Hey Bolt,

Think of your prop as a transmission.

In real airplanes you hear folks speak of "climb" props and "cruise" props.

You guessed it, a climb prop has less pitch. It enables the plane to maitain a better rate of climb.

And a "cruise" prop has more pitch. They don't climb as good or accelerate as good, but they give you a higher cruise speed.

So a climb prop is like "low" gear. Less pitch give better acceleration and climb.

Cruise props are like high gear. And have more pitch.

If a plane is very streamline , it will actually fly well with a prop with very high pitch. The same prop and engine would be overloaded on a bluont and slow plane.

Aerobats like to go straight up and straight down. They use climb props, less pitch. And the prop can act as a brake on the down leg as well.

The charts listed above show a range. Just what you use in that range depends on your plane and your needs.

Often I will play around with 4 o5 props until I find the one with the best performance for a particular application. When it is right, the difference is more than just noticable.