SAMPE Journal - May/June 2021 - 33

Figure 7. Flow of the raw materials in the wing for the LRTM manufacturing case.

labour and equipment to the total wing cost.
The total costs have been normalized by the VBO
prepreg option to show the potential for savings
relative to a baseline civil aviation case. Moving to
a fully resin infused manufacturing method would
see a reduction in total wing cost of approximately
58%.
Analysis 3 also demonstrates a slight change
in the contribution of equipment to the total wing
cost for the fully-LRTM case, due to the requirement
of a second, flexible mould half. The labour
contribution to the total wing cost for Analysis 3
is also lower than the other cases, due to the use
of a higher areal weight fabric, which reduced the
number of layup operations during manufacturing.
The values of labour and equipment were in line
with predicted costs for similar length wind turbine
blades using resin infusion technology, however,
the significantly more expensive carbon fibre
fabric and prepreg materials results in the large
proportion of wing costs focused in the materials.
Materials Breakdown
The bottom-up approach of determining the
material costs for each in allows for easy tracking
of the usage of material during production. Figure
7 shows how the raw materials are distributed
among the different components in the wing.
The values are normalized by the total wing mass
and results are shown for the Analysis 3 case.
Approximately 7% of the total raw materials is lost
as scrap material, either as off-cuts from the fabric
cutting process step or as excess resin remaining in
feed lines after infusion.

w w w. s a m p e . o r g

May June 2021 Journal.indd 33

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SAMPE Journal - May/June 2021

Table of Contents for the Digital Edition of SAMPE Journal - May/June 2021

Table of Contents
SAMPE Journal - May/June 2021 - Cover1
SAMPE Journal - May/June 2021 - Cover2
SAMPE Journal - May/June 2021 - Table of Contents
SAMPE Journal - May/June 2021 - 2
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SAMPE Journal - May/June 2021 - Cover3
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