In experiments in a wind tunnel, the oscillations of a circular cylinder equipped with a stabilizer are studied. The cylinder is suspended in the air stream by a cable suspension and can oscillate. The axis of the cylinder in the equilibrium position is directed at a slight negative angle of attack to the direction of the incoming flow velocity. The stabilizer holds the cylinder in this position, providing low drag. The oscillations of the cylinder in the air flow are recorded by the accelerometer, which, together with the controller, is located inside the cylinder. The device makes it possible to measure three projections of the angular velocity of the cylinder on the axis of the coordinate system associated with the cylinder. In a separate experiment, the aerodynamic coefficients of forces and moments acting on the cylinder are determined. The mathematical model previously proposed for describing cylinder oscillations has been modified. The model correctly describes the angular oscillations of the cylinder around an axis close to the vertical, transverse vibrations, the amplitude of which increases with increasing air flow velocity, and the beating mode that occurs in a certain range of air flow velocities. Keywords: wind tunnel, accelerometer, bluff body, mathematical model, ordinary differential equations, similarity numbers.

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