Regan Brown
The Boeing 747 is one of the world's most iconic aircraft, with an impressive range and high passenger capacity. But how much fuel does this jumbo jet burn in an hour? The answer depends on several factors, including the aircraft's model, weight, payload, engine efficiency, flight path, and weather conditions. For example, the debut version of the 747, the 747-100, could carry 48,400 gallons of fuel, while the 747-400 had a fuel capacity of 57,285 gallons. The 747's four engines burn approximately 10 to 11 tonnes or 3,500 to 3,800 gallons of fuel per hour when cruising at altitude. This equates to roughly 1 gallon (about 4 liters) of fuel every second.
| Characteristics | Values |
|---|---|
| Fuel burned per second | 1 gallon (approximately 4 litres) |
| Fuel burned per hour | 3,500-3,800 gallons (10-11 tonnes) |
| Fuel burned during takeoff | 5,000 gallons (approximately 19,000 litres) |
| Fuel capacity (747-100) | 48,400 gallons (approximately 183,000-183,214 litres) |
| Fuel capacity (747-400) | 57,285 gallons (216,840 litres) |
| Fuel capacity (747-8i Intercontinental) | 63,034 gallons (238,610 litres) |
| Fuel capacity (747-8f freighter) | 59,734 gallons (226,095 litres) |
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What You'll Learn
A 747 burns 1 gallon of fuel per second
A Boeing 747 is a large and iconic plane, with a high passenger capacity that has allowed airlines to open up new direct routes worldwide. It is a four-engine jet aircraft that uses a phenomenal amount of fuel. In fact, a 747 burns approximately 1 gallon (about 4 litres) of fuel per second, or 3,500 gallons per hour. That's a lot of fuel!
To put that into perspective, during a 5-hour flight, a 747 will burn 18,000 gallons of fuel. And on a 10-hour flight, it might burn 36,000 gallons. Takeoff is the most fuel-intensive part of each flight, with the aircraft burning up to 5,000 gallons.
The amount of fuel a 747 burns can also be looked at in terms of miles per gallon. A 747 burns approximately 5 gallons of fuel per mile. However, when you consider that a 747 can carry up to 568 people, the numbers look a little different. That's 100 miles per gallon per person.
With sustainability and climate change becoming increasingly important, the amount of fuel burned by aircraft is under scrutiny. While modern twin-engine aircraft are more fuel-efficient, the 747 remains a popular choice for airlines due to its high passenger capacity.
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This equates to 10-11 tonnes of fuel per hour
The Boeing 747 is a quadjet aircraft with four engines that burn a significant amount of fuel. During cruise flight, a 747 burns approximately 10 to 11 tonnes of fuel per hour, which is roughly 3,500 gallons or 1 gallon (around 4 litres) every second. This amounts to a substantial hourly fuel consumption, contributing to the high operating expenses associated with jet fuel for airlines.
The fuel efficiency of the 747 can be contextualised by considering its passenger capacity. On a flight carrying 500 passengers, the fuel burn rate translates to 100 miles per gallon for each passenger. This perspective highlights the 747's efficiency relative to the fuel mileage of a typical car with a lower passenger capacity. However, it's important to note that the 747's fuel consumption is influenced by various factors, including the aircraft's model, weight, payload, engine efficiency, flight path, and weather conditions.
Takeoff is the most fuel-intensive phase of a 747's flight, requiring approximately 5,000 gallons (about 19,000 litres) of fuel. The debut version of the 747, the 747-100, had a fuel capacity of 48,400 gallons (approximately 183,000 litres). Subsequent models, such as the 747-400, improved fuel efficiency and increased fuel capacity to 57,285 gallons (216,840 litres). The final 747 model, the 747-8, further enhanced payload capacity and fuel efficiency.
The high fuel consumption of the 747 has led airlines to transition towards more fuel-efficient aircraft, such as twinjet widebody designs. The Boeing 747, with its impressive range and passenger capacity, has played a significant role in expanding direct flight routes worldwide. However, the environmental impact of its fuel burn is a concern, particularly when considering the effects of burning aviation fuel at altitude.
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The 747's mpg is 0.19 miles per gallon
The Boeing 747 is a quadjet aircraft with four engines that burn a large amount of fuel. While the exact fuel consumption depends on several factors, such as the aircraft's weight, payload, engine efficiency, flight path, and weather conditions, the 747 typically burns around 3,500 to 3,800 gallons of fuel per hour when cruising at altitude. This amounts to approximately 0.9 gallons of fuel every second.
When considering the standard cruising speed of a 747 at around 580 mph, it covers a mile every 6.2 seconds. To cover this mile, the aircraft consumes about 5.9 gallons of fuel, resulting in a miles per gallon (mpg) rating of 0.19. This means that for every gallon of fuel burned, the 747 can travel approximately 0.19 miles.
