  Smooth time dependent supergravity solutions corresponding to analytic
continuations of Kerr black holes are constructed and limits with a local de
Sitter phase are found. These solutions are non-singular due to a helical twist
in space and a fine tuning of the energy flow in the spacetime. For the
extremal limit in which the mass and twist parameters are equal the S-brane
undergoes de Sitter expansion. Subextremal limits show the formation and decay
of a twisted circle and closed string tachyon condensation backreaction effects
can be followed. For small values of the twist deformation, a short lived
ergosphere envelopes the S-brane and leads to the production of closed timelike
curves.
