## 3 Results and Discussion  
The structural design of motorcycle fairings demands a detailed analysis of the configuration of jute fiber layers, as the laminar arrangement determines the mechanical strength and rigidity of the component [13]. Figures 3 and 4 show the specimens for the experimental tests; tensile strength is paramount, as it correlates with the fairing's ability to withstand dynamic forces in operation, contributing to aerodynamic stability and structural integrity [31]. Regarding impact resistance, its importance is accentuated in collision scenarios, where a sturdy fairing can mean the difference between minor or major damage for both the rider and the motorcycle, acting as a crucial protective barrier [4]. Tensile strength is crucial, as it relates to the fairing's ability to withstand dynamic forces during operation, contributing to both aerodynamic stability and structural integrity [32]. Therefore, the appropriate selection of the number of layers and the understanding of tensile and impact properties enhance performance and are also essential for safety in motorcycle engineering. The testing results are shown in Table 6, presenting the tensile and impact behavior of the composite material.  
Tensile and impact tests conducted on jute fiber composites reveal that a volumetric fraction of 26.7% provides an optimal balance between strength and energy absorption, with an average maximum stress of 42.94 MPa and impact energy of 16.83 kJ/m\({}^{2}\). This balance is crucial for motorcycle fairings, which must withstand significant forces during everyday use and provide protection in impact situations. The selection of this volumetric fraction is key to developing fairings that meet aesthetic and performance standards and enhance the overall safety of the vehicle.  
In the comparison of jute fiber-reinforced epoxy composite and the same 90 and 0 deg fiber orientation, a key distinction in mechanical behavior attributable to differences in weave architecture and laminate thickness is observed. While composites with \"mesh\" weave in this research show a tendency towards higher displacement at maximum load, reflecting increased ductility and deformation capacity under applied loads, results obtained by [PERSON] [11], with \"twill\" weave, exhibit higher maximum stress values despite having a lower thickness; this can be inferred from Table 7.  
Woven jute fiber with an estimated weight of 106.67 g/m\({}^{2}\) was used, calculated from a 25 cm \(\times\) 15 cm sample weighing 4 g. In contrast, the study conducted by [PERSON] et al. reports an actual weight of 390 g/m\({}^{2}\), obtained from a mass of 2.4375 g over an effective area of 62.5 cm\({}^{2}\), corresponding to the dimensions of the tensile specimen (250 \(\times\) 25 mm\({}^{2}\)). This phenomenon can be interpreted as a significant influence of twill weave on the material's tensile strength, as shown in Figure 7, due to more effective fiber alignment, favoring load transfer.  
\begin{table}
\begin{tabular}{c c c} \hline \hline  & **Tensile Test** & **Impact Test** \\ \hline
**Volumetric Fraction of Jute Fiber (\%)** & **Average Maximum Stress (MPa)** & **Average Energy (kJ/m\({}^{2}\))** \\
12.5 & 44.18 & 14.83 \\
21.4 & 39.76 & 15.17 \\
26.7 & 42.94 & 16.83 \\
28.6 & 41.67 & 15.83 \\ \hline \hline \end{tabular}
\end{table}
Table 6: Results of tensile and impact tests.