The direction they spin is printed right on the blade. Match that up to direction pointers on each of arms. Then secure them with the prop nuts they came with. a 12mm socket will help. The nuts are marked CW and CCW. You can also match the twist of the props to the factory props if you are not sure.himo said:Hi guys i just got a set of Tiger motor carbon props. I am unsure on how to install them. I have no idea which ones are clockwise which ones are counterclockwise? Do they just slip onto the motor and i use the nut to screw them on tight??