We present the results of measuring a transverse force arising during the wind tunnel tests of a cylindrical model with conical, ogive and semispherical nose parts of general elongation 6.5. The experiments were carried out at the Reynolds number 105 in the range of angles of attack from 0 to 90°. We analyze the flow spectra on the surface of models obtained by applying a soot-oil mixture to determine the causes for the transverse force. We show that the transverse force arises due to asymmetric development of a pair of vortices near the nose part of a body of revolution.
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