  An experimental study of the vortex-induced-vibration of a flexibly mounted
rigid square cylinder in a uniform airflow is presented. For this high mass
ratio configuration, transverse oscillations are measured in detail for reduced
velocities ranging from 5 to 20. In the lock-in region and starting from rest,
the cylinder motion exhibits a transient regime followed by a limit cycle
oscillation regime. New experimental data are provided in term of amplitudes
and frequencies of the limit cycle oscillations. The transient behaviour is
also characterized by measuring the growth rate of the oscillations amplitude.
