IT'S A PROGRESSIVE PITCH PROP,CLOSE TO THE HUB IS 6" OF FORWARD TRAVEL PER EACH TURN OF THE PROP,CLOSER TO THE ENDS THE PITCH CHANGES SO THERE IS 10" OF TRAVEL PER EACH TURN, THE THEROPY IS SIMILAR TO AN AUTOMATIC TRANSMISSION,LOW SPEED THE 6 IS THRUST,HIGH SPEED THE 10 IS FOR SPEED,SOME LIKE THEM SOME DON'T.
HAVE A GOODUN,JOHN.