Introducing ACCEL | Rolls-Royce

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Introducing ACCEL

The world’s fastest electric-powered aeroplane

Rolls-Royce is leading a highly specialised challenge to build the world’s fastest all-electric aircraft

This zero-emissions plane is expected to make a run for the record books with a target speed of 300+ MPH (480+ KMH).

Inside a bustling hangar bay at the far end of Gloucestershire airport in South West England, a team of British engineers, designers, and data specialists recruited from across Rolls-Royce and beyond have set out to make history.

They’re building a high-performance electric aeroplane unlike anything the world has ever seen. Scheduled to take to the skies over Great Britain in 2020, the aircraft will reach a speed of 300 mph – and quite likely more – making it the fastest all-electric plane in history.

This run for the record books is no stunt. It’s part of a Rolls-Royce initiative called ACCEL – short for “Accelerating the Electrification of Flight” – that’s intended to pioneer a third wave of aviation in support of Rolls-Royce’s strategy to champion electrification.

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ACCEL partners

ACCEL is partly funded by the UK government and involves a host of partners including electric motor and controller manufacturer YASA and the aviation start-up Electroflight.

The team brings together some of the top minds from the world of Formula E racing to help design the e-racer.

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ACCEL is nothing less than a revolutionary step change in aviation

"This plane will be powered by a state-of-the-art electrical system and the most powerful battery ever built for flight. In the year ahead, we’re going to demonstrate its abilities in demanding test environments before going for gold in 2020 from a landing strip on the Welsh coastline."

Matheu Parr

ACCEL Project Manager for Rolls-Royce

With a heritage rich in innovation and world-firsts, Rolls-Royce is no stranger to such competitions.

The company was instrumental in helping Britain win the prestigious Schneider Trophy in 1931, a victory that established Rolls-Royce as a leader in aerospace. The British racing seaplane that established the record was known as the Supermarine S.6B. Powered by a Rolls-Royce “R” engine, it maxed out at 343 mph that day. By comparison, the current record for an all-electric plane, set by Siemens in 2017, is 210 mph. Parr and his team want to blow the doors off the modern e-flight mark – and they even have their eyes on the Supermarine record.

Doing so will require overcoming a series of unique challenges. They’ll need to build an immense battery that’s powerful enough to beat a series of speed and performance records, light enough to fly, and stable enough not to overheat. “We’re monitoring more than 20,000 data points per second, measuring battery voltage, temperature, and overall health of the powertrain, which is responsible for powering the propellers and generating thrust. We’ve already drawn a series of insights from the unique design and integration challenges,” says Parr. “And we’re gaining the knowhow to not only pioneer the field of electric-powered, zero-emissions aviation – but to lead it. At this point, our confidence is sky high.”

Here’s a closer look at some of ACCEL’s key components and innovations

Accel has the most energy-dense battery pack ever assembled for an aircraft, providing enough power to fly 200 miles (London to Paris) on a single charge.

The world's most energy-dense flying battery pack

Accel has the most energy-dense battery pack ever assembled for an aircraft, providing enough power to fly 200 miles (London to Paris) on a single charge.

Its 6,000 cells are packaged for maximum lightness and thermal protection. An advanced cooling system can withstand the extreme temperatures and high-current demands during flight.

The propeller is driven by three high power density electric motors designed and manufactured by YASA in the UK.

ACCEL will utilise three 750R lightweight e-motors

The propeller is driven by three high power density electric motors designed and manufactured by YASA in the UK.

Compared to a conventional plane, the propeller blades spin at a far lower RPM to deliver a much more stable and far quieter ride. Combined they’ll continuously deliver more than 500 horsepower for the record run.

The all-electric powertrain will run at 750 volts and delivers 90% energy efficiency with zero emissions.

The Powertrain is the key to achieving 90% energy effiency & zero-emission flight

The all-electric powertrain will run at 750 volts and delivers 90% energy efficiency with zero emissions.

For safety and performance optimisation purposes, sensors will collect in-flight information each second across more than 20,000 points on the powertrain, measuring battery voltage, temperature and general performance metrics.