Propeller Adapters

The propeller adapters are what we will use to attach the propellers to the motors. In each motor box there are two adapters provided and it's important for us to determine which adapter to install on each motor.

As covered earlier in the previous section, motor rotation is of the utmost importance. Motors can spin in one of two directions:

• Clockwise (CW)

• Counterclockwise (CCW)

Previously we connected the ESCs to the servo rail in the necessary order. The image below shows the proper rotation of each motor/propeller. Motors 1 and 2 (blue) rotate in a CCW direction while Motors 3 and 4 (green) rotate in a CW direction.

Motors 1 & 2 = CCW rotation, Motors 3 & 4 = CW rotation

The prop adapters are right-hand and left-hand threaded and marked underneath with RH-6 and LH-6. The number 6 represents the diameter of the shaft in millimeters.

Each motor comes with a right hand (RH) and left hand (LH) prop adapter

For motors 1 & 2 we will mount the RH-6 adapter, which interfaces with CCW rotating propellers (silver cap). Motors 3 & 4 will use the LH-6 adapter, which interfaces with CW rotating propellers (black cap).

CW (black cap) and CCW (silver camp) propellers

Make sure the front of your VRC drone is oriented correctly before mounting! Double-check that it is consistent with the rotation diagram above as you look down on your drone.

Each prop adapter requires four screws for mounting. Each motor box contains several screws. Use the shorter screws with the button head as shown in the photo below.

Prop adapter mounting with button head screws

Do not overtighten as you do not want to risk stripping the head of the screw. Removing stripped screws is not fun and may even require the replacement of the motor.

Mount all four prop adapters and then add one of the provided aluminum washers on each of the four shafts. The washers come in a separate bag and are necessary to make sure the propeller is nicely seated on the adapter.

It is good practice to check the prop adapter screws before each flight. Simple pre-flight checks can prevent catastrophic failures while in the air.

Aluminum washer on prop adapter

The photo below shows the propeller nicely seated onto the prop adapter and aluminum washer.

Propeller and aluminum washer on prop adapter

Let's wrap up this section by mounting all four propellers and make sure we have them in the proper orientation.

All propellers mounted

The CCW rotating propellers have silver caps and are attached to motors 1 & 2. The CW rotating propellers have black caps and are attached to motors 3 & 4.

After verifying the correct orientation you should remove all propellers before moving onto the next section. While the drone assembly is complete, we still have some configuration to do before our initial flight test.

We want to reinforce the importance of keeping propellers off your VRC done while on the bench or performing maintenance. Only attach propellers when the area is clear and you are ready to fly.