Quad Build Part 2

This post is quite a short one, covering the basics of the PCB (printed circuit board) based chassis plates and connecting the rotor arms to create the quadcopter’s familiar configuration.

The top and bottom members that hold the rotor arms in situ are multi-layer PCBs. This gives a combination of strength from their fibre glass construction and flexibility of electrical connectivity from the copper tracks that run between the fibre glass layers & their break out points on the chassis faces.

The main battery connector is attached to the bottom chassis plate as  shown below with the black wire soldered to the -ve pad and the red wire to the +ve pad (pretty basic stuff so far!). The beauty of the PCB chassis is that all the pads marked + are connected together, likewise those marked   . This makes connecting the main power feeds to the ESCs very simple as can be seen a little later on.

Main battery connection

As the battery connector will be routed towards the top chassis plate (when fitted) I thought it wise to add some strain relief on the soldered joints by applying a little hot melt glue.

Glue added as strain relief.

The assembled rotor arms from Part 1 are attached to the bottom plate using cap head bolts provided with the air frame kit (2 per arm) and the 2 ESC power feed wires soldered to the relevant pads on the PCB (as mentioned earlier). This leaves the orange control wire to the ESCs ready to be soldered to the FC later on. You’ll also notice I’ve numbered each arm to correspond with the diagram in Part 1 so I mount them in the correct location and use the correct rotor blade for each motor.

Rotor arms mounted to chassis.
Numbered rotor arms
ESC connections to bottom plate & orange speed control wires.