3DR ArduCopter Quad-C User Manual - Page 9

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Main Frame Assembly

1. Attach the bottom and top plates to one of the arm assemblies using an M3x30mm
screw (Blue) and an M3x25mm screw (Green), secure with two M3 metal nuts (Pink).
Note the four screws closer to the center of the vehicle are longer than those on the outside.
This 4 longer screws will be used to hold the PDB cap and stack-up assembly.
2. Repeat for the other three arms.
3. Attach four M3x08mm spacers as indicated in the figure above and fasten using four
M3x5mm nylon screws (Red).
4. Slide the velcro straps through the two slots on the bottom plate. The velcro straps
will be used to fasten the flight battery bellow the vehicle.
5. Slide four rubber washers (Orange) onto the M3x30mm screws (Blue) that stick out
of the top plate.