Rajan Wilcox
The Boeing 747 is one of the world's most recognisable aircraft, with its high passenger capacity and long range enabling airlines to open up new, previously unserved direct routes worldwide. The 747's immense fuel capacity is stored in multiple fuel tanks, primarily in its wings, with two main fuel tanks in each wing, reserve fuel tanks in the outer wing sections, and a central wing tank in the middle. The debut version, the 747-100, could carry 48,400 gallons of fuel, while the most recent model, the 747-8, can carry 63,034 gallons of fuel.
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What You'll Learn
The Boeing 747's fuel capacity
The Boeing 747, nicknamed the "Queen of the Skies", is one of the most recognisable airplanes in the world. Its long range and high passenger capacity have allowed airlines to open up new and previously unserved direct routes worldwide. The 747's design includes structural redundancy, redundant hydraulic systems, quadruple main landing gear, and dual control surfaces.
The exact fuel capacity of the Boeing 747 varies between models, with some models containing additional fuel tanks in the tail. The debut version, the 747-100, could carry 48,400 gallons of fuel (approximately 183,214 litres). The 747-100B model, developed from the -100SR, had an increased fuel capacity of 48,070 gallons (182,000 litres), allowing for a 5,000-nautical-mile range with a typical 452-passenger payload.
The Boeing 747-200 and 300 models came with incremental upgrades, including a slight increase in fuel capacity to 52,410 gallons (199,158 litres). The 747-400 model further improved range, capacity, and fuel efficiency, with a fuel capacity of 57,285 gallons (216,840 litres).
The final 747 model, the 747-8, was the longest commercial aircraft produced at the time of its arrival. Boeing built two types: the 747-8i Intercontinental, which carried 63,034 gallons (238,610 litres), and the 747-8f freighter, with a fuel capacity of 59,734 gallons (226,095 litres).
The majority of the fuel is stored in the aircraft's wings, allowing the plane to remain balanced as the fuel funnels down into the engines symmetrically, increasing the storage capacity in the fuselage for cargo. On a 747, there are two main fuel tanks in each wing, reserve fuel tanks in the outer wing sections, and a central wing tank in the middle. For structural reasons, the wing tanks are filled first, and then any remaining fuel needed for the specific flight is put into the central wing tank. Select models of the jumbo jet can also seal part of the horizontal stabilizer and use it as an auxiliary fuel tank to increase the total capacity.
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Where fuel is stored
The Boeing 747 is a large aircraft with a high fuel capacity. The amount of fuel it can carry depends on the aircraft model. The debut version, the 747-100, could carry 48,400 gallons of fuel, while the 747-400 can hold 57,164 gallons. The latest model, the 747-8, has a capacity of 63,034 gallons.
The majority of the fuel on a 747 is stored in the wings. The wings of an aircraft naturally form large enclosed empty spaces, which are convenient for storing large volumes of liquid fuel. The weight of the fuel in the wings also counteracts the upward bending moment caused by lift, allowing for a lighter wing structure and a more useful payload.
There are two main fuel tanks in each wing, with reserve fuel tanks in the outer wing sections. The wing tanks are filled first, followed by the central wing tank. This distribution of fuel among the tanks affects the aircraft's performance. During a long trip, it is important that the fuel in some tanks is burned off before using the fuel in other tanks, to prevent the aircraft from becoming unbalanced.
Some models of the 747 can also seal part of the horizontal stabilizer and use it as an auxiliary fuel tank to increase capacity.
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How fuel is stored
The Boeing 747 is one of the most well-known airplanes in the world, with a high passenger capacity and long range. The amount of fuel a 747 can carry depends on the aircraft model and can be up to 63,000 gallons, weighing nearly as much as the empty plane itself.
The majority of the fuel on a 747 is stored in the wings. There are two main fuel tanks in each wing, reserve fuel tanks in the outer wing sections, and a central wing tank in the middle. For structural reasons, the wing tanks are filled first, followed by the central tank if more fuel is needed for the specific flight. Placing the majority of the weight inside the wings helps to balance the aircraft, as the wings are the source of lift for the plane. This also reduces the stress on the wings, as the weight is more evenly balanced.
Evenly distributing the weight of the fuel between the wings helps to maintain the aircraft's balance. The wings are designed to be watertight and can hold aviation fuel. The use of spars between sections of the wing prevents the fuel from sloshing around, although these spars have holes that allow fuel to pass through at a slower rate.
