EVLN: 90% efficient Rolls-Royce e-airplanes ts:300mph

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EVLN: 90% efficient Rolls-Royce e-airplanes ts:300mph

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Rolls-Royce guns for electric airplane speed record
June 2, 2019  Eric C. Evarts


When most people think of Rolls-Royce, they think of ultra-luxury cars, not

But a separate Rolls-Royce, spun off of the automaker in 1971, makes
aircraft engines. And that company plans to go electric in tackling the
world speed record for electric airplanes. To borrow a famous phrase from
the automaker, if "horsepower is sufficient."

The company has built an all new airplane called ACCEL—"accelerating
electrification of flight"—to tackle the speed record attempt sometime in

The ACCEL project is part of a European Commission effort to clean up
emissions from air travel by 2050. The plane, and the record attempt are
part of a movement expanding electric-car technologies to the skies,
including electrifying helicopters and entire airlines. Long haul flight is
likely to take longer for electrification to take over.

Looking like a contender in the Reno air races, the ACCEL will use three
electric motors that produce a combined 500 horsepower.

They drive a low-rpm propeller designed to reduce noise and vibration.
Rolls-Royce says the powertrain is 90 percent efficient. The motors and
controller are made by YASA and Rolls is working with a startup electric
aircraft maker Electroflight for the record attempt.

Powering the motor is a 750-volt battery pack with 6,000 cells and liquid
cooling designed to withstand constant maximum loads during the record
attempt. Rolls-Royce did not cite its kilowatt-hour capacity.

Rolls-Royce doesn't just want to beat the speed record for electric flight
of 210 mph, set by Siemens in 2017, it aims to shatter it. The company hopes
the ACCEL will top 300 mph after it takes off on its record attempt at
Gloucestershire airport outside of Cheltenham, England next year.

In the meantime, the company will conduct flight trials throughout this year
working up to the speed record.

And it may end up breaking another record of its own—the 1931 Schneider
Trophy, set by a Supermarine S.6B that used a Rolls-Royce "R" engine to go
343 mph.
[© greencarreports.com]

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