Racecourse-class minesweeper
 For the class of ships sometimes known as the Racehorse class see 24 class sloopThe Racecourse class minesweepers were 32 ships delivered to the Royal Navy during the First World War. They were built to two related designs as paddlewheel coastal minesweeping sloops under the Emergency War Programme. The vessels were reasonable sea-boats but lost speed badly in a seaway when the paddle boxes tended to become choked with water.