Makeblock Airblock User Manual page 25

User Guide to Hovercraft Mode
Installation Step 4
After connecting power modules to the main control module, fit the
main control module onto the hovercraft hull.
Warning：
Port 1 faces forwards (the smaller end of the hull is the bow)
The main control module must be installed in the correct direction,
or it will not be able to control the direction of the hovercraft.
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