HarryT said:
It's a mystery to me why the OP didn't take over control when it became obvious that it was going wrong.
Probably because they failed to read the manual and had no idea they
could recover control.
Either way, never seen anything like that action. That's pretty bizarre. Rebar in the concrete seems like an iffy cause, to me. a) I've only known rebar to affect the compass. I could see where it
might affect GPS under very rare circumstances. But this clearly is not a compass or GPS issue... it's looks to be a problem with the barometer. And a barometer just ain't gonna be affected by rebar, it's mechanical not electrical. And b) if this is, indeed, RTH, than the pilot more than likely took off from this same exact spot... and probably would've noticed odd behavior then, too, if the interference was so strong as to cause what we see in the video.