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Appendix
Fix the TBE (Toilet Bowl Effect) Problem
When flying in GPS ATTI. Mode and the compass calibration has been done correctly, should you find the
aircraft rotating (Toilet bowl effect), or drifting when hovering. Please check the GPS module mounting
orientation and then re-do the compass calibration. Carry out the following procedure to re-mount the GPS
module.
In the following diagram (view from the top), the aircraft can appear to be rotating in both clockwise and
counter-clockwise direction, please re-mount the GPS module correspondingly.
is the rotating direction of aircraft,
is the nose direction of aircraft,
is the arrow direction on the GPS module,
θ
is the offset angle for GPS re-mounting(about 10~30
o
)
Clockwise rotating
GPS re-mounting
θ
Counter Clockwise rotating
GPS re-mounting
θ