  We compute the presentations of fundamental groups of the complements of a
class of rational cuspidal projective plane curves classified by Flenner,
Zaidenberg, Fenske and Saito. We use the Zariski-Van Kampen algorithm and
exploit the Cremona transformations used in the construction of these curves.
We simplify and study these group presentations so obtained and determine if
they are abelian, finite or big, i.e. if they contain free non-abelian
subgroups. We also study the quotients of these groups to some extend.
