Sylvie Willis
The amount of fuel burned by a commercial jet depends on a variety of factors, including the type of aircraft, the weight of the plane, the number of passengers, the efficiency of the engines, the flight path, and weather conditions. For example, a Boeing 747 burns 1 gallon of fuel per second, while the Airbus A380, the largest passenger aircraft, consumes 4,600 gallons of fuel per hour. Fuel efficiency in aircraft is a crucial factor in reducing operating costs and environmental impact, with newer aircraft models offering improved fuel efficiency compared to older generations.
| Characteristics | Values |
|---|---|
| Fuel type | Kerosene-based |
| Fuel economy in aircraft | Measure of the transport energy efficiency of aircraft |
| Fuel efficiency | Improved with better aerodynamics, reduced weight, improved engine brake-specific fuel consumption, and propulsive efficiency or thrust-specific fuel consumption |
| Fuel burn | Depends on the type of aircraft and the number of people on board. For example, a 747 carrying 500 people burns 5 gallons of fuel per mile, which is 0.01 gallons per person per mile. |
| Fuel consumption | Depends on engine type and technology. Turbojet engines with afterburners consume a lot of fuel. For example, the F135 engine powering the F-35 Lightning II can burn up to 1,200 gallons of fuel per hour when using afterburner. |
| Fuel efficiency improvements | Technological advances, advanced materials, optimized aerodynamic designs, higher pressure and bypass ratios, geared turbofans, open rotors, hybrid electric or fully electric propulsion, airframe efficiency with retrofits, better materials and systems, and advanced aerodynamics |
| Fuel surcharges | Private jet charter operators, jet cards, and membership providers impose fuel surcharges |
| Fuel cost | Varies by airport and state. For example, on May 11, 2022, the IATA per-gallon price was $4.82 in North America, $4.01 in Europe, and $3.55 in Asia. |
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What You'll Learn
Fuel efficiency improvements
The amount of fuel burned by a commercial jet depends on a multitude of factors, including the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions. For example, a Boeing 747 burns 1 gallon of fuel per second, totalling 18,000 gallons in a 5-hour flight. The Airbus A380, the largest passenger aircraft, consumes 4,600 gallons of fuel per hour, totalling 23,000 gallons in 5 hours.
Despite these staggering numbers, aviation is responsible for only 12% of all CO2 emissions from the transport sector, compared to 74% from road transport. This is partly due to fuel efficiency improvements in aircraft design and operations. Here are some key areas where advancements have been made:
Aircraft Design
- Engine Efficiency: Modern aircraft engines are more fuel-efficient. For example, the Boeing 787 achieves greater efficiency through improved engines, lighter composite materials, aerodynamic shapes, and advanced computer systems.
- Wingtip Devices: Wingtip devices, such as winglets or sharklet wingtips, improve the lift-to-drag ratio, reducing lift-induced drag caused by wingtip vortices without increasing the wingspan.
- Propulsion Systems: Subsonic turboprop aircraft are more fuel-efficient than transonic turbofan aircraft due to reduced drag and fuel costs at lower speeds. NASA's cruise-efficient STOL (CESTOL) concept and advanced aerodynamics, structures, and geared turbofans aim for significant fuel savings.
- Aerodynamics and Materials: The BWB (blended wing body) concept offers greater fuel economy and range through improved aerodynamics and structural efficiencies. Lighter composite materials and aluminium metal foam also contribute to weight reduction and increased fuel efficiency.
Operations
- Payload Management: Airlines have increased fuel efficiency by carrying more payload, either by increasing aircraft size, adding more seats, or improving seat occupancy rates.
- Traffic Efficiency: Upgraded navigation and air and ground traffic management contribute to marginal fuel efficiency improvements.
- Cruise Speed: Operating at lower cruise speeds can augment the range and reduce fuel consumption and environmental impact.
- Route Optimisation: Advanced computer systems and data analytics help optimise flight routes, contributing to more fuel-efficient operations.
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Fuel consumption factors
Fuel consumption in jet aircraft depends on a multitude of factors, and the amount of fuel burnt can vary considerably. The aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions all play a role in determining fuel consumption.
The type of aircraft is a significant factor. For example, the Airbus A380, the world's largest passenger aircraft, consumes 4,600 gallons of fuel per hour, while the Boeing 747 burns 1 gallon of fuel every second, totalling 18,000 gallons in a 5-hour flight. Modern twin-engine aircraft, like the Airbus A350, are significantly more fuel-efficient than quadjets, consuming 38 lb of fuel per nautical mile.
The number of passengers on board also impacts fuel efficiency. A fully occupied flight will be more fuel-efficient per person than a flight with many empty seats. For example, a Boeing 747 with 500 passengers travelling 1 mile uses 5 gallons of fuel, resulting in a fuel efficiency of 100 miles per gallon per person.
The length of the flight is another factor. Shorter flights tend to be less fuel-efficient because the fuel used for takeoff is relatively large compared to the amount expended during cruise. Additionally, less fuel-efficient regional jets are typically used on shorter flights.
