Reviving supersonic passenger flights to harm environment: study https://www.reuters.com/article/us-airplane-supersonic-environment/reviving-supersonic-passenger-flights-to-harm-environment-study-idUSKBN1K70K9

1. 7/27/2018 Reviving supersonic passenger flights to harm environment: study | Reuters
https://www.reuters.com/article/us-airplane-supersonic-environment/reviving-supersonic-passenger-flights-to-harm-environment-study-idUSKBN1… 1/4
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If there has been some misunderstanding, I certainly hope that we can
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ENVIRONMENT
JULY 17, 2018 / 12:39 PM / 10 DAYS AGO
Reviving supersonic passenger flights to harm environment:
study
Jamie Freed
(Reuters) - Reviving supersonic passenger flights will harm the environment as the jets will
not likely be able to comply with existing fuel efficiency, pollution and noise standards for
subsonic aircraft, according to a study released on Tuesday.

2. 7/27/2018 Reviving supersonic passenger flights to harm environment: study | Reuters
https://www.reuters.com/article/us-airplane-supersonic-environment/reviving-supersonic-passenger-flights-to-harm-environment-study-idUSKBN1… 2/4
U.S. based startups Aerion Supersonic, Boom Supersonic and Spike Aerospace are all
aiming to revive ultra-fast flights by the mid-2020s by modifying existing engines rather
than spending billions of dollars to make a new one to serve a market that has been
dormant since Concorde stopped flying in 2003.
Modified engines will burn five-to-seven times more fuel per passenger than subsonic jets,
exceed global limits for new subsonic jets by 40 percent for nitrogen oxide and 70 percent
for carbon dioxide, the International Council on Clean Transportation (ICCT) said.
The ICCT said, based on its study, supersonic jet makers would be unlikely to meet
environmental standards unless they used a new engine design with technology like a
variable cycle that would operate differently at take-off than in cruise mode.
The alternative is for policymakers to ease standards for supersonic jets, the ICCT adds.
The United States is already pushing for different standards for ultra-fast planes but facing
resistance from European nations that want tough rules on noise.
“There are reasons to be worried about the environmental impact of reintroducing
supersonic aircraft,” said Daniel Rutherford, aviation director at the U.S.-based
independent non-profit research organization.
“A modest first step is for manufacturers to commit to meeting existing standards for new
aircraft,” added Rutherford, a co-author of the ICCT study.
ENGINE HEADWINDS
FILE PHOTO: The Aerion AS2, the world's first supersonic business jet, being developed by Lockheed Martin Corp
partnering with plane maker Aerion Corp of Reno, Nevada, is shown in this handout photo illustration released
December 15, 2017. Aerion Corporation/Handout via REUTERS

3. 7/27/2018 Reviving supersonic passenger flights to harm environment: study | Reuters
https://www.reuters.com/article/us-airplane-supersonic-environment/reviving-supersonic-passenger-flights-to-harm-environment-study-idUSKBN1… 3/4
But finding an efficient engine for supersonic jets is tough in an industry that has for
decades been catering to subsonic planes by improving fuel efficiency, expanding range and
reducing noise through the use of larger fans.
Supersonic jets are most efficient at cruising altitude with smaller engines that are far
noisier on takeoff, like those on fighter jets or old 727s that do not meet modern airport
noise standards. Smaller engines help reduce aerodynamic drag when flying above mach
speed - the speed of sound.
Lockheed Martin Corp (LMT.N)-backed Aerion has selected a GE (GE.N) engine core
used in F-16 fighter jets and Boeing Co (BA.N) 737s as the basis for the engine on its
planned jet, which will have a top speed of Mach 1.4.
Boom and Spike, which plan top speeds of Mach 2.2 and Mach 1.6 respectively, have yet to
select engines.
LMT.N GE.N BA.N
Lockheed Martin Corp 322.94
LMT.N NEW YORK STOCK EXCHANGE -1.42 (-0.44%)

4. 7/27/2018 Reviving supersonic passenger flights to harm environment: study | Reuters
https://www.reuters.com/article/us-airplane-supersonic-environment/reviving-supersonic-passenger-flights-to-harm-environment-study-idUSKBN1… 4/4
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“Even if you built something new, I think you are going to be struggling,” said Daniel
Edgington-Mitchell, an aerospace engineering lecturer at Melbourne’s Monash University.
“I think that is why there is such a push in the United States to reconsider the standards
particularly for supersonic aircraft because it is just going to be really difficult.”
Reporting by Jamie Freed in Singapore, additional reporting by Allison Lampert in Montreal; Editing by
Himani Sarkar
Our Standards: The Thomson Reuters Trust Principles.