  In this study, a partially submerged vertical cylinder is moved at constant
velocity through water, which is initially at rest. During the motion, the wake
behind the cylinder induces free-surface deformation. Eleven cylinders, with
diameters from $D=1.4$ to 16 cm, were tested at two different conditions: (i)
constant immersed height $h$ and (ii) constant $h/D$. The range of translation
velocities and diameters are in the regime of turbulent wake with experiments
carried out for $4500<Re<240 \,000$ and $0.2<Fr<2.4$, where $Re$ and $Fr$ are
the Reynolds and Froude numbers based on $D$. The focus here is on drag force
measurements and relatively strong free-surface deformation up to
air-entrainment. Specifically, two modes of air-entraiment have been uncovered:
(i) in the cavity along the cylinder wall and (ii) in the wake of the cylinder.
A scaling for the critical velocity for air-entrainment in the cavity has been
observed in agreement with a simple model. Furthermore, for $Fr>1.2$, the drag
force varies linearly with $Fr$.