In addition to the tanks in the wings, some planes also have fuel tanks inside the body of the aircraft. However, placing fuel in the wings has several benefits, including saving space and reducing pressure on the wings.
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Fuel efficiency
The Boeing 747 is a large aircraft that can carry approximately 63,000 gallons of fuel, weighing around 400,000 lbs. This is nearly as much as the weight of the empty plane itself. The 747's four engines burn approximately 1 gallon of jet fuel per second, or about 10 to 11 tonnes of fuel per hour when cruising at altitude. The amount of fuel burned per mile varies depending on the model of the aircraft, but it is estimated that the 747 burns around 5 gallons of fuel per mile.
Despite these large fuel requirements, the 747 is still considered relatively fuel-efficient, especially when compared to cars. On a per-passenger basis, the 747 can achieve around 100 miles per gallon, which is significantly higher than the average car's fuel efficiency of 25 miles per gallon. This is due to the 747's ability to carry a large number of passengers, with a capacity of up to 568 people.
The fuel efficiency of aircraft can be improved through various means. One way is by improving aerodynamics and reducing weight, which can be achieved through the use of lightweight composite materials. Additionally, improving engine brake-specific fuel consumption and propulsive efficiency can also increase fuel efficiency. The introduction of winglets on aircraft wings, such as those used by Airbus and Boeing, has been shown to reduce fuel burn by up to 10%.
The 747 has also benefited from technological advancements over the years, with newer models such as the 747-400 offering increased range, capacity, and fuel efficiency improvements. The use of kerosene-based fuels, which have a higher flash point and provide more power than gasoline, also contributes to the 747's fuel efficiency.
Overall, while the 747 requires a significant amount of fuel to operate, its efficiency in terms of fuel consumption per passenger is impressive. However, with the development of more efficient engines and aircraft designs, the 747 may be nearing the end of its service life as airlines look to more economical alternatives.
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Fuel load balance
The Boeing 747 is a remarkable feat of engineering, and its fuel capacity is a key factor in keeping this giant airborne. The average fuel capacity of a Boeing 747 is between 48,400 and 63,636 gallons of fuel, weighing about 400,000 lbs, which is nearly as much as the empty plane itself. This fuel is stored in multiple tanks located in different parts of the aircraft, and the distribution of fuel across these tanks plays a crucial role in maintaining the plane's balance during flight.
The 747 typically has two main fuel tanks located in each wing, with additional reserve fuel tanks in the outer wing sections. The wing tanks are filled first to ensure structural stability, and any remaining fuel required for the specific flight is then added to the central wing tank. This distribution of fuel across the wings helps to balance the plane during flight as the fuel symmetrically funnels down into each engine. By placing the fuel in the wings, near the centre of gravity, the aircraft minimizes shifts in balance as fuel is consumed.
The Boeing 747's fuel load balance is further enhanced by the ability to utilize the horizontal stabilizer as an auxiliary fuel tank on select models. This additional tank can be sealed off and filled with fuel to increase the total capacity, providing more flexibility in fuel distribution.
The fuel load balance of the 747 is a critical aspect of its design and operation. Ensuring that the fuel is distributed appropriately across the various tanks helps maintain the aircraft's stability and control during flight. The symmetrical funneling of fuel from the wing tanks to the engines is a key factor in achieving this balance.
The impressive fuel capacity and efficient fuel load balance of the Boeing 747 have contributed to its long-range capabilities and its ability to serve previously unserved direct routes worldwide. The continuous improvements in fuel capacity and overall performance across different model series have extended the aircraft's range and connected people and places globally.
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Frequently asked questions
A Boeing 747 can carry between 48,400 and 63,636 gallons of fuel, weighing around 400,000 lbs. The exact capacity depends on the model series, as Boeing has increased the maximum takeoff weight of the aircraft over time.
The majority of the fuel is stored in the aircraft's wings. There are two main fuel tanks in each wing, reserve fuel tanks in the outer wing sections, and a central wing tank in the middle. The wing tanks are filled first, followed by the central tank.
The four engines of the Boeing 747 burn approximately one gallon, or four litres, of fuel per second when cruising at altitude. This equates to around 10-11 tonnes, or 3,500 gallons, of fuel per hour. Takeoff is the most fuel-intensive part of the flight, with the aircraft burning up to 5,000 gallons of fuel.
