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There are three measurements you should always look at for propellers, though two is usually more important than the last. These measurements are length, pitch, and bore measurement. 

Length

The length of the propellers is usually given in inches. The higher the Kv and spin of your motors, the shorter your props have to be. Smaller props have faster speeds, better control, but less efficiency, leading to shorter flight times. Larger props, which are matched with low Kv motors, fly more steadily, requires less draw, and can lift more weight, but flies slower.

Prop Pitch

Pitch is measured as the distance the prop would move forward through a solid in a full, single revolution. The greater the pitch value, the more thrust and motor output you'll need. For multirotors and FPV racing, the pitch is typically within the 3 to 5" range. Lower pitches provide more efficiency, so longer flight times, but your flight characteristics will be much more tame.

Bore Measurement

Bore measurement is the size of the hole in the center of the prop. Adapters are usually available if you need to downsize the bore for your specific motor. If you're FPV racing, props have been normalized to a set measurement so you shouldn't worry too much about this measurement.

What Does This All Mean?

So with this information, what are you going to do with it? First off, figure out what kind of flying you want to be doing. Best way is to observe and research online. If you watch videos of guys flying with certain set-ups, see if that's what you want to do. Then you can test out those prop sizes and see what works for you. The flight characteristics between different prop lengths and different prop pitches do change quite drastically at times, so it helps to understand what you're getting into!

Thanks to Oscar Liang's Blog and Oscar Liang himself for allowing us to use his picture and article as reference. If you want to read his blog directly, click here. Click the Shop Now button below to see all of our propellers!