A laid out a 4 pitch prop to hand carve on a maple blank. The blank was 1/4" thick and 3/8" wide and I drew diagonal lines on the ends of the blank to establish the bottom of the airfoils. As close as I could tell, it was a 4 pitch. It ended up performing pretty good as a pusher on a speedy .049 project after scraping the blades so thin you could almost see light passing through them.