Recent work has drawn attention to the importance of the critical flutter velocity in applying cascade data to axial compressors. The hope has been expressed that it was primarily an aerodynamic phenomenon, though the possibility of mechanical damping being an important factor was not excluded. In this Report the mechanism of stalling flutter has been re-examined to establish, as far as is at present possible, the major para-meters involved.nOn the basis of the hypothesis advanced, the factors governing the critical flutter velocity have been isolated.
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