Rajan Wilcox
The Boeing 787 Dreamliner is a long-range, mid-size, twin-engine jet airliner that was developed by Boeing Commercial Airplanes. It is the company's most fuel-efficient airliner, designed to be 20% more fuel-efficient than the Boeing 767. The 787 can carry 200 to 335 passengers on routes up to 8,500 nautical miles, and its fuel capacity is 33,340 US gallons.
| Characteristics | Values |
|---|---|
| Total fuel capacity | 33,340 US gallons |
| Number of passengers | 200 to 335 |
| Range | 8,500 nautical miles |
| Engine | Rolls-Royce Trent 1000 or General Electric GEnx |
| Fuel efficiency | 20% more fuel-efficient than the 767 |
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What You'll Learn
The 787 Dreamliner can carry 55,800 US gallons of fuel
The 787 Dreamliner is a long-range, mid-size wide-body, twin-engine jet airliner developed by Boeing Commercial Airplanes. It is Boeing's most fuel-efficient airliner, designed to be 20% more fuel-efficient than the Boeing 767. The 787 Dreamliner can carry 55,800 US gallons of fuel. To put that into perspective, it takes 53 minutes to load this amount of fuel with two fuel trucks operating at 35 psi delivery pressure. The Dreamliner's fuel efficiency is due in part to its use of composite materials as the primary material in the construction of its airframe, as well as its extensive wind tunnel testing during the design phase.
The 787 Dreamliner's distinguishing features include mostly electrical flight systems, swept wingtips, and noise-reducing chevrons on its engine nacelles. The aircraft's initial designation was the 7E7, prior to its renaming in January 2005. The first 787 was unveiled in a roll-out ceremony on July 8, 2007, at Boeing's Everett factory. At launch, the 787 was targeted to have 20% less fuel burn compared to aircraft like the Boeing 767. It can carry 200 to 300 passengers on point-to-point routes up to 8,500 nautical miles.
The 787-8 is a variant of the Dreamliner that typically seats 248 passengers over a range of 7,305 nautical miles. Its total fuel capacity is 33,340 US gallons, which would take approximately 31.6 minutes to fill with two fuel trucks. This variant is 186 feet long and has a maximum takeoff weight of 502,500 pounds. The 787-8 and its larger counterpart, the 787-9, were designed to have a certified 330-minute ETOPS capability.
The 787 Dreamliner is powered by either the Rolls-Royce Trent 1000 or the General Electric GEnx engine. These engines contribute to approximately 40% of the aircraft's fuel efficiency gains, with the remaining gains attributed to aerodynamic improvements, increased use of lightweight composite materials, and advanced systems. The extensive structural testing of the airframe during the design phase ensured the safety and performance of the 787 Dreamliner.
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It takes 31.6 minutes to fill the 787-8 with 33,340 US gallons of fuel
The Boeing 787 Dreamliner is a long-range, mid-size, twin-engine jet airliner. It is the company's most fuel-efficient aircraft and was designed to be 20% more fuel-efficient than the 767. The 787-8 variant of the Dreamliner has a total fuel capacity of 33,340 US gallons. According to Boeing, it takes 31.6 minutes to fill the 787-8 with 33,340 US gallons of fuel, assuming a fuel delivery pressure of 35 psi and the use of two fuel trucks.
The 787 Dreamliner is a pioneering airliner in terms of its construction, as it is the first to have an airframe made primarily of composite materials. This contributes to its fuel efficiency, along with the use of advanced systems and aerodynamic improvements. The extensive use of composite materials also reduces the weight of the aircraft, further enhancing its fuel efficiency.
The 787-8 typically seats 248 passengers and has a range of 7,305 nautical miles (13,529 km or 8,406 mi). It is part of the 787 family, which includes other variants such as the 787-10, seating up to 440 passengers, and the initial 186-foot-long (57 m) model. The 787 program has been a significant investment for Boeing, with an estimated break-even point of 1,300 to 2,000 aircraft sales.
The process of fuelling an aircraft like the 787-8 is a well-coordinated operation involving specialised equipment and trained personnel. The fuel trucks used in the process are designed to efficiently transfer large volumes of fuel to the aircraft, ensuring that it can be ready for its next journey as quickly as possible. The time it takes to fuel an aircraft can vary depending on factors such as the capacity of the fuel trucks, the pressure at which the fuel is delivered, and the efficiency of the fuelling system.
The 31.6-minute fuelling time for the 787-8 is a testament to the efficiency of the fuelling process and the specialised equipment involved. It ensures that the aircraft can be prepared for its upcoming journey promptly, minimising delays and maximising the utilisation of the aircraft. This quick turnaround time is crucial for airlines to maintain their schedules and optimise their operations, especially during busy periods at airports with high traffic volumes.
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The 787 is 20% more fuel-efficient than the 767
The Boeing 787 Dreamliner is a highly fuel-efficient aircraft, designed to surpass its predecessor, the 767, in terms of fuel economy. One of the key advantages of the 787 is its fuel efficiency, with Boeing targeting a 20% reduction in fuel burn compared to the 767. This improvement is achieved through a combination of advanced engines, aerodynamic enhancements, and the use of lightweight composite materials.
The 787's engines, the Rolls-Royce Trent 1000 and General Electric GEnx, contribute significantly to its fuel efficiency. These engines are approximately 7% more efficient than those used on the 767, according to academic sources. Additionally, the extensive use of composite materials in the 787's construction makes it lighter, further contributing to fuel savings.
While the 787 has shown impressive fuel efficiency gains, some operators have reported varying results. Air India, for example, claimed that their 787 fleet did not achieve the expected 20% fuel efficiency improvement, falling short at around 15%. On the other hand, All Nippon Airways (ANA) reported surpassing the promised 20% fuel burn reduction compared to the 767.
The fuel efficiency of the 787 also depends on various operational factors, such as passenger load, cargo weight, and flight conditions. For instance, the 787's efficiency advantage may be impacted when flying with a full passenger load and freight, as in the case of ANA's transpacific routes. Additionally, the layout of the cabin and seating configuration can influence fuel efficiency, with tighter seating arrangements potentially impacting overall efficiency.
Despite some variations in reported fuel efficiency, the 787 remains a highly competitive aircraft in terms of fuel economy. It offers a significant improvement over older models, and its efficiency contributes to reduced operating costs and environmental impact. Furthermore, Boeing continues to innovate, with upcoming releases like the 777X series expected to raise the bar even higher for fuel efficiency and overall performance.
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The 787's airframe is made of composite materials, reducing weight
The Boeing 787 Dreamliner is a long-range, mid-size, wide-body, twin-engine jet airliner. It is the company's most fuel-efficient airliner, designed to be 20% more fuel-efficient than the 767. The 787 can carry 200 to 300 passengers on point-to-point routes up to 8,500 nautical miles (15,700 km; 9,800 mi).
The 787 is the first airliner with an airframe primarily made of composite materials. Its fuselage is made of one-piece composite barrel sections, rather than the multiple aluminium sheets and fasteners used on previous aircraft. This innovative design reduces weight and improves fuel efficiency. The extensive use of composite materials in the 787's airframe contributes significantly to its overall efficiency, making it a pioneering aircraft in the industry.
The benefits of composite materials in aircraft construction are significant. Composites offer a higher strength-to-weight ratio than traditional aluminium, resulting in a lighter aircraft. This weight reduction directly contributes to improved fuel efficiency, as a lighter plane requires less fuel to cover the same distance. Additionally, composites provide improved fatigue and corrosion resistance, leading to reduced maintenance costs and extended service life.
The use of composite materials in the 787's airframe also allows for more efficient manufacturing processes. The one-piece composite barrel sections reduce the need for complex assembly, resulting in streamlined production and potential cost savings. Furthermore, composites offer design flexibility, enabling engineers to optimise the aircraft's shape for improved aerodynamics, further enhancing fuel efficiency.
The 787's total fuel capacity is 33,340 US gallons for the 787-8 variant. With two fuel trucks operating at 35 psi delivery pressure, it takes approximately 31.6 minutes to fill the plane's tanks from empty to full. The use of lighter-weight composite materials in the 787's airframe contributes to its impressive fuel efficiency, enabling it to carry a substantial fuel load while maintaining its exceptional performance characteristics.
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Early 787s were overweight, increasing fuel burn
The Boeing 787 Dreamliner was designed to be 20% more fuel-efficient than the 767, with 40% of that efficiency gain coming from the engines, and the rest from aerodynamic improvements, increased use of lightweight composite materials, and advanced systems. However, early-built 787s (line numbers under 20) were overweight, increasing their fuel burn and reducing their maximum range. This issue caused some carriers to opt for later aircraft. Boeing struggled to sell these early models, eventually offering significant discounts, and even scrapping one. Nicknamed the "Terrible Teens", these early 787s were missing many major systems at launch, with parts attached using temporary non-aerospace fasteners that would need to be replaced later.
A press report in May 2009 indicated a 10-15% range reduction for early aircraft that were about 8% overweight. This meant a range of 6,900 nmi (12,800 km; 7,900 mi) instead of the originally promised 7,700 to 8,200 nautical miles (14,300 to 15,200 km; 8,900 to 9,400 mi). Substantial redesign work was expected to address this issue, which would also complicate any increases in production rates. As a result, some airlines delayed deliveries of 787s to take later planes that may be closer to the original estimates.
Boeing expected to have the weight issues addressed by the 21st production model. After its first six months of service, Rolls-Royce-powered ANA aircraft were burning around 21% less fuel than the replaced 767-300ER on international flights, and 15-20% less on domestic routes. Other 787 operators have reported similar fuel savings, ranging from 20 to 22% compared to the 767-300ER.
In 2021, a user on Reddit reported that the fuel burn issue with the 787 had been fixed, with fuel usage being as expected. However, another user commented that they had experienced a different issue with fuel burn, burning less than 10% of fuel after four hours in flight, which they considered unrealistic.
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Frequently asked questions
The total fuel capacity of the 787-8 is 33,340 US gallons.
It takes 31.6 minutes to load 33,340 US gallons with two fuel trucks operating at 35 psi delivery pressure.
The 787 is Boeing's most fuel-efficient airliner and was designed to be 20% more fuel-efficient than the Boeing 767.
The 787 can carry 200 to 335 passengers depending on the variant and seating configuration.
The 787 Dreamliner's distinguishing features include mostly electrical flight systems, swept wingtips, and noise-reducing chevrons on its engine nacelles.
