We present the results of measuring the 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 10~5 in the range of angles of attack from 0 to 90 deg. We analyze the flow spectra on the surface of models obtained by applying a soot-oil mixture to determine the cause inducing 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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