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Hardware representative of viscoelastic damping material in a cavity in a spinning jet engine blade was investigated. Specimens representing jet engine fan blades were analyzed, designed, fabricated and spun to establish that elastomer filled cavities may be satisfactorily designed for in service high-g and thermal loading and satisfactorily analyzed using conventional finite element analysis. A spin rate of 7500 RPM at a radius of 16 inches was achieved which resulted in a g-level of 25,500. Some excitation and response vibration data during spin were acquired. Static strain readings were taken for the cavIty walls.