Porcupine-class post ship
 The Porcupine-class sailing sixth rates were a series of ten 24-gun post ships built to a 1776 design by John Williams that served in the Royal Navy during the American Revolutionary War. Some survived to serve again in the French Revolutionary and the Napoleonic Wars. The first two were launched in 1777. Three were launched in 1778 three more in 1779 and the last two in 1781.