A short story about a flying craft, gaining its lift from by hundreds of vertical (Archimedes?) screws. It may have been set in London.
Obviously this is a very old story, possible H.G. Wells or Jules Verne.
Unfortunately, this is all that I can recall, other than it was read in the mid 1970's but is obviously much older.
I've checked and it's not "Robur the Conqueror".