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Fin Flutter Speed Calculator
Calculate the maximum safe airspeed before destructive fin flutter based on fin geometry, material and altitude.
Flutter velocity
---m/s
Flutter Mach
---
Safety factor vs max speed
---×
Uses the NACA thin-panel flutter boundary. Real flutter onset depends on construction quality, adhesive joints, fin alignment, and surface finish. Add a safety factor of at least 1.5×. Thicker fins, shorter span, and stiffer materials all increase flutter resistance.
Vflutter = a × √( G × (t/c)3 / (1.337 × AR3 × P × (λ+1)/2) )
Ref: NACA TN-4197