Sylvie Willis
Fuel tanks are an essential component of aircraft. They are typically located in the wings, but can also be found in the fuselage (body) or empane of the aircraft. The placement of fuel tanks in the wings has several advantages, including improving structural efficiency, reducing fuel system complexity, and enhancing passenger safety by separating the fuel from the passenger compartment. Additionally, the hollow structure of the wings provides an ideal space to store fuel, maintaining balance during flight. However, it's important to note that some aircraft have fuel tanks inside the body, and the specific tank locations vary depending on the plane's size and complexity.
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What You'll Learn
Fuel tanks are often located in the wings
Aircraft fuel is heavy, weighing about 6 pounds per gallon. A Boeing 747 travelling from New York to Los Angeles would have a minimum of over 100,000 pounds of fuel onboard. Placing the majority of this weight inside the wings is beneficial, as it sets the heaviest weight inside the source of lift for the plane. This reduces stress on the wings and minimises the repeated bending stress that the mount points would otherwise be subject to.
Additionally, the wings are generally the source of lift for the plane. When an aircraft is on the ground, it rests on its wheels, but when it is in flight, it rests on its wings. Therefore, adding weight to the wings reduces the structural load, as the weight is coming from the source of the lift. This also means that the aircraft can carry more cargo without adding weight to the wings.
However, there are some disadvantages to placing fuel tanks in the wings. Different gravitational forces and wing-bending between full and empty tanks result in repeating stresses that shorten the aircraft's lifespan. There is also a higher risk of catastrophic damage to the wings in the case of in-flight fuel ignition.
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This improves structural efficiency and safety
Fuel tanks are integral to aircraft, and their placement is a crucial aspect of structural efficiency and safety. While the wings are the most common location for fuel storage, some aircraft also have tanks inside the fuselage or body. The placement of fuel tanks in the wings offers several advantages that improve the overall efficiency and safety of the aircraft.
Firstly, placing the fuel tanks in the wings helps to maintain structural integrity. The weight of the fuel in the wings adds inertia, making them more stable and reducing the impact of turbulent airflow. This minimizes repeated bending stress on the wing mount points, resulting in a more stable flight. Additionally, distributing the weight of the fuel evenly between the wings helps maintain the aircraft's balance and centre of gravity, reducing the risk of the aircraft tipping up or down.
Secondly, utilizing the hollow structure of the wings for fuel storage optimizes space and weight distribution. If fuel were stored exclusively in the fuselage, it would consume a significant amount of storage space and make the aircraft structure heavier. By placing the fuel tanks in the wings, the weight is shifted towards the source of lift, reducing structural loading and stress on the wings during flight. This design allows for more cargo space and improves the overall efficiency of the aircraft.
Furthermore, the placement of fuel tanks in the wings enhances safety in the event of a fuel fire. While fuel tank fires are catastrophic regardless of their location, placing the tanks in the wings reduces the risk of catastrophic damage to the fuselage in the event of in-flight fuel ignition. Additionally, modern aircraft are equipped with inerting systems to prevent and mitigate the impact of fuel tank fires.
The design and placement of fuel tanks in aircraft, especially in the wings, undergo careful consideration to ensure structural efficiency and safety. By optimizing weight distribution, maintaining balance, and minimizing stress on the aircraft structure, the placement of fuel tanks in the wings contributes to the overall performance and safety of the aircraft.
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There are internal and external fuel tanks
Fuel tanks are an essential component of aircraft. They are classified as either external or internal. External tanks include conformal fuel tanks and drop tanks. Conformal tanks are used in military aviation to increase the amount of fuel an aircraft can carry. Drop tanks are externally carried by planes and are occasionally found in civilian aircraft.
Internal fuel tanks can be located anywhere on the aircraft, but the most common locations are the wings or fuselage. Integral tanks, for example, are formed within the airframe structure. Rigid removable fuel tanks are installed in a compartment designed to hold the tank and are typically made of aluminum alloy or stainless steel. Bladder tanks are another type of internal fuel tank. They are flexible, reinforced rubber bags that can be installed through the fuel filler neck or access panel.
