Strange as it may seem, it was a requirement for steam powered ships to carry sails, up to the early years of the 20th century. In the picture of the tug Blazer 1888, sails can be seen rolled around the stays. Not much use but complying to the rules. I built a small coaster from scratch & sent to Lloyds for details, although built in 1911 & steam powered, It was listed as a ketch.