Investment Cast Propeller Terminology

Propeller Terms to Know


The linear distance that a propeller would travel in one revolution without slippage. Quality Castings offers both square pitch (pitch = diameter) and super pitch (pitch = 1.5 X diameter) MP series propellers.

Propeller Pitch


A propeller can be either left- or right-hand rotation, both of which can be operated in clockwise or counter clockwise directions. The hand of the propeller and direction of rotation will define the direction of the fluid, which is being moved by the propeller.

Custom propeller rotation

Pitch Face

The pitch face is the flatter of the two blade surfaces (see diagram above.) Always mount propeller with pitch face in the same direction as the moving liquid.

Propeller pitch face is the flat side of a blade surface


The fore or aft slant of a blade with respect to a line perpendicular to the propeller axis of rotation.

High propeller rake on boat for increased speed


The transverse sweeping of a blade such that viewing the blades from fore or aft shows an asymetrical shape.

Skewed propeller with sweeping motion


Small radius of curvature located on the trailing edge of the blade.

Propeller cup is the curve of the blade for mobility


This small component controls the flow of liquid, gas, or fluids by an opening or closing motion. Constant-speed propellers are partially controlled by a pilot valve in order to maintain continual motion.

Propeller valves regulate oil flow for heavy-duty aircraft


A rotating component that is made to increase or decrease fluid flow and air pressure. Compressors, medical devices, mixer tanks, and even household machines have impellers that serve as the main operator.

Impeller Casting Wisconsin


A rotating device that takes energy from element flow and converts it into power. Gas, water, and steam turbines are some of the more popular types of turbines.

Propeller Turbine Casting Wisconsin


A device that blends or mixes all types of industrial materials, including food, mineral, and medicinal purposes. Mixers come in all shapes and sizes, depending on the job at hand.

Propeller Mixer Casting Wisconsin

Bearing Housing

Also known as a pillow block or plummer block; which gives support to rotating component. A bearing housing is typically made of iron or steel.

Bearing Housing Casting Wisconsin

Drive Shaft

A part that delivers a rotation or twisting of other connected components, including a propeller; reaching a common goal. The drive shaft must have a lot of strength to endure stressed force.

Propeller Drive Shaft Casting Wisconsin


The part of a machine that rotates to power engines, blades, antennas, cranks, and more. A rotor encompasses dozens of industries, including chemistry, aeronautics, marine, and electric.

Propeller Rotor Casting Wisconsin


The center of a propeller that is connected directly to the drive shaft. A hub is typically made of either plastic or rubber.

Propeller Hub Casting Wisconsin


A term used for the difference of blade height compared to the others. The distribution between each blade depends on the targeted goal of mixing, blending, etc.

Propeller Blade Tracking Wisconsin


Air or gas is drawn into the propeller blades; resulting in lost speed as the propeller loses its grip with whatever it’s powering.

Propeller Ventilation Wisconsin


Type of damage done to propeller blade tips from collapsed bubbles. These bubbles are created from the negative pressure of torque and thrust; similar to opening a bottle of champagne.

Propeller Cavitation Wisconsin


A forward motion created by the movement of a propeller.

Propeller Thrust


A type of force that twists a component, causing the actual rotation.

Propeller Torque


A component that supports the propeller, shaft, and bearing. It must be strong enough to bear the weight load, as well as minimize vibrations.

Propeller Torque


The term means “revolutions per minute”, which is the rotational speed of a certain component. RPM is measured by a tachometer, keeping track of the amount of rotations in a motor or machine.

Propeller RPM

Blade Back

The forward, or suction side of the blade.

Propeller Blade Back

Blade Number

Number of blades on a propeller.

Propeller Blade Numbers

Blade Root

The area where the blade is attached to the hub.

Propeller Blade Root

Blade Face

The pressure, or pitch side of the propeller.

Propeller Blade Face

Blade Tip

The maximum reach of the blade from the center of the hub.

Propeller Blade Tip


The curvature in the mean thickness line of the blade.

Propeller Blade Camber

Stern Drive

A type of propulsion system, using the power of the inboard with the outboard drive.

stern drives, outboard and inboard engines

Prop Slip

The difference between the theoretical distance(pitch) and the actual distance of the propeller after drag.

prop slip, propeller info, castings

Angle of Attack

The angle at which a body mass and the passing flow come together to produce lift in the air.

Propeller blade angle of attack, propeller terminology

Hole Shot

The rapid acceleration of a boat, from resting point or slower-speed, at which the engine and propellers work the hardest.

Propeller & engine hole shot, propeller terminology


Point at which the blades rotate directly parallel to the airflow. This is done to reduce drag and increase gliding distance.

Feathering, propeller terminology
Contact the propeller casting professionals at R2 Quality Castings today for more information on our precision investment casting services.