The placement of fuel tanks in aircraft wings has several advantages. Firstly, it improves structural efficiency by counterbalancing the wing's lift and the fuselage's weight. Secondly, it reduces fuel system complexity, especially in high-wing single-engine aircraft. Additionally, placing the majority of the weight inside the wings helps maintain the aircraft's balance and reduces stress on the wings.
While some aircraft have fuel tanks in the fuselage, there are safety concerns associated with this location. Fuselage tanks are more susceptible to forming explosive vapors due to their proximity to sources of heat. In contrast, wing tanks are naturally cooled by airflow, reducing the risk of fuel ignition.
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External tanks are used in military aviation
Fuel tanks are a critical component of aircraft, and they can be classified as either external or internal. External tanks, also known as drop tanks, are commonly used in modern military aviation and occasionally in civilian aviation.
External tanks are auxiliary fuel tanks that are carried outside the aircraft, typically attached to the wings or the underside of the plane. They are designed to provide additional fuel capacity for extended range and endurance, which is particularly important for military aircraft on long-duration missions or those requiring greater patrol time, such as the Supermarine Spitfires used by the RAF in 1942.
The use of external tanks offers several advantages. Firstly, they allow for increased fuel capacity without significantly compromising the internal cargo space of the aircraft. This is especially beneficial for military aircraft that need to carry a variety of weapons and equipment. Secondly, external tanks can be jettisoned in certain situations, such as emergencies or combat, to reduce weight, drag, and increase manoeuvrability. This was a crucial feature during wartime when metal shortages were common, and the ability to discard the tank could enhance the aircraft's performance and chances of survival.
The disadvantages of external tanks include the imposition of drag penalties, reducing the roll rates for air manoeuvres. Additionally, they reduce the number of external hardpoints available for weapons, impacting the weapon-carrying capacity and increasing the aircraft's radar signature.
Modern advancements have led to the development of conformal fuel tanks (CFTs), which are used instead of or in addition to traditional external fuel tanks. CFTs produce less drag and do not occupy external hardpoints, improving the aircraft's performance and stealth capabilities.
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Internal tanks are made of aluminium alloy or stainless steel
Fuel tanks are crucial for an aircraft's range and performance. They can be divided into external and internal tanks, and then further classified by their method of construction or intended use.
Internal tanks include integral tanks, rigid removable fuel tanks, and bladder tanks. Integral tanks are formed within the structure of the wings or fuselage and are sealed with a fuel-resistant sealant. Rigid removable fuel tanks are installed in a designated compartment and are made of aluminium alloy or stainless steel components welded together. Bladder tanks are reinforced rubberized bags that keep the fuel in a collapsible tank.
Aluminium alloys commonly used for fuel tanks include the 1100, 3003, 5052, and 6061 series. The 5052H32 designation, in particular, is known for its ease of forming and availability. When welding aluminium, it is important to be aware of its high thermal conductivity, which can lead to sudden melting and puddling. Additionally, its high rate of expansion makes it susceptible to distortion and warpage during welding. To address this, a heavy bead should be applied to all seams, and plenty of filler rod should be added.
Stainless steel is also used for internal fuel tanks, offering strength and durability. The 304 grade is standard stainless steel, while the 316 grade is marine stainless steel with higher corrosion resistance, making it suitable for salt-water environments.
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Frequently asked questions
Airline fuel tanks are commonly located in the wings of the aircraft. This is because the weight of the fuel helps to maintain the structural integrity of the wings.
Yes, some aircraft also have fuel tanks inside the body of the aircraft, in the fuselage, or in the empange.
There are several reasons for this. Firstly, the wings are hollow and provide ample space for fuel storage. Secondly, placing the weight of the fuel in the wings helps to maintain the aircraft's balance during flight. Finally, it is safer to keep the fuel away from the passenger compartment.
