We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is a Fan Disk?

By Paul Scott
Updated May 23, 2024
Our promise to you
WikiMotors is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At WikiMotors, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

A fan disk is the part of a turbofan jet engine that secures the bypass fan assembly and connects it to the low pressure compressor and turbine via the low pressure shaft. The fan disk is one of the critical parts of any turbofan engine and serves several vital functions. The most important of these is securing the blades of the primary or bypass fan. The disk also serves to connect the bypass fan to the low pressure shaft which is, in turn, connected to the rest of the low pressure components of the engine. All peripheral fan components such as the nose cone or spinner are also supported by the fan disk.

Modern turbofan jet engines consist of two basic sections: low and high pressure. These both consist of compressor and turbine components. The low pressure section has one additional part that is possibly the most important part of all. This is the bypass fan which is the large, multi-bladed fan so prominently visible when a jet engine is viewed straight on. This fan is one of the most critical parts of the engine and a major contributor to the engine's thrust capacity.

As large and impressive as this fan may be, its most important single component is fairly small and rarely, if ever, seen. This is a rather unassuming looking hub at the center of the fan blade assembly. Known as the fan disk, this part of the bypass fan serves several vital functions in the overall operation of the engine.

The first is the critical task of supporting the huge fan blades.These blades are subject to intense mechanical stresses during operation; as the most exposed part of the engine, they are often subjected to impact from foreign objects.These unforeseen stresses can be caused by ingestion of loose objects on the runway, ice, or even bird strikes. The disk has to support the fan blades in such a way that they can absorb these impacts without breaking off and destroying the engine.

The second important function of the fan disk is the transfer of rotation from the fan to the low pressure compressor and turbine. This is facilitated by a shaft which passes from the fan disk through to the rear of the engine core. The low pressure compressor is mounted on this shaft right behind the fan and the low pressure turbine at the rear of the engine.

There are several other peripheral components mounted on the disk including the spinner or nose cone. This is the conical center piece on the fan which ensures an aerodynamic flow of air into the fan. All of these reliant elements mean that a fan disk failure constitutes one of the most serious engine problems pilots can encounter. For this reason, most fan disks are made from one piece titanium alloy forgings specially profiled to spread loads and stress effectively.

WikiMotors is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
WikiMotors, in your inbox

Our latest articles, guides, and more, delivered daily.

WikiMotors, in your inbox

Our latest articles, guides, and more, delivered daily.