3 & 4 BLADED CONVERSION CHART
The conversion for a three and four bladed propeller is a simple tasked if you know what two bladed propeller you use on a given Engine. For example, on a three bladed propeller you would drop the diameter and keep the pitch. On a four bladed, you would drop the diameter and the pitch. For instance if you had a two bladed 24-10 propeller and you wanted a three bladed you would use a 22-10 and so on.
The performance on a 2 bladed verses a 3 bladed propeller is very little. A - 3 or 4 bladed propeller will give you more thrust, and you will sacrifice a little speed. The big advantage to using a multi blade is that you have more ground clearance less noise factor.