  We summarize several results based on the velocity data-set for cluster
galaxies provided by ENACS (the ESO Nearby Abell Cluster Survey). We describe
the distribution of velocity dispersions of a complete sample of rich galaxy
clusters, and compare it to the distribution of cluster X-ray temperatures, and
with predictions of theoretical models. We then address the issue of the
existence of a Fundamental Plane (FP) for rich clusters, first suggested by
Schaeffer et al. We confirm the existence of this FP with the ENACS data-set.
The cluster FP is different from the FP of elliptical galaxies, and from the
virial prediction. Some implications of the cluster FP are discussed. Finally,
we describe the phase-space distributions of different populations of cluster
galaxies. Different galaxy classes are defined according to their morphological
or spectral type, and the presence of emission-lines. Star-forming (late-type)
galaxies have a velocity dispersion profile that (in combination with their
wider spatial distribution) is suggestive of first infall into the cluster. On
the contrary, quiescent (early-type) galaxies show evidence of a dynamically
relaxed distribution.

Astrophysics