Each set of propellers contains 2 [A] propellers and 2 [C] propellers. Because the motors spin in different directions, the propellers are designed differently to provide lift. If you lay the propellers on the table, the right blade of an [A] propeller will twist toward you, and the left blade will twist away. The right blade of a [C] propeller will twist away from you, and the left blade will twist toward you.

Steps to install propellers and propeller guards:

1. Identify each propeller as an [A] propeller or as a [C] propeller. The [A] propellers will be labeled with a small “A” underneath and/or a silver top.  

   
   

2. Lay each propeller next to its corresponding motor as shown in the image below.

   

   
   

3. Attach a propeller by sliding the propeller hub down the shaft of the corresponding motor. Make sure to press the center point in a gentle but firm manner to “snap” it into place.

   
   

4. Repeat Step 3 for each propeller.

   
   

5. Each propeller guard has a clip located at the end with 2 holes. Attach one propeller guard to each arm of the airframe, making sure the holes snap into the airframe's corresponding connections.

   

Propeller Orientation Test

To check if the propellers are properly installed, hold the drone from the side with the eyes of the drone facing to your right. Align the propellers so that the propellers are parallel to each other, but perpendicular to the airframe and top body panel. With the propellers aligned, look at the inboard blades (the blades closest to the drone body). The inboard blades should be sloped upward towards the drone body. If you imagine the blade slopes extending, the slopes of the blades should form a mountain or triangle.