The Merlin Rocket is a