Propeller Parts: Blades and Hub

Propeller Components

• A propeller consists of two primary components: blades and hub.
• Blades have various sub-parts that contribute to the efficient functioning of the propeller.

Blade Components

• Leading Edge: the cutting edge of the blade that faces forward when the propeller is spinning.
• Trailing Edge: the rear edge of the blade opposite the leading edge.
• Suction Face: the backside of the blade facing away from the direction of travel, pulling water into the propeller.
• Pressure Face: the front side of the blade pushing water out of the propeller, producing thrust.
• Root: the thicker base of the blade where it meets the hub.

Hub Components

• Shank: the thickened portion of the blade nearest the hub, also known as the root.
• Tip: the outermost point of the blade furthest from the hub.
• Blade Stations: reference lines marked on the propeller blade, usually measured in inches from the hub.
• Hollow Space: the space between the blades and the hub, allowing water to pass through freely.

Types of Propellers

• Propellers are classified as left-handed or right-handed based on the direction of water flow produced when the propeller rotates clockwise viewed from above.
• Left-hand propeller: rotates counterclockwise while spinning on the shaft.