Spine Fin Efficiency – A Three Sided Pyramidal Fin of Isosceles Triangular Cross-Sectional Area Available to Purchase

An analytical, closed form, solution is presented for determining the fin efficiency of a spine fin with the geometry of a three sided pyramid with isosceles triangular cross-sectional area (from here on referred to as TSPICA). The solution is presented purely in terms of Bessel functions. The TSPICA is modeled using fundamental formulas of geometry. The governing equation is derived from a heat balance around the fin.