply because Mavic camera is so low to the ground. Technically yes the IMU has to work slightly harder to find correct attitude, but IMU in these aircraft are well capable, I always use test below both to check compass and IMU etc before taking off to the sky.
Tip To Help Avoid compass interference and crash.
1/ Never calibrate Compass unless prompted to.
2/ start AC leave until you receive enough gps lock ,
3/ if you get Compass interference turn off AC and move to another location,
without interference.
4/ In bottom left hand corner on your map you will see small red triangle, check to make sure that this triangle is pointing in the same direction (heading) as your AC, this will show good compass on the ground.
Raise AC to height of 8ft
Hover for 20 seconds
Fly forward 2ft
Backward 2ft
Left 2ft
Right 2ft
Up 2ft
Down 2ft
Yaw left
Yaw right
Each time returning to hover position
If you have a good horizontal each time, you will then know you have good GPS good IMU and good Compass, and your ready to fly.
This exercise takes less than 2 minutes and is worthwhile doing before every flight,
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