Sylvie Willis
Conformal fuel tanks (CFTs) are additional fuel tanks that are fitted closely to the profile of an aircraft to extend its endurance. They are designed to conform to the aircraft's shape, typically mounted above the wings or along the fuselage, reducing the drag penalty from external fuel tanks. CFTs increase the range and endurance of aircraft, carrying 50% more fuel than centreline external fuel tanks while incurring only 12% of the drag. They also do not occupy ordnance hardpoints, allowing the aircraft to carry its full payload. However, CFTs cannot be discarded in flight, resulting in a slight weight penalty when empty. CFTs have been employed on various aircraft, including the F-16, F-15, Super Hornet, Rafale, and Gripen, with ongoing developments in multiple countries.
| Characteristics | Values |
|---|---|
| Definition | Additional fuel tanks fitted closely to the profile of an aircraft that extend the endurance of the aircraft. |
| Advantages | Reduced aerodynamic penalty compared to external drop tanks, do not occupy ordnance hardpoints, and do not significantly increase an aircraft's radar cross-section. |
| Disadvantages | Cannot be discarded in flight, impose a slight drag-penalty and minor weight gain on the aircraft even when the tanks are empty, impose slight g-load limits. |
| Examples | F-15E, F-16 Block 50/52/60, Super Hornet Block III, Gripen, Rafale, Ching Kuo, Eurofighter, MiG-29, J-10 |
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What You'll Learn
- Conformal fuel tanks (CFTs) are additional fuel tanks that conform to the aircraft's shape
- CFTs are plumbed into the aircraft and cannot be discarded in flight
- CFTs increase the aircraft's range, loiter time, and combat persistence
- CFTs have a reduced impact on aircraft agility and speed compared to external tanks
- CFTs free up ordnance hardpoints, allowing the aircraft to carry more weapons
Conformal fuel tanks (CFTs) are additional fuel tanks that conform to the aircraft's shape
CFTs are typically mounted above the wings or along the fuselage, either flush or with a slight bulge. They can significantly increase the aircraft's range and endurance, making them highly desirable for fighters that burn a lot of fuel. CFTs provide a notable advantage by freeing up underwing stations that would otherwise be used for fuel tanks, allowing for the carriage of additional bombs or missiles and improving manoeuvrability.
The F-16, for example, can utilise CFTs to carry 50% more fuel than a centreline external fuel tank while incurring only 12% of the drag. This increased fuel capacity translates to a 20-40% range increase, depending on the configuration and mission profile. Additionally, the F-16's renowned performance remains largely unaffected by the presence of CFTs, as per pilot testimonies.
Despite the advantages, CFTs present challenges in frequent maintenance access, particularly on ships with limited space. The Super Hornet Block III, for instance, encountered issues with CFTs requiring frequent maintenance panel access, making removal and reinstallation cumbersome. Furthermore, CFTs may impose slight g-load limits, although certain aircraft, like the F-15E, can maintain manoeuvrability without g-limitations.
Overall, CFTs offer a popular solution for extending the range of fighter aircraft without significantly compromising speed and agility. Their adoption by multiple countries, such as Israel, Turkey, Poland, Greece, and others, underscores their strategic value in enhancing aircraft performance and mission capabilities.
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CFTs are plumbed into the aircraft and cannot be discarded in flight
Conformal fuel tanks (CFTs) are additional fuel tanks that are fitted closely to the profile of an aircraft to extend its endurance. They are designed to conform to the aircraft's shape, typically mounted above the wings or along the fuselage. CFTs have several advantages over traditional external drop tanks. Firstly, they have a reduced aerodynamic penalty due to their streamlined integration with the aircraft, resulting in lower drag and a minimal impact on speed and agility. This improved aerodynamics allows for a significant increase in the aircraft's range and endurance without sacrificing performance.
CFTs are plumbed into the aircraft's fuel system, becoming an integral part of its structure. This integration provides a seamless fuel solution, ensuring that the aircraft can utilise the additional fuel efficiently. However, this also means that CFTs cannot be discarded in flight, unlike external drop tanks. Once installed, CFTs become a permanent part of the aircraft and can only be removed during ground maintenance. This characteristic of CFTs distinguishes them from drop tanks, which can be jettisoned when empty to reduce weight and improve performance.