The type of engine and technology used also influence fuel consumption. Turbojet engines with afterburners, often used for high-speed performance, consume a significant amount of fuel. For instance, the F135 engine powering the F-35 Lightning II can burn up to 1,200 gallons of fuel per hour when using afterburner.
Fighter jets used for combat and training missions experience irregular fuel consumption due to frequent changes in speed and altitude. During simulated air combat, a fighter jet can consume up to 30% more fuel than a straight-line flight at a constant speed.
Other factors that impact fuel consumption include the weight of the aircraft, with extra fuel and weapons increasing fuel consumption, and the cost of fuel, which varies by airport and state.
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Jet fuel vs diesel
Commercial jets burn a significant amount of fuel during flights. For instance, a Boeing 747 burns one gallon of fuel per second, consuming 18,000 gallons during a five-hour flight. The Airbus A380, the largest passenger aircraft, consumes 4,600 gallons of fuel per hour, totalling 23,000 gallons for a five-hour flight.
Now, when comparing jet fuel and diesel, it's important to note that they serve different purposes, with jet fuel designed for turbine engines in aircraft and diesel designed for piston engines. Jet fuel is generally kerosene-based, with a higher flash point and sulphur content than diesel. This higher flash point makes jet fuel safer to handle and store in large quantities. Jet fuel is also 'drier' than diesel, with lower lubricity, which is acceptable for turbine engines but requires additives for long-term use in diesel engines.
Historically, jet fuel and diesel had a lot in common in terms of extraction, production, and composition. However, over time, they have diverged, with jet fuel becoming more specialized for aviation applications. Despite their differences, there are cases where jet fuel is used in diesel engines and vice versa, especially in ground support fleets at airports, where the use of jet fuel can be economically viable due to the large quantities involved.
In terms of fuel efficiency, jet aircraft are surprisingly efficient when considering the number of passengers they carry. A Boeing 747 carrying 500 passengers achieves 100 miles per gallon per person, which is significantly higher than the typical car's mileage of 25 miles per gallon. This highlights that, per passenger, air travel can be more fuel-efficient than car travel, especially with increased occupancy rates.
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Fuel economy
The fuel economy of a commercial jet is influenced by a multitude of factors, including the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions. The type of fuel used also plays a significant role in fuel economy, with kerosene-based fuels being the most common choice for large planes due to their higher flash point and increased power compared to gasoline.
The fuel efficiency of jet airliners has improved significantly over the years, with a 70% increase between 1967 and 2007. This improvement is attributed to advancements in engine efficiency and airframe design. For example, the Airbus A380 is said to have a fuel consumption rate of less than 3 L/100 km per passenger, which is significantly lower than that of older aircraft like the Concorde.
The number of passengers on board also impacts fuel economy. While a Boeing 747 may burn one gallon of fuel per second during a five-hour flight, resulting in a total of 18,000 gallons, this equates to only 0.01 gallons per person per mile. This means that each passenger is responsible for a much lower fuel consumption rate of 100 miles per gallon.
To optimize fuel usage and reduce costs and environmental impact, it is essential to understand the complex interplay between these factors. Additionally, newer technologies and advancements in aerodynamics contribute to improved fuel efficiency, leading to reduced fuel consumption in modern jet aircraft.
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Fuel costs
The fuel efficiency of jet aircraft has improved significantly over the years. Between 1967 and 2007, jet airliners became 70% more fuel-efficient, with a 40% improvement in engine efficiency and a 30% improvement in airframes. From 1968 to 2014, the average fuel burn of new aircraft decreased by 45%, resulting in a compounded annual reduction of 1.3%.
The type of aircraft also plays a crucial role in fuel consumption. For example, the Airbus A380, the largest passenger aircraft, consumes approximately 4,600 gallons of fuel per hour, totaling about 23,000 gallons for a five-hour flight. On the other hand, the Boeing 747 burns 18,000 gallons of fuel during a five-hour flight, or one gallon every second. Modern twin-engine aircraft, like the Airbus A350, are significantly more efficient, consuming 38 pounds of fuel per nautical mile.
To calculate the fuel cost for a specific flight, one can multiply the fuel consumption per hour by the current per-gallon cost of jet fuel. However, it's important to consider that fuel burn rates can be influenced by factors such as temperature, weight, the number of passengers and baggage, and the length of the flight.
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Frequently asked questions
The average fuel burn of new aircraft fell 45% from 1968 to 2014, with a compounded annual reduction of 1.3%. Jet airliners became 70% more fuel-efficient between 1967 and 2007. The amount of fuel burned depends on a variety of factors, including the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions.
This depends on the aircraft type. Light jets consume anywhere between 134 and 222 gallons of jet fuel per hour. The Bombardier Global 7500 burns 528 gallons per hour, while the Embraer Phenom 300 light jet uses 183 gallons per hour.
This depends on the aircraft and the nature of the mission. The F-16 Fighting Falcon consumes approximately 3,800 liters of fuel per hour when flying at high altitudes, while the F-22 Raptor can exceed 8,000 liters per hour due to its vectored thrust and stealth technology. The Rafale consumes around 2,500 liters of fuel per hour in cruising flight, but this can increase to 9,000 liters during combat maneuvers or when using afterburner.
