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where aviation has zero climate impact. We
created Cascade on a foundation of credible
data and analytical models to allow users
to explore various pathways to net-zero. We
think this model will help our industry visual-
ize, for the first time, the real climate impact
of each solution, from beginning to end, and
to inform the most probable and effective
strategies.”

The Cascade model assesses the full lifecycle
impacts of renewable energy by accounting
for the emissions required to produce, distrib-
ute and use alternative energy carriers such
as hydrogen, electricity, and SAF. Boeing plans
to utilize the incredibly powerful Cascade tool
with airline operators, industry partners, and
policymakers to inform when, where, and how pathways and aerodynamic configurations in order to support
different fuel sources intersect with new air- the Company’s ambition of leading the way in the decarbonisa-
plane designs. tion of the entire aviation industry.

“We have to take a holistic view to decar- At the launch, Airbus CEO Guillaume Faury said: “This is a historic
bonization,” said Raymond. “And when we moment for the commercial aviation sector as a whole and we
do that, it is clear that sustainable aviation intend to play a leading role in the most important transition
fuel (SAF) is a necessary lever. We know it will this industry has ever seen. The concepts we unveil today offer
take a ‘SAF and’ approach and not a ‘SAF or’ the world a glimpse of our ambition to drive a bold vision for the
approach to achieving net-zero by 2050.” future of zero-emission flight.”

“I strongly believe that the use of hydrogen – both in synthetic
Early Start fuels and as a primary power source for commercial aircraft – has
Since the mid-2000s, Boeing has conducted the potential to significantly reduce aviation’s climate impact.”
six hydrogen technology demonstrations with Proposed Concepts for Hydrogen Powered Commercial
crewed and uncrewed aircraft using hydro-
gen fuel cells and combustion engines. Last Aircraft:
year, Boeing successfully tested a cryotank • A turbofan design (120-200 passengers) with a range of
designed for space with the capacity to hold 2,000+ nautical miles, capable of operating trans-conti-
16,000 gallons of liquid hydrogen or the nentally and powered by a modified gas-turbine engine
energy equivalent of the Jet A fuel in a typi-
cal regional jet. running on hydrogen. The liquid hydrogen will be stored
and distributed via tanks located behind the rear pres-
And Boeing intends to share its Cascade work sure bulkhead.
with Brian Yutko, Boeing chief engineer and
vice president of Sustainability and Future •A turboprop design (up to 100 passengers) using a tur-
Mobility, saying “our common goal is to boprop engine instead of a turbofan and also powered
enable the societal benefits of air transpor- by hydrogen combustion in modified gas-turbine engines,
tation while reaching zero climate impact on which would be capable of travelling more than 1,000
our planet. To make that a reality, we believe nautical miles, making it a perfect option for short-haul
it is best to learn and share our findings trips.
broadly, based on a foundation of data, sci-
entific research and collaboration, as we work •A “blended-wing body” design (up to 200 passengers)
together to decarbonize aviation.” concept in which the wings merge with the main body
In October 2020, Airbus shocked the aviation of the aircraft with a range similar to that of the turbo-
world unveiling three radical hydrogen pow- fan concept. The exceptionally wide fuselage opens up
ered aircraft and is pouring resources into multiple options for hydrogen storage and distribution,
getting one or more designs into service by and for cabin layout.
2035. “These concepts will help us explore and mature the design and
Each hydrogen-powered design represents layout of the world’s first climate-neutral, zero-emission commer-
a different approach to achieving zero-emis- cial aircraft, which we aim to put into service by 2035,” said Faury.
sion flight, exploring various technology
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