Your propeller is the unsung hero of boating. It’s probably the single most complex piece of engineering on the boat. The size and shape of the blades and their angle to the hub are just the start of the story.
The thickness of the blades, the rake and angle of attack at various points along its length, the finishing of the blade edge, whether or not it has any ‘cup’. These are all factors and there are many more. Change just one and the performance changes.
Two miles per hour; that’s what we lost when we accidentally backed out a little too far in a motor boat and at idle speed but in gear; our prop blades just kissed the edge of a rock.
Winter is a great time to remove your prop and have it checked out. Read more here.