While this mpg rating may seem low, it's important to consider the high passenger capacity of the 747, which can carry up to 568 people. When the fuel consumption is calculated per passenger, the 747's efficiency improves significantly. With a full passenger load, the aircraft achieves 100 miles per gallon per passenger, making it more efficient than a typical car, which averages 25 miles per gallon.
However, it's worth noting that the 747's fuel efficiency and environmental impact have been the subject of debate. The aircraft burns through vast quantities of fuel, and the burning of aviation fuel at high altitudes has unique environmental consequences. Climate scientists use "radiative forcing" to measure the environmental harm caused by different activities, and aviation's climate impact per passenger-hour is significantly higher than that of car travel.
Despite the 747's low mpg rating, the introduction of more fuel-efficient aircraft with lower passenger capacities does not necessarily improve the mpg per passenger. The overall efficiency of air travel is a complex issue that involves various factors, including the number of passengers, fuel consumption, and environmental impacts.
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Takeoff is the most fuel-intensive part of a flight
A Boeing 747 burns approximately 1 gallon (about 4 litres) of fuel every second, totalling 18,000 gallons in a 5-hour flight. This amounts to 10-11 tonnes of fuel burned per hour. While this is a staggering amount, several factors affect an aircraft's fuel efficiency, and it is important to note that takeoff is the most fuel-intensive part of a flight.
Takeoff requires the engines to work at their hardest, burning the most fuel per minute. This is because heavier takeoff weights necessitate more thrust, increasing the burn rate during takeoff and climb. The dynamic phases of takeoff and landing involve speed changes, as opposed to the constant speed maintained during cruising. Additionally, cruising altitudes offer thinner air, reducing drag and optimising fuel burn for distance travelled.
The shorter the flight, the more non-cruising elements, such as takeoff, contribute to total fuel use. On longer flights, the cruise phase dominates fuel consumption due to its extended duration. For instance, on a long flight to Hong Kong, cruising accounted for 96% of the total fuel burned, while a shorter flight to Dubai, operated with a heavier aircraft, burned the most fuel overall, with cruising accounting for 95%.
Aircraft type also plays a role in fuel efficiency, with modern aircraft like the Boeing 787 and Airbus A350 having more fuel-efficient engines and aerodynamics, reducing fuel burn compared to older models. The weight and load of cargo, passengers, and fuel onboard further influence fuel consumption, with airlines optimising fuel loads to balance efficiency and range.
While takeoff is the most fuel-intensive part of a flight, considering the various factors affecting fuel efficiency, it is evident that the overall fuel consumption of an aircraft is a complex and nuanced matter.
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Modern twin jets are more fuel-efficient
The Boeing 747 Jumbo Jet is a four-engine aircraft that burns approximately 10 to 11 tonnes of fuel per hour, which equates to roughly 1 gallon (approximately 4 litres) of fuel every second. Over a 10-hour flight, this amounts to 36,000 gallons (150,000 litres) of fuel.
Modern twin jets, on the other hand, are significantly more fuel-efficient. They achieve greater fuel efficiency by having two larger engines that run at a lower cruise thrust than four smaller engines running at a higher cruise setting. This improves Thrust Specific Fuel Consumption (TSFC), resulting in lower fuel burn per pound of thrust per hour. Additionally, twin jets have the advantage of reduced complexity, weight, and drag associated with having fewer engines.
The increased fuel efficiency of twin jets compared to four-engine jets can also be attributed to their lower weight and the reduced amount of materials required for their construction. Twin jets, such as the Boeing 777, have matched or surpassed older four-engine jets like the Boeing 747 in terms of carrying capacity, further enhancing their fuel efficiency.
The higher fuel efficiency of twin jets has led to their widespread adoption in the aviation industry. Airlines are increasingly retiring three-engine and four-engine designs in favour of twin jets due to their improved fuel economy. Twin jets, such as the Boeing 737 and Airbus A320, have become common in commercial aviation, offering safer operations and reduced operating costs.
In summary, modern twin jets exhibit superior fuel efficiency compared to four-engine jets like the Boeing 747. This is achieved through the use of two larger engines, reduced weight, and simplified design, resulting in lower fuel consumption and operating costs. The increased fuel efficiency of twin jets has driven their widespread adoption across the aviation industry.
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Frequently asked questions
A 747 burns approximately 3,500 gallons of fuel per hour.
The amount of fuel burned can vary depending on several factors, including the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions.
The 747 is less fuel-efficient than modern twin-engine aircraft, which have improved fuel efficiency due to technological advancements. However, when considering the number of passengers carried, the 747 can achieve up to 100 miles per gallon per passenger.
Takeoff requires the most fuel as the aircraft needs to reach speed and climb to cruising altitude while at its heaviest. A 747 typically burns around 5,000 gallons of fuel during takeoff.
During a 10-hour flight, a 747 is estimated to burn approximately 36,000 gallons of fuel.