The inability to discard CFTs in flight can have some implications for aircraft performance and maintenance. Even when empty, CFTs will impose a slight drag penalty and minor weight gain on the aircraft. This penalty is typically much lower than that of external drop tanks, but it is a trade-off that comes with the integration of CFTs. Additionally, the permanence of CFTs may require careful consideration during aircraft design and testing, especially for aircraft carriers where space for maintenance is limited.
Despite the inability to discard CFTs in flight, they offer significant benefits that enhance aircraft capabilities. CFTs free up ordnance hardpoints, allowing the aircraft to carry its full payload of weapons without compromising fuel capacity. This increased fuel capacity extends the aircraft's range and endurance, making it more versatile and effective for various mission profiles. CFTs also improve the aircraft's manoeuvrability by eliminating the need for underwing fuel tanks, resulting in a smoother and less obstructed airflow.
Overall, while CFTs cannot be discarded in flight, their advantages in terms of fuel capacity, reduced drag, and payload flexibility make them a valuable option for enhancing aircraft performance and mission capabilities. The integration of CFTs requires careful design and testing considerations, but the resulting improvements in range, endurance, and manoeuvrability can significantly enhance an aircraft's operational capabilities.
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CFTs increase the aircraft's range, loiter time, and combat persistence
Conformal fuel tanks (CFTs) are additional fuel tanks that are fitted closely to the profile of an aircraft. They are designed to extend the endurance of an aircraft, increasing its range, loiter time, and combat persistence.
CFTs are pod-like fuel reservoirs attached to the upper surface of an aircraft's fuselage, with the lower surface conforming to the aircraft's shape. This upper surface arrangement allows the CFTs to be relatively lightweight, as nothing is suspended from them. For example, the CFTs on the F-16 aircraft can hold approximately 3,050 pounds of additional fuel, resulting in a 43.5% fuel increase with minimal drag. This extended fuel capacity translates to a 20-40% increase in range, depending on the aircraft's configuration and mission profile.
The use of CFTs offers several advantages over traditional external fuel tanks. Firstly, they reduce the aerodynamic penalty by minimizing drag, allowing the aircraft to maintain its agility and performance characteristics. CFTs also do not occupy ordnance hardpoints, enabling the aircraft to carry its full payload of weapons without compromising fuel capacity. This increased fuel capacity and reduced drag contribute to extended loiter time, which is crucial for surveillance and intelligence-gathering missions.
Furthermore, CFTs enhance combat persistence by reducing the demand for tanker support. With CFTs, aircraft can fly longer-range strike missions without the need for frequent refuelling, increasing their operational effectiveness. This is particularly advantageous in combat scenarios where tanker support may be limited or challenging to access.
While CFTs offer significant benefits in terms of range, loiter time, and combat persistence, it is important to consider their limitations. Unlike external drop tanks, CFTs cannot be discarded in flight since they are plumbed into the aircraft. As a result, they impose a slight weight penalty and minor drag even when empty, without providing any additional fuel benefit. Additionally, CFTs may require frequent maintenance, which can be challenging, especially in space-constrained environments such as aboard a ship.
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CFTs have a reduced impact on aircraft agility and speed compared to external tanks
Conformal Fuel Tanks (CFTs) are additional fuel tanks that are fitted closely to the profile of an aircraft. They are designed to extend the endurance of the aircraft, allowing it to fly longer missions without refuelling. CFTs have the advantage of producing a reduced aerodynamic penalty compared to external drop tanks, resulting in less impact on the aircraft's agility and speed.
CFTs are designed to conform to the aircraft's shape, typically mounted above the wings or along the fuselage. This design choice allows CFTs to be relatively lightweight, as nothing is suspended from them. They carry more fuel than centreline external fuel tanks while producing significantly less drag. For example, Maj. Timothy McDonald, a U.S. Air Force project pilot, noted that CFTs on the F-16 have 50% more fuel capacity than centreline external tanks but only 12% of the drag.
The reduced drag of CFTs compared to external tanks contributes to their minimal impact on aircraft agility and speed. CFTs do not occupy ordnance hardpoints, allowing the aircraft to carry its full payload of weapons without compromising fuel capacity. This freedom from hardpoints also means that CFTs can be positioned to improve the aircraft's aerodynamics, further reducing their impact on agility and speed.
While CFTs offer advantages in terms of fuel capacity and aerodynamics, they are not without disadvantages. Unlike external drop tanks, CFTs cannot be discarded in flight as they are plumbed into the aircraft. As a result, they impose a slight drag penalty and minor weight gain on the aircraft even when empty. However, the impact of this weight gain and drag penalty on agility and speed is relatively small and can be outweighed by the benefits of increased fuel capacity and payload flexibility.
In conclusion, CFTs offer a reduced impact on aircraft agility and speed compared to external tanks due to their conformal design, reduced drag, and freedom from occupying ordnance hardpoints. While CFTs do impose some minor penalties, these are generally outweighed by the benefits they provide in terms of extended endurance and payload flexibility.
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CFTs free up ordnance hardpoints, allowing the aircraft to carry more weapons
Conformal fuel tanks (CFTs) are additional fuel tanks that conform to the aircraft's shape and are mounted on the fuselage or above the wings. They provide several advantages over traditional external drop tanks. Firstly, they have a reduced aerodynamic penalty, resulting in lower drag and a negligible effect on the aircraft's agility at subsonic speeds. This increased range and endurance enhance the aircraft's operational capabilities.
One of the most significant advantages of CFTs is that they free up ordnance hardpoints. In traditional aircraft designs, underwing weapons stations are often used to hang fuel tanks, taking up spaces where bombs or missiles could be placed. CFTs eliminate this issue by providing additional fuel capacity without occupying these valuable hardpoints. This allows the aircraft to carry its full payload of weapons, increasing its offensive capabilities.
For example, the F-16's CFTs can carry 450 gallons (about 3,050 pounds) of jet fuel, resulting in a 43.5% fuel increase with only 12% of the drag of traditional drop tanks. By freeing up the underwing hardpoints, CFTs enable the F-16 to carry more weapons and fly with two types of large weapons in a balanced configuration, doubling its primary weapon capacity. This flexibility is crucial for medium-range air-to-surface missions, where the ability to carry a diverse range of weapons is essential.
Additionally, CFTs can significantly increase the operational radius of an aircraft. For instance, the use of CFTs in long-range missions enables the aircraft to fly strike missions with a full complement of weapons. This extended range capability is particularly advantageous for countries like Canada and the US Navy, where the Super Hornet's reach can be significantly increased with CFTs, bringing it closer to the capabilities of the F-35.
However, it is important to note that CFTs have some limitations. Unlike drop tanks, CFTs cannot be discarded in flight as they are plumbed into the aircraft. As a result, they impose a slight drag penalty and weight gain even when empty. Additionally, CFTs may require frequent access for maintenance, which can be challenging, especially in space-constrained environments like aircraft carriers. Despite these drawbacks, CFTs offer a significant advantage in terms of fuel capacity and weapon-carrying capabilities.
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Frequently asked questions
Conformal fuel tanks (CFTs) are additional fuel tanks that are fitted closely to the profile of an aircraft. They are designed to extend the endurance of the aircraft.
Conformal fuel tanks are mounted above the wings of an aircraft, replacing the drag of underwing tanks. They carry extra fuel while adding extra lift and expanding the combat radius.
Conformal fuel tanks have a reduced aerodynamic penalty compared to external drop tanks. They do not occupy ordnance hardpoints, allowing the aircraft to carry its full payload. They also do not significantly increase an aircraft's radar cross-section.
Conformal fuel tanks cannot be discarded in flight, unlike drop tanks. They will impose a slight drag penalty and minor weight gain on the aircraft even when empty. They can also impose slight g-load limits.
