Paper claim: The fin uses a [0/45/90/-45]s quasi-isotropic CFRP layup to match or exceed aluminum stiffness at lower mass.
Recomputed result: Equivalent Ex: 56.68 GPa Equivalent Ey: 56.68 GPa Equivalent Gxy: 22.04 GPa
The quasi-isotropic CFRP layup achieves 56.68 GPa, which is below 6061-T6 aluminum (69.0 GPa). The paper claim of matching or exceeding aluminum stiffness is not met by stiffness alone; the design relies on increased section thickness to compensate.
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