RE: What 3 Blade Prop to Use ?
Yes... as the engines get about .60 size you take off 1 inch pitcha and 1 inch dia to keep about the same load factor.
A scale effect of the larger props. The trade-off of pitch for dia also is right at 1 inch pitch for 1 inch dia at appx .30 to .46 size engines. The rule of thumb is off when you have a bigger or smaller engine.