AS9120B, ISO 9001:2015, AND FAA AC 0056B ACCREDITED

What Are the Basic Propeller Parts and Terms Pilots Should Know?

While aircraft with propeller assemblies have long been superseded by gas turbine engines in terms of performance and capability, there are still many single-engine, light aircraft that feature such assemblies. As a moving assembly that is often subjected to intensive atmospheric conditions and wear, it is important that one enacts regular maintenance to prevent costly breakdowns or performance losses. For any pilot with an aircraft featuring a propeller, one of the easiest things you can do to better care for your assembly is to understand the basic components that make it up. As such, we will provide a brief overview of the most common propeller parts and terminology, ensuring that you have the knowledge you need to keep your aircraft airworthy.

One of the first things that a pilot should do is to familiarize themselves with propeller assemblies and learn to recognize the various major components that make them up. While some propellers may vary from one another to a certain degree, most feature common parts like the hub, blade, pitch change mechanism, feathering springs, counterweights, spinner, and spinner bulkhead. The hub is the primary housing that connects with the output shaft, and most other elements like the blades are attached to this assembly as well. The amount of blades on a propeller assembly can range from two to seven blades, and they are held in place by the hub and consist of a blade tip, blade face, blade back, and blade root.

During typical flight operations, the engine will generate power that is transferred to the blade assembly through an output or crankshaft. With the pitch change mechanism, any hydraulic energy is transformed into mechanical motion that permits the blade assemblies to spin. While some propeller blades may be unable to feather, those that do will feature feathering springs that force blades into a high pitch as necessary. To assist this endeavor, counterweights are commonly implemented to ensure a high pitch or feather angle when oil pressure drops.

The final two common propeller components are the spinner and spinner bulkhead, both of which perform a similar role. The spinner itself is a dome placed over the propeller hub, ensuring that it has an aerodynamic cover for the means of increasing cooling and streamlining. Meanwhile, the spinner bulkhead serves as the connection between the spinner and propeller assembly, guarding components like the hub and pitch change mechanism from various stressors or environmental conditions.

Alongside having an understanding of the common types of parts that are present within a propeller assembly, it can also be beneficial to be aware of common terms used with such parts. For example, it can be very useful to understand the difference between a fixed pitch propeller, variable pitch propeller, and constant speed propeller, as each are different types that vary in the ability for the propeller angle to be changed. For example, fixed pitch propellers are non-changeable during flight, while a constant speed propeller will automatically adjust pitch to maintain a particular RPM. Additionally, being familiar with what feathering, thrust, and blade twist is can also be very useful.

If you own and operate an aircraft and find yourself in need of various propeller parts like diffuser ring parts, ribs, exhaust passage components, or other such items, let the experts at Stacked Hardware help you secure competitive pricing and rapid lead-times for your benefit. Fully dedicated to quality, we explore every avenue to consistently improve our inspections, services, and export compliance. As a result of our steadfast dedication, we proudly operate with AS9120B, ISO 9001:2015, and FAA AC 00-56B accreditation. To get started on the purchasing process, give us a call, email, or take advantage of our RFQ services and a dedicated account manager would be happy to assist you however needed!



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