Flight Data; Propeller - Zerotech DOBBY User Manual

The optic flow and ultrasonic positioning system may not work under these circumstances,
please use with caution:

Above highly reflective surfaces;

Above water or transparent objects;

Above people or moving objects;

In areas with rapidly changing/flashing lights;

Above very bright or very dark surfaces;

Above objects that easily absorb ultrasonic waves;

Above surfaces without clear textures or with too sparse or too dense textures;

During fast flight at low levels (0.5m or less), the optic flow and ultrasonic positioning
system may not work.

Ensure that the lens of the optic flow camera is clear.

Because the ultrasonic positioning system may be disturbed by ultrasonic waves
emitted by other ultrasonic equipment, please do not use DOBBY near other ultrasonic
equipment, including other drones.

The Ultrasonic Sensor will emit ultrasonic waves that are inaudible to humans but may
make some animals nervous. Please do not use DOBBY close to animals.

Flight Data

DOBBY will begin to record flight data from the moment you turn it on. It will stop recording the data once
the power source is turned off. The name of the file will be the time when the data was recorded.
When you use the fault report function in the app, flight data will be automatically uploaded to the server,
so as to help with fault diagnosis.

Propeller

DOBBY has 4 sets of 3-inch foldable Propellers. The propeller blades are already mounted; users only
need to expand the Arms before flight. When you're done flying, fold the Arms and the blades into the
base of the aircraft to prevent damaging them
The blades have either "A" or "B" on the top to indicate in which direction they spin, as shown in the
following figure:
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