DJI WooKong-M - Manual (Page 26)

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FAQ
Fix the TBE (Toilet Bowl Effect) Problem
When flying in GPS 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
Counter Clockwise
rotating
GPS re-mounting
θ θ
Reinstall the GPS in an Offsetting Angle
Should you find the
multi-rotor does not track
straight in forward flight,
you might try
re-mounting GPS in an
offsetting angle as
showed in right figure. Θ
in the figure is the
offsetting angle.
Attitude Controllable When One Motor Output is Failed
For Hexa-rotor, including Hexa-rotor I, Hexa-rotor V, Hexa-rotor IY and Hexa-rotor Y, aircraft is attitude
controllable when one motor output is failed.
The WKM can still control the attitude of the Hexa-rotor for a safe landing when one motor output of the
Hexa-rotor has failed, for example, one motor is stopped or one propeller is broken, etc.
The control mode of WKM should be in Atti. Mode or GPS Mode. The aircraft will rotate, due to an imbalance of
torque; however, it can still be controlled by the Transmitter.
Objective flight direction
GPS mounting direction
GPS mounting dire
ction
Actual flight direction
Objective flight direction
Actual flig
ht directio
n
1 2 3
θ
θ
Without GPS offset angle
With GPS offset angle