The time evolution of giant (D>1 Mpc) lobe-dominated galaxies is analysed on
the basis of dynamical evolution of the entire FRII-type population.Comment: 4 pages, 2 Postscript figures, uses baltlat1.sty To be published in
"Radio astronomy at 70: from Karl Jansky to microjansky", JENAM-2003
Symposium, eds. L.Gurvits and S.Frey, (Baltic Astronomy