single-screw ship

Later he recalled that the most difficult and intense period of his seagoing career occurred when he had to manoeuvre his single-screw ship round an unexploded mine.

The harsh operating conditions of the arctic seas placed high requirements on the strength, reliability and redundancy of the propulsion machinery, especially for single-screw ships operating independently without icebreaker escort.

An important vessel in the history of the Isle of Man Steam Packet Company, Mona was not only the first single-screw ship of the line, but she was fitted with vertical compound steam engines.