Compare hub thickness with a commercially made 12 inch prop. If the hubs are the same thickness and its a wood prop... 99% chance its the same pitch.


There is a way to use trigonometry and by measring the angle of the blade at a given distance fromt he hub... you can figure the pitch. I forget the formula... but its nort hard to figure out. Use the circumference for the circle at the place you measured the angle as the base of a 90 deg triangle.