Regan Brown
The amount of fuel a plane burns depends on a variety of factors, including the type of aircraft, its capacity, the number of passengers, the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions. For example, a Boeing 747 burns approximately one gallon of fuel every second, while the Airbus A380, the largest passenger aircraft, consumes about 1.3 gallons per second. On the other hand, a smaller aircraft like the Cessna 172 burns around eight gallons of fuel per hour. The fuel efficiency of planes has improved over time, with jet airliners becoming 70% more fuel-efficient between 1967 and 2007. Additionally, operational procedures, maintenance practices, and flight paths can significantly impact fuel consumption and emissions.
| Characteristics | Values |
|---|---|
| Fuel used per second | 1 gallon (approximately 4 litres) |
| Fuel used per minute | 240 litres |
| Fuel used per hour | 14,400 litre |
| Fuel used for a 5-hour flight | 18,000 gallons |
| Fuel used for a 10-hour flight | 36,000 gallons |
| Fuel used for a 13-hour flight | 187,200 litre |
| Fuel used for a 7-hour London-New York flight | 2,400 gallons |
| Fuel used for a 5-hour flight by Airbus A380 | 23,000 gallons |
| Fuel used per nautical mile by Airbus A350 | 38 lb |
| Fuel used per nautical mile by Boeing 747 | 5 gallons |
| Fuel used per nautical mile by Airbus A380 | 14 litres |
| Fuel used per nautical mile by Airbus A350 | 6 litres |
| Fuel used per nautical mile by Airbus A321neo | 2.7 litres |
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What You'll Learn
The Boeing 747 burns 1 gallon of fuel per second
The Boeing 747 is a quadjet aircraft that burns a significant amount of fuel, approximately 1 gallon (or about 4 litres) every second. This amounts to a staggering 18,000 gallons of fuel consumed during a 5-hour flight. To put this into perspective, consider that the Airbus A380, the largest passenger aircraft, consumes slightly more fuel during the same duration due to its higher capacity. The A380 burns about 23,000 gallons in 5 hours, or 1.3 gallons every second.
The high fuel consumption of the Boeing 747 is a contributing factor to its poor miles-per-gallon rating. It burns approximately 5 gallons of fuel per mile, or 12 litres per kilometre. However, when the number of passengers is taken into account, the fuel efficiency per person improves significantly. The 747 can carry up to 568 people, and if we assume 500 passengers for simpler calculations, the plane achieves 100 miles per gallon per person.
The fuel efficiency of the Boeing 747 is further impacted by various factors, including the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions. These variables contribute to the overall fuel requirement and consumption during a flight. Additionally, the type of fuel used, such as kerosene-based jet fuel, also plays a role in fuel efficiency.
Despite the fuel consumption of the Boeing 747, aviation's contribution to CO2 emissions from the transport sector is lower than that of road transport. Aviation accounts for about 12% of transport sector CO2 emissions, while road transport accounts for a much higher percentage, at 74%. Nonetheless, with sustainability and climate change concerns gaining prominence, the focus on reducing fossil-fuel-based emissions has intensified.
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Fuel efficiency depends on aircraft capacity, age and engine type
The amount of fuel a plane uses every second varies depending on several factors, including the aircraft's capacity, age, and engine type.
Aircraft capacity, or the number of passengers it can carry, plays a significant role in fuel efficiency. For example, the Airbus A380, one of the largest passenger aircraft, consumes more fuel per hour than the Boeing 747 due to its higher capacity. However, when considering fuel efficiency per passenger, the A380 becomes more efficient, especially when compared to cars.
The age of an aircraft also impacts fuel efficiency. Newer aircraft like the Airbus A350 and the A321neo are more fuel-efficient than older models, with the A321neo using an average of 2.7 litres of fuel per kilometre. Technological advancements, such as improved engine efficiency, airframes, and aerodynamics, have contributed to the improved fuel efficiency of newer aircraft.
Additionally, the type of engine an aircraft uses affects fuel efficiency. Jet engines, such as those used by major airlines, have higher efficiency than turboprop engines, which have an optimum speed of 460 miles per hour. However, propeller planes with turboprop engines are more efficient in terms of fuel consumption and emissions.
Other factors that contribute to fuel efficiency include the aircraft's weight, engine maintenance, routing, and operational procedures. By improving these aspects, airlines can reduce fuel consumption and decrease their environmental impact.
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Jet fuel is kerosene-based, with high sulphur content
Jet fuel is primarily kerosene-based, with a high sulphur content. The kerosene used in jet fuel is distilled from crude oil, with a boiling range of 200-305°C, which overlaps with diesel fuel at the upper end. The sulphur content in jet fuel is reduced through a process called hydrotreating, which removes sulphur atoms by hydrogenating the heteroatom and producing a low-sulphur hydrocarbon product. This process also reduces other heteroatoms such as nitrogen and oxygen to low levels.
The use of kerosene-based jet fuel dates back to the end of World War II, when both British and American standards for jet fuel were established. The British standards were derived from the use of kerosene in lamps, while the American standards were based on aviation gasoline practices. Today, jet fuel continues to be kerosene-based due to its higher efficiency and power compared to gasoline. Kerosene has a higher flash point than gasoline, making it a safer option for aviation fuel.
The exact composition of jet fuel can vary depending on the petroleum source, and it is defined by performance specifications rather than a specific chemical compound. The range of molecular mass between hydrocarbons is determined by the requirements for the product, such as the freezing point or smoke point. For example, Jet A fuel is a type of kerosene-type jet fuel that must meet specific ASTM specifications, including a freezing point suitable for cold climates.
The aviation industry's demand for jet kerosene has increased, and refiners have optimized the yield of jet kerosene by varying process techniques and exploring alternative sources such as coal tar sands and synthetic blend stocks. The production of jet fuel involves blending the hydrotreated kerosene fraction from crude oil with the hydrocracked kerosene product derived from the heavier parts of crude. This blended product is then tested to ensure it meets the required specifications and includes any necessary additives.
While jet fuel is predominantly kerosene-based, there is a growing focus on sustainable aviation fuel (SAF) to reduce emissions and improve air quality. SAF is produced by blending renewable hydrocarbons derived from sources like corn ethanol and seed oils with petroleum-sourced jet fuel. The use of synthetic jet fuels, such as Fischer-Tropsch Synthesized Paraffinic Kerosene (SPK), is also increasing to reduce pollutants and improve air quality around airports.
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Shorter flights are less fuel-efficient per mile
The amount of fuel a plane uses depends on a variety of factors, including the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions. For example, a Boeing 747 burns approximately 1 gallon of fuel per second, or 18,000 gallons over a 5-hour flight. On the other hand, the Airbus A380, the largest passenger aircraft, consumes about 4,600 gallons of fuel per hour, or 23,000 gallons over a 5-hour flight.
While these numbers may seem high, when considering the number of passengers on board, the fuel efficiency per person can be quite good. For instance, the Boeing 747 can carry up to 568 people, and its fuel consumption works out to 0.01 gallons per person per mile, or 100 miles per gallon per person.
However, shorter flights are generally less fuel-efficient per mile compared to longer flights. This is because the fuel used during takeoff constitutes a significant portion of the total fuel consumption for shorter flights. Additionally, shorter flights often utilize less fuel-efficient regional jets. The worst-performing flights are typically those in the range of 500 to 1500 kilometers.
To improve fuel efficiency, operational procedures can be optimized, such as reducing the use of the Auxiliary Power Unit (APU) and implementing fuel-saving technologies like higher pressure ratios, geared turbofans, and advanced aerodynamics. Additionally, Airbus has explored the concept of flying aircraft in formation, taking advantage of wake updraft, which could potentially save 5-10% of fuel.
While aviation fuel consumption and emissions remain a concern, advancements in technology and operational procedures are being explored to improve fuel efficiency and reduce the environmental impact of air travel.
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New technology can reduce engine fuel consumption
The amount of fuel a plane burns depends on several factors, including the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions. For instance, a Boeing 747 burns approximately 1 gallon of fuel every second, which amounts to 18,000 gallons in a 5-hour flight. The Airbus A380, the largest passenger aircraft, consumes slightly more fuel, burning 4,600 gallons per hour or 23,000 gallons in 5 hours.
While aviation is responsible for a smaller share of CO2 emissions from the transport sector compared to road transport, it still faces pressure to reduce its environmental footprint. New technologies offer promising avenues to reduce engine fuel consumption and emissions in aircraft:
- Higher pressure and bypass ratios: The International Air Transport Association (IATA) technology roadmap projects a 10-15% reduction in engine fuel consumption through higher pressure and bypass ratios, with lighter materials implemented from 2010 to 2019.
- Geared turbofans: Using geared turbofans can lead to significant fuel savings. NASA estimates that advanced aerodynamics, structures, and geared turbofans could achieve up to 45% efficiency gains.
- Open rotors: Open rotors are another technology that can contribute to reducing fuel consumption in aircraft engines.
- Hybrid electric or fully electric propulsion: The progression of electric vehicles (EVs) has spurred interest in hybrid electric and fully electric propulsion systems for aircraft. Honeywell's hybrid-electric turbogenerator, for instance, runs partially on electricity, reducing the reliance on traditional fuel.
- Airframe efficiency: Improvements in airframe efficiency through retrofits, advanced aerodynamics, and better materials can enhance fuel efficiency. Winglets, riblets, and lightweight cabin furnishings are expected to reduce fuel consumption by 6-12%.
- Advanced materials: Carbon-fiber composites, for instance, are lighter than aluminum alloys. Using these composites instead of metal to build wings can decrease fuel consumption by 5%.
- Operational procedures: Adjustments in operational procedures can also lead to fuel savings. For instance, each 10-minute reduction in the use of the Auxiliary Power Unit (APU) saves 35 kg (77 lb) of fuel.
- Weight reduction: Every ounce of weight on an aircraft impacts fuel consumption. New technologies like 3D printing, carbon fiber materials, and shape memory alloys can reduce aircraft weight while improving customization and construction efficiency.
- Engine placement: The D8 design, which places engines on top of the plane body near the tail instead of under the wings, significantly reduces drag and boosts fuel efficiency.
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Frequently asked questions
The amount of fuel a plane uses every second varies depending on the type of plane, the number of passengers, the distance travelled, and other factors. On average, a Boeing 747 uses approximately 1 gallon (about 4 litres) of fuel every second.
Several factors affect how much fuel a plane uses, including the aircraft's empty weight, carried payload, efficiency of the engines, flight path, and weather conditions. Additionally, the stage of the flight can also play a role, with cruising typically being the most fuel-intensive stage, especially for longer flights.
The fuel efficiency of planes and cars can be compared in different ways. When considering fuel efficiency per person, planes can achieve higher mileage per gallon than cars, especially when the plane is at full capacity. However, when comparing fuel efficiency per vehicle, modern cars often have better fuel economy, especially over long distances.
