 He had several sailing yachts built, then in 1829 engaged Scottish engineer and shipbuilder Robert Napier to build the first of what would become eight steam yachts, which were among the first vessels of their kind.Assheton Smith contributed to their design, in particular seeking an efficient hull design to maximise speed.Smith was elected Member of Parliament representing Andover in 1821 and held the seat until 1831; at the 1832 general election he was elected MP for Caernarvonshire and held the seat until 1837.