Sylvie Willis
The fuel economy of an aircraft is a measure of its transport energy efficiency. Fuel efficiency is increased by improving aerodynamics, reducing weight, and improving engine brake-specific fuel consumption. The Airbus A321, featuring Sharklet wingtip devices, consumes 2.2 L/100 km (110 mpg-US) per person with a 200-seat layout. The A321neo, one of the newest aircraft, uses an average of 2.7 litres of fuel per kilometre. To minimise fuel consumption, an aircraft should cruise at the highest possible altitude while still maintaining sufficient lift.
| Characteristics | Values |
|---|---|
| Fuel consumption per kilometre | 2.7 litres |
| Fuel consumption per kilometre with Sharklet wingtip devices | 2.2 L/100 km (110 mpg-US) per person with a 200-seat layout |
| Fuel consumption per hour | 2,450 kg for an 80-tonne aircraft |
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What You'll Learn
Fuel efficiency
The Airbus A321 is one of the newest aircraft, with an average fuel efficiency of 2.7 litres of fuel per kilometre. This can also be calculated as 2.2 litres of fuel per 100 kilometres per person, with a 200-seat layout. This is a significant improvement compared to older aircraft, with the average fuel burn of new aircraft falling 45% from 1968 to 2014, and continuing to improve.
The fuel efficiency of an aircraft depends on several factors, including the aircraft's fleet fuel burn, seating density, air cargo, and passenger load factor. Operational procedures such as maintenance and routing can also impact fuel efficiency. For example, an aircraft can save fuel by cruising at a higher altitude, where air density is lower, reducing drag. However, higher altitudes also result in decreased air pressure and temperature, which reduces the maximum power or thrust of aircraft engines. Therefore, the aircraft's cruise altitude should be close to the maximum altitude at which it can generate sufficient lift to maintain its altitude.
Furthermore, the fuel efficiency of an aircraft can be improved by using more fuel-efficient engines, lighter composite material airframes, more aerodynamic shapes, and winglets. More advanced computer systems can also optimise routes and aircraft loading to improve fuel efficiency. These improvements can result in significant emission savings, as seen with the Boeing 787, which has 20% lower emissions compared to conventional aluminium airliners.
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Optimum altitude
The optimum altitude for fuel efficiency is usually higher. As an aircraft's weight decreases throughout the flight due to fuel burn, its optimum cruising altitude increases. Air density decreases with altitude, lowering drag. However, air pressure and temperature decrease with altitude, reducing the maximum power or thrust of aircraft engines. Thus, to minimize fuel consumption, an aircraft should cruise close to the maximum altitude at which it can generate sufficient lift to maintain its altitude.
The Airbus A321, featuring Sharklet wingtip devices, consumes 2.2 L/100 km (110 mpg-US) per person with a 200-seat layout for WOW Air. The fuel burn per kilometre does not reflect the relative aircraft size and capacity. The A321neo, one of the newest aircraft, uses an average of 2.7 litres of fuel per kilometre.
The average fuel burn of new aircraft fell 45% from 1968 to 2014, a compounded annual reduction of 1.3%. Fuel efficiency is increased with better aerodynamics and by reducing weight, and with improved engine brake-specific fuel consumption and propulsive efficiency or thrust-specific fuel consumption. For example, in early 2006, Scandinavian Airlines started flying slower, from 860 to 780 km/h, to save on fuel costs and curb carbon dioxide emissions.
The fuel economy of an aircraft is the measure of the transport energy efficiency of the aircraft. An airline's efficiency depends on its fleet fuel burn, seating density, air cargo and passenger load factor. Operational procedures like maintenance and routing can also save fuel.
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Fuel economy
The Airbus A321 is one of the newest aircraft and is considered to be highly fuel-efficient. It consumes 2.2 L/100 km (110 mpg-US) per person with a 200-seat layout for WOW Air. It features Sharklet wingtip devices, which improve fuel efficiency. The average fuel burn of new aircraft fell 45% from 1968 to 2014, a compounded annual reduction of 1.3% with a variable reduction rate.
The fuel consumption of an aircraft also depends on its capacity, age, and engine type. For example, the A380 aircraft uses almost 14 litres of fuel per kilometre, while the newer A350 uses just 6.0 litres, and the A319 uses even less. The A321neo, one of the newest aircraft, uses an average of 2.7 litres of fuel per kilometre.
The phase of flight that burns the most fuel is take-off, as the engines are working at their maximum capacity to generate the thrust required to lift the aircraft off the ground. However, the climb and cruise phases of flight also contribute significantly to fuel burn, especially on longer flights. To minimize fuel consumption, an aircraft should cruise at a higher altitude where the air density is lower, reducing drag. As the aircraft's weight decreases due to fuel burn, it can cruise at a higher altitude, further reducing fuel consumption.
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Fuel burn per kilometre
The fuel burn per kilometre of an aircraft depends on various factors such as aircraft capacity, age, and engine type. The Airbus A321, featuring Sharklet wingtip devices, consumes 2.2 L/100 km (110 mpg-US) per person with a 200-seat layout for WOW Air. This is a significant improvement compared to older aircraft, with new aircraft models being 20% more fuel-efficient per passenger kilometre.
The A321neo, one of the newest aircraft in the A320 family, uses an average of 2.7 litres of fuel per kilometre. This is a notable improvement over older models such as the A380, which burns twice as much fuel per hour as the Boeing 787-9. The fuel efficiency of the A321neo contributes to its popularity among airlines and passengers alike.
While take-off is often considered the most fuel-intensive part of a flight, it contributes a relatively small fraction of total fuel usage. The cruise phase, which varies depending on the flight duration and distance, typically accounts for the highest fuel burn. For example, on the longest flight analysed, to Hong Kong, cruising accounted for 96% of the total fuel burned. However, on shorter flights, such as the one to Paris, cruising accounted for only 62% of the overall fuel burn.
The fuel burn per kilometre is also influenced by the weight of the aircraft, which decreases throughout the flight due to fuel burn. This, in turn, impacts the optimum cruising altitude, with higher altitudes improving thermal efficiency. Additionally, factors such as aircraft speed and the use of advanced technologies can further impact fuel efficiency. Overall, the A321neo offers impressive fuel efficiency, contributing to its environmental and economic advantages in the aviation industry.
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Fuel burn per hour
The fuel burn rate of an aircraft depends on several factors, including the aircraft's weight, altitude, airspeed, seating density, cargo and passenger load. The take-off phase of a flight typically involves the highest fuel consumption rate, as the aircraft's engines operate at maximum thrust.
The Airbus A321 is a fuel-efficient aircraft, featuring Sharklet wingtip devices that improve aerodynamics and reduce drag. According to one source, the A321 burns approximately 1/33 of its weight per hour under standard conditions, at a near-optimal altitude, and with a long-range cruise configuration. For an aircraft weighing 80 tons, this equates to approximately 2.45 tons of fuel burned per hour.
Another source provides a slightly lower estimate, stating that the A321 burns around 2 tons of fuel per hour on sectors shorter than two hours, with a slightly higher burn rate when fully fuelled. The burn rate can also vary depending on the aircraft's weight and speed, with a lower weight and speed resulting in a reduced fuel burn.
To put this into perspective, the Airbus A321, with a 200-seat layout for WOW Air, consumes 2.2 L/100 km (110 mpg-US) per person. This is significantly more fuel-efficient than the older Airbus A380, which burns twice as much fuel per hour as the Boeing 787-9.
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Frequently asked questions
An Airbus A321 burns approximately 1/33 of its weight per hour in ISA conditions, LRC at a (near) optimum altitude. For a weight of 80 tons, it will burn approximately 2.45 tons per hour.
The A321neo, one of the newest aircraft, uses an average of 2.7 litres of fuel per kilometre.
The Airbus A321 featuring Sharklet wingtip devices consumes 2.2 L/100 km (110 mpg-US) per person with a 200-seat layout for WOW Air. In comparison, the Boeing 787 is more fuel-efficient due to its engine and lighter composite material airframe.
While take-off may be the most intense point of a flight in terms of fuel consumption, other factors such as aircraft capacity, age, and engine type also contribute significantly to relative fuel burn.
