Propellers convert engine horsepower into thrust by accelerating air and creating a low-pressure differential in front of the propeller. Since air naturally moves from high to low-pressure, you are pulled forward when your prop is spinning. But if the propeller isn’t spinning correctly, isn’t precisely balanced, or needs other maintenance or repairs, you won’t be pulled forward. And this is where it gets dangerous!
No need to be overwhelmed at all of the different types of propellers and options for your aircraft!
Today, there are many types of aircraft propellers available. The simplest of these propellers is either the fixed-pitch or the ground-adjustable propeller. More complicated propellers include controllable-pitch and complex constant-speed systems (automatic systems).