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The Rolls-Royce Trent XWB-84 is already the world’s most efficient aircraft engine, offering a 15% reduction in fuel burn and CO2 emissions compared to older engines. The Trent XWB-84 has been performing strongly since it entered commercial service in 2015, but the engine was later made even better by Rolls-Royce thanks to some minor modifications and enhancements that led to the creation of the Trent XWB-84 EP.
In this article, we will take a closer look at the Rolls-Royce Trent XWB-84 EP and examine the engine’s impressive attributes. We will also consider the role that the Trent XWB-84 EP might play in the wider aviation industry across the world.
The Rolls-Royce Trent XWB-84 EP
The Trent XWB-84 EP is Rolls-Royce’s most technologically advanced commercial aircraft engine ever and is designed to power the Airbus A350. Building on the success of its predecessor, the XWB-84, the ‘EP’ in the new variant’s name stands for Enhanced Performance, and it is clear to see why. The upgraded Rolls-Royce XWB-84 EP builds upon the already advanced technology of the XWB-84, incorporating lighter materials, as well as improved aerodynamics and cooling systems.
These enhancements contribute to a 1% fuel burn improvement compared to its predecessor, which, although seemingly small, results in significant fuel savings and reduced CO2 emissions throughout the aircraft’s lifetime. When multiplied across entire fleets, this is, of course, a major win, both environmentally and financially. The Rolls-Royce XWB-84 EP benefits from the manufacturer’s unique three-shaft construction, which allows for better optimization of the low, intermediate, and high-pressure systems.
This leads to improved overall performance. The engine also boasts advanced ceramic matrix composites and turbine blade cooling technologies, which both help to add to its overall impressive operational performance. The Rolls-Royce Trent XWB-84 EP entered commercial service in 2019 with 
Singapore Airlines on the carrier’s Airbus A350-900. At the time, the Head of Airbus’ Widebody Programme, Julien Puyou, celebrated the launch of the Trent XWB-84 EP, saying:
“With EASA’s certification of the Trent XWB‑84 EP to power the A350‑900, we strengthen the aircraft’s position as the long‑range leader. Together with our partner Rolls‑Royce, this latest evolution underscores our joint commitment to continuous improvement and innovation. The Trent XWB‑84 is already among the most efficient widebody engines on the market, and this enhanced version will deliver even greater performance and efficiency for our airline customers.”
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The Rolls-Royce Trent XWB-84
The Trent XWB-84 is Rolls-Royce’s original engine design for the Airbus A350 aircraft. The ’84’ in its name refers to the engine’s maximum take-off thrust of 84,000 lbfs. The XWB-84 is widely recognized as one of the most efficient commercial aircraft engines in service, delivering fuel burn improvements of around 15% compared to previous-generation engines in its class.
The Rolls-Royce Trent XWB-84 has a pressure ratio of 50:1, which was among the highest of any commercial engine when it was introduced. This high pressure ratio contributes to its low fuel consumption, which is critical for the long-range flights that the Airbus A350 often operates. Singapore Airlines operates what is currently the world’s longest non-stop commercial flight with its specially adapted A350-900ULRs between Singapore Changi Airport (SIN) and New York John F. Kennedy International Airport (JFK).
The specially adapted aircraft each feature an additional fuel tank for long journeys, and are fitted with only premium economy and business class cabins. Singapore Airlines also deploys its fleet of seven A350-900ULRs on nonstop services to Newark Liberty International Airport (EWR) and Los Angeles International Airport (LAX).
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All About The Airbus A350-900
The Rolls-Royce Trent XWB-84 engine family was designed to power the Airbus A350-900, which has proven to be one of the most popular widebody aircraft ever among both airlines and passengers. Among other aspects, this is thanks to its strong operational performance and superior onboard comfort.
The A350 entered commercial service in January 2015 with 
Qatar Airways, and since production began in 2010, more than 590 A350-900s have been delivered to airlines across the world. The latest data from ch-aviation shows that the world’s largest operator of the Airbus A350 is currently Singapore Airlines, with a total of 65 A350s in its fleet, made up of 58 A350-900s and seven A350-900ULRs.
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Competing With The General Electric GE9X
The closest competitor to the Rolls-Royce Trent XWB-84 EP is the General Electric GE9X, which is set to debut on the upcoming Boeing 777X. The GE9X is a high-bypass turbofan engine developed by GE Aerospace and is currently the world’s most powerful commercial engine, capable of generating 105,000 lbfs of thrust. Having proven itself in multiple recent test flights, it surpasses its predecessor, the GE90, in both size and efficiency, incorporating cutting-edge technologies to meet modern performance and environmental standards.
One of the key innovations in the General Electric GE9X is its composite fan blades, which help to reduce overall weight. The engine has a 134-inch fan diameter (the largest ever on a commercial engine) and a 10:1 bypass ratio, which significantly improves fuel efficiency and reduces noise. Thanks to this, the Boeing 777X is set to be the most fuel-efficient widebody aircraft when it enters commercial service, taking into account the high number of passengers that it can comfortably accommodate.
The manufacturers of the General Electric GE9X are currently winning when it comes to the world’s most powerful commercial engine, with 105,000 lbfs of thrust compared to up to 84,000 lbfs with the Rolls-Royce Trent XWB-84 EP. However, the latter incorporates some of the industry’s most advanced technologies, which means that it also has a very strong performance record.
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All About The Boeing 777X
Combining the advanced technology of the Boeing 787 with the high capacity of the 747 and 777, the Boeing 777X is Boeing’s latest widebody aircraft set to change the face of long-haul commercial aviation when it eventually enters commercial service. This was originally planned for 2020 but has since been pushed back six years after a number of setbacks, with the 777X’s first commercial flight now planned for 2027. The Boeing 777X is set to compete directly with the Airbus A350 and showcases several unique features, namely its folding wingtips.
These retractable wingtips allow the wings to be extended in flight to improve operational performance and fuel efficiency, while being retracted on the ground to allow the aircraft to operate within current airport configurations. This is in contrast to the mighty Airbus A380, which needed special modifications on the ramp and at the boarding gate in order to operate effectively when it was first introduced in 2007. Following the Boeing 777X’s maiden test flight in 2020, the US manufacturer’s President and CEO at the time, Stan Deal, said:
“Our Boeing team has taken the most successful twin‑aisle jet of all time and made it even more efficient, more capable and more comfortable for all.”
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Which Airlines Will Operate The Boeing 777X?
Perhaps unsurprisingly to many, the world’s largest operator of the Boeing 777X is set to be 
Emirates. The carrier, based at Dubai International Airport (DXB), is expecting to receive a total of 275 777Xs, made up of 35 777-8s and 235 777-9s. Some of the aircraft will likely be used to replace some of Emirates’ aging 777-300ERs, while others will allow for continued fleet expansion and growth.
The Rolls-Royce Trent XWB-84 EP gives the upcoming General Electric GE9X a run for its money in terms of fuel efficiency. However, it is unlikely to steal its crown anytime soon, as the former simply cannot beat the latter on sheer size and power. After all, the Boeing 777X is a large, high-capacity aircraft that needs a significant amount of thrust to get it off the ground. And if its engines can do that in a fuel-efficient, and therefore sustainable way, even better.
