soaring science fiction novel title request

Years ago I held a copy of a sci-fi novel involving a post nuclear war scenario. The protagonist flies to freedom from a fascist regime using a motor glider. The setting is North America after the Soviet Union strikes with nuclear warheads, leaving the USA in shambles. A Marxist type regime takes over with a police state loss of all personal freedoms.

Does anyone recall such a novel and possibly the title? I've looked through soaring bibliographies and cannot find it. I would like to reacquire the book (book went out on loan to never return, sigh). It was a very good read. I would like to restore it to my soaring library collection. Any help would be most appreciated.
Thanks,
John Iacobucci