I believe to general rule of thumb is this, from a 2 blade to a three blade you go down in size 1 diameter ( 16/6 to a 15/6) and for the 4 blades you go down 2 diameters while keeping the same pitch. From a 16/6 to a 14/6 is what i have learnede over the years.


Hope this in for helps you out!

Art