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The F-35B STOVL Version: How It Utilizes Its Center Lift Fan Space

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The F-35B STOVL (Short Takeoff and Vertical Landing) variant of the F-35 aircraft has a unique feature – a 50-inch lift fan located near its center. This fan is a critical component for its VTOL (Vertical Take-Off and Landing) capabilities. However, it also presents a unique challenge in terms of how space is utilized within the aircraft. Are the other versions of the F-35 (F-35A and F-35C) doing something different with the same space? Let's explore this in detail.

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Connection to the Drive Shaft

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Interestingly, all variants of the F-35 have the connection for a drive shaft, which is used to connect the lift fan to the engine. However, the F-35A initially had plans to use some of this space for a Directed Energy weapon. The idea was to harness the drive shaft to generate electricity for the weapon, which would likely be a solid-state laser in the 150 kW class. While this is a promising concept, it’s currently under development and requires further miniaturization. In the interim, a fuel bladder is a more practical and prospective solution for the F-35A.

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For the F-35B and F-35C, the space is primarily used for fuel storage. This is evident from various diagrams and descriptions, such as the one provided with the graphic, which shows the internal differences in a detailed manner. The F-35B, owing to its STOVL design, has a compact configuration, and the lift fan space is used to accommodate an additional fuel tank. This allows the F-35B to maintain a significantly reduced combat range compared to the F-35C, which has a larger wingspan and can carry more fuel internally.

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Combat Range and Fuel Configuration

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The other versions of the F-35 make better use of the lift fan space for fuel storage. The F-35C, in particular, carries about 4000 pounds more fuel than the F-35A. This is a result of the F-35C's larger wings, which allow it to carry a greater internal fuel load. As a consequence, the F-35C has a better combat range, which is crucial for carrier-based operations.

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For the F-35A, which operates from conventional runways, the lift fan space is not as utilized for fuel. Instead, it is primarily used for storing fuel, often with the boom-type refueling hardware and a bit of avionic equipment. The F-35A can typically carry around 3000 pounds of fuel, which is sufficient for its operational needs but falls short of the capacity of the F-35C.

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Conclusion

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The F-35B STOVL variant's lift fan space is a double-edged sword. While it poses a challenge in terms of space optimization, it also offers unique advantages. The F-35A and F-35C have found practical ways to utilize this space, with the F-35B currently leaning towards fuel storage to enhance its operational capabilities. As technology continues to evolve, innovative solutions may allow for more advanced uses of this space, potentially integrating directed energy weapons while retaining sufficient fuel capacity.

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For more information on the F-35 and its variants, as well as insights into the intricacies of aircraft design and operation, please refer to the resources and further reading section below.

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Further Reading

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Explore detailed articles and resources on the F-35 aircraft, including its variants and technological advancements. Understanding the nuances of aircraft design and functionality is crucial for any aviation enthusiast or defense analyst.