Jimmyj
I don't know if the load factor that Red was talking about works or not but it was dia. squared X pitch so a 15x4 would have a load of 900 and a 10x6 would have aload of 600. 15x15=225x4=900 10x10=100x6=600 So they are not the same at all the 15x4 would place1/3 more load on the engine.