Regan Brown
External fuel tanks, also known as drop tanks, are used to increase the fuel capacity and range of aircraft. They are commonly found on military aircraft and occasionally on civilian aircraft. The use of external tanks allows aircraft to carry additional fuel for long-range flights without requiring a larger, heavier, and less maneuverable fuselage. These external tanks can be discarded when empty or in emergencies to reduce weight and drag, and increase maneuverability. While external fuel tanks offer the advantage of increased fuel capacity, they also impose a drag penalty, reduce roll rates, and impact the aircraft's radar signature. Designers of large commercial aircraft often opt for integral tanks within the wings to save weight and minimize the stresses on the aircraft structure.
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What You'll Learn
- External tanks are commonplace on military aircraft and occasionally found on civilian aircraft
- They increase the range of aircraft, allowing them to fly for longer
- External tanks can be jettisoned in an emergency to reduce weight and increase manoeuvrability
- They can be used in conjunction with internal tanks, which are often preferred on private jets
- External tanks can cause drag, reducing roll rates for air manoeuvres and increasing fuel consumption
External tanks are commonplace on military aircraft and occasionally found on civilian aircraft
External fuel tanks, also known as drop tanks, are commonplace on military aircraft and occasionally found on civilian aircraft. They are used to provide additional fuel for long-range flights or to increase patrol time. Drop tanks were first used on 5 March 1923 and were later utilised during the Spanish Civil War. External tanks are often expendable and can be jettisoned in the event of an emergency or combat to reduce drag, weight, and increase manoeuvrability.
Military aircraft frequently employ drop tanks to extend their range and endurance. For example, the Mitsubishi A5M and A6M Zero fighter aircraft used external fuel tanks to enhance their operational capabilities. During World War II, the Luftwaffe also adopted the use of external fuel tanks, further showcasing their importance in military operations.
Civilian aircraft, on the other hand, rarely use external fuel tanks. Private jets, in particular, do not typically utilise external tanks due to the added drag and weight. Instead, they rely on internal tanks, either built-in or retrofitted, to increase their range. Larger civilian aircraft may use integral tanks, which are areas inside the aircraft structure that have been sealed for fuel storage, such as the ""wet wing" design commonly found in larger aircraft.
However, there are exceptions where civilian aircraft may occasionally use external fuel tanks. For instance, during the transit of Supermarine Spitfires to Malta in 1942, the RAF employed external fuel tanks. Additionally, in certain emergency situations or long-haul flights, civilian aircraft may require the use of external tanks.
Overall, while external fuel tanks are more commonly associated with military aircraft, there may be rare instances where civilian aircraft utilise them to extend their range or in emergency situations.
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They increase the range of aircraft, allowing them to fly for longer
External fuel tanks, also known as drop tanks, are commonplace on modern military aircraft and occasionally found on civilian aircraft. They are used to increase the range of aircraft, allowing them to fly for longer.
The use of external fuel tanks dates back to the early 20th century, with the first recorded use on March 5, 1923. During the Spanish Civil War, fighter aircraft utilized drop tanks to carry additional fuel for long-range escort flights. This allowed them to maintain their agility without needing a larger, heavier fuselage. The Mitsubishi A5M, designed by Jiro Horikoshi, began carrying an external underside drop tank in 1937 to provide fuel for extended range.
The use of external tanks continued to evolve during World War II, with the Luftwaffe adopting 300-litre external fuel tanks. The Allies also employed external tanks to increase the range and patrol time of their fighters over continental Europe. One notable example is the use of external tanks by the RAF during the transit of Supermarine Spitfires to Malta in 1942.
External fuel tanks provide a significant advantage in terms of range and endurance. For instance, the Imperial Japanese Navy's Mitsubishi A6M Zero fighter was designed with endurance specifications that included the use of drop tanks, allowing for two hours of flight at full power or six to eight hours at cruising speed. Similarly, during World War II, P-38 fighters utilized drop tanks to carry out Operation Vengeance, the downing of Admiral Isoroku Yamamoto's aircraft. Each P-38 was equipped with two drop tanks, providing a substantial increase in fuel capacity.
While external fuel tanks enhance range, they also impose certain trade-offs. These tanks introduce drag, increase the moment of inertia, and reduce roll rates for air maneuvers. Additionally, they occupy external hardpoints that could otherwise be used for weapons, impacting the aircraft's weapon-carrying capacity. As a result, modern combat aircraft may opt for conformal fuel tanks (CFTs) that produce less drag and do not occupy external hardpoints. Nevertheless, the ability to increase range remains a critical advantage offered by external fuel tanks, making them a valuable option for extending the endurance of military and civilian aircraft alike.
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External tanks can be jettisoned in an emergency to reduce weight and increase manoeuvrability
External fuel tanks, also known as drop tanks, are commonplace on modern military aircraft and occasionally found on civilian aircraft. They are expendable and can be jettisoned in an emergency to reduce weight and increase manoeuvrability.
The first drop tanks were designed to be discarded when empty or in the event of an emergency or combat situation. Drop tanks were first used on 5 March 1923 and were later used during the Spanish Civil War to allow fighter aircraft to carry additional fuel for long-range flights without requiring a larger, heavier fuselage.
During World War II, the Luftwaffe began using external fuel tanks with the introduction of a 300-litre (66 imperial gallon, 79 US gallon) light alloy model. The Mitsubishi A5M, designed by Jiro Horikoshi, began carrying an external underside drop tank in 1937 to provide fuel for extended range.
The use of external tanks reduces the number of external hardpoints available for weapons, reduces the weapon-carrying capacity, and increases the aircraft's radar signature. They also impose a drag penalty on the aircraft, and the fuel in the drop tanks is used first.
Private jets do not typically have external fuel tanks, although some have wingtip tanks as built-in or aftermarket upgrades.
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They can be used in conjunction with internal tanks, which are often preferred on private jets
External fuel tanks, also known as drop tanks, are commonplace on modern military aircraft and occasionally found on civilian aircraft. They are used to provide additional fuel capacity for long-range flights and to increase patrol time. External tanks are often used in conjunction with internal tanks, which are typically preferred on private jets.
Private jets have the option of adding extra range through the use of internal auxiliary fuel tanks. These tanks can be retrofitted into the cargo hold or integrated within the structure of the jet, providing additional fuel capacity without the drag and weight penalties associated with external tanks. The use of internal tanks also avoids the implication that the private jet is equipped with weapons, as external tanks on civilian aircraft are typically associated with military purposes.
The decision to use internal tanks on private jets is influenced by several factors. Firstly, private jets have ample volume, allowing for the installation of internal tanks without compromising the overall design. Fighters, on the other hand, are compact and have limited space for extra fuel, making external tanks a more viable option. Secondly, the weight and drag imposed by external tanks can significantly impact the performance and range of private jets. External tanks require a substantial amount of fuel just to carry their own weight, reducing the effective range of the aircraft.
Additionally, the use of internal tanks on private jets provides a more seamless and aesthetically pleasing design. Private jet owners often prioritize comfort, luxury, and customization, and external tanks may detract from the overall appearance and functionality of the aircraft. By utilizing internal tanks, private jets can maintain a sleek and streamlined exterior while still achieving the desired range.
Overall, the preference for internal tanks on private jets is driven by a combination of performance, design, and functionality considerations. The use of internal tanks maximizes range, minimizes drag, and maintains the aesthetic appeal and versatility of the aircraft. While external tanks offer additional fuel capacity, they are often associated with military aircraft and may not align with the specific requirements and preferences of private jet owners.
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External tanks can cause drag, reducing roll rates for air manoeuvres and increasing fuel consumption
External fuel tanks, also known as drop tanks, are commonplace on modern military aircraft and occasionally found on civilian aircraft. They are used to increase the range of flights, as was the case during the Spanish Civil War, when fighter aircraft used external fuel tanks to accompany flights over long distances without needing to increase the size of the fuselage.
However, the use of external tanks has disadvantages. Notably, they cause drag, which reduces roll rates for air manoeuvres and increases fuel consumption. The drag imposed by external tanks varies with the square of the aircraft's speed. The extra drag caused by external tanks can be counteracted by using some of the tank's fuel, but this, in turn, reduces the amount of fuel available for the aircraft's operations.
The use of external tanks also reduces the number of external hardpoints available for weapons, decreasing the aircraft's weapon-carrying capacity. Furthermore, the additional weight of external tanks increases the moment of inertia, which further reduces the aircraft's roll rates for air manoeuvres.
To mitigate the disadvantages of external tanks, some modern combat aircraft use conformal fuel tanks (CFTs) instead. These produce less drag and do not occupy external hardpoints, although some versions can only be removed on the ground.
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Frequently asked questions
External fuel tanks, also known as drop tanks, are used to increase the fuel capacity and range of an aircraft. They are especially useful for fighter jets that need to fly long-range escort flights without requiring a larger, heavier, and less manoeuvrable fuselage.
External fuel tanks are typically used when an aircraft needs to fly longer distances or patrol for extended periods. The extra fuel allows the aircraft to stay airborne for a more extended period without needing to refuel.
External fuel tanks are often designed to be discarded or jettisoned when empty or in an emergency to reduce drag, weight, and increase manoeuvrability. However, modern external tanks may be retained in combat and only dropped in emergencies.
