Just built tarot fy680 pro hex with pixhawk 620kv motors,40 amp linear esc’s,4s li-po. calibrated accels sucessfully,calibrated compass(spot on),calibrated radio,did compassmot.Flew in stabalise mode and flew good.Switched to either alt-hold or loiter and throtlle is not linear in either mode.In fact when I move throttle stick up theres very little change until I grt to about 70%.hen I cut throttle it starts to come down slowly and sometimes does not completely stop motos until I switch back to stabalise.
It’s called mid-throttle calibration o.k. now 