FUSION Issue 3-2026 DIGITAL - Flipbook - Page 7
Scaling SAF to the volumes aviation needs
will require feedstock diversification and
the commercial maturation of production
pathways that are currently still expensive and
relatively unproven at scale.
Where composites fit in
The connection between SAF and composite
manufacturing is not immediately obvious, but
it is real and it matters.
Every kilogram removed from an aircraft structure
reduces the fuel that aircraft burns across its
entire service life. With conventional jet fuel, the
economics of lightweighting are compelling. With
SAF, which costs significantly more per tonne
than conventional fuel, the economics become
even more powerful. An aircraft that burns less
fuel requires less SAF to operate within a given
emissions budget. In a world where SAF supply is
severely constrained and commands a significant
price premium, the most fuel-efficient aircraft
are the most commercially viable aircraft. And
fuel efficiency, at the structural level, is largely a
composites story.
The next generation of single-aisle commercial
aircraft, the programmes that will dominate
the market through the 2030s and beyond, will
be built with substantially higher composite
content than the current generation. Carbon
fibre reinforced polymer in primary structures,
composite fan blades, composite nacelles and
fairings: the direction of travel is clear. Each
incremental increase in composite content
reduces structural weight. Each reduction in
structural weight reduces fuel burn. In the
context of the SAF challenge, that weight
reduction has a direct and quantifiable value
that goes well beyond the conventional fuel
saving calculation.
The aerostructure challenge
There is a further dimension that is less widely
discussed. The aircraft currently in service were
designed and certified for conventional jet fuel.
The transition to SAF blends, and eventually
to 100 per cent SAF where regulations and
technology permit, raises questions about
material compatibility that the composites and
coatings community is well positioned to answer.
Current regulations permit SAF blends of
up to 50 per cent in standard JET A-1 fuel.
Airbus, Boeing, and engine manufacturers
including Safran and TotalEnergies are actively
working towards certifying 100 per cent SAF
operation. As fuel chemistry changes, the
interaction between fuel and aircraft materials,
including sealants, coatings, composite resins,
and adhesives, needs to be understood and
validated. This is not a theoretical concern.
It is an active area of engineering work, and
the expertise sits largely within the advanced
materials and surface engineering community
that Fusion readers represent.
The mandate landscape
is shifting
For UK aerospace manufacturers and their
supply chains, the policy environment is
becoming more structured. The UK SAF
mandate requires an increasing blend percentage
from 2026, with targets escalating through
the decade. The Farnborough Aerospace
Consortium's most recent industry analysis
identifies the SAF mandate as one of the key
strategic signals shaping where future value
will be created in UK aerospace manufacturing,
alongside the Future Flight Programme and the
Global Combat Air Programme.
What this means practically is that the pressure
on aircraft manufacturers to deliver more fuelefficient platforms will only increase. Airlines
paying a premium for SAF have an even stronger
commercial incentive to operate aircraft that
burn less of it. The demand signal for lighter,
more efficient aerostructures is not softening. It
is hardening, and the timeline is compressing.
The bigger picture
SAF will not solve aviation's emissions challenge
on its own, and the current production numbers
make that abundantly clear. Hydrogen propulsion,
electric aviation for shorter routes, and further
aerodynamic and structural efficiency gains all
have a role to play. But SAF is the only solution
that works in existing aircraft, with existing
infrastructure, at meaningful scale in the near
term. That makes it indispensable, even if the
path to the required volumes remains daunting.
For the composites and advanced
manufacturing sector, the message is not one
of alarm. It is one of relevance. The pressure on
aviation to decarbonise is creating sustained,
long-term demand for lighter structures,
more efficient manufacturing processes, and
materials that perform reliably in a changing
fuel environment. The businesses best placed
to support the next generation of commercial
and defence aircraft are those investing now
in the manufacturing capability, process
discipline, and materials knowledge that those
programmes will require.
“ In a world where SAF
commands a significant
price premium, the most
fuel-efficient aircraft are
the most commercially
viable. And fuel efficiency,
at the structural level, is
largely a composites story. ”
dtc-uk.com
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