His Majesty's Frigate UNICORN, of 46 guns, was built for the Royal Navy in Chatham dockyard, and she was launched in 1824. The classic sailing frigate was a fast and powerful warship, and was one of the most successful and charismatic ship designs of the age. UNICORN's construction, however, is far from conventional. She is a unique survivor from the brief transitional period between the traditional wooden sailing ship and the revolutionary iron steamship.