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 Coast-Line International Your One Stop Tech Shop *Woven Cloth & Prepreg *Film Adhesives *Sealants *Core Splice *Potting Compound *Hot Bonders *Vacuum Bag & Release Film *Breather *Tooling Materials *Connections *Vacuum Pumps *Infusion Resins *Core Material *Specialty Tapes *Clean Room Consumables *Penetrants Stocking Locations in NY, GA, MA With Same Day Shipping Ph: 631-226-0500 ~ Fax: 631-226-5190 email@coast-lineintl.com ~ www.coast-lineintl.com M AY/J U N E 2 0 2 1 | SAMPE JOURNAL | 33 4/8/2021 12:32:32 PMhttp://www.coast-lineintl.com http://www.sampe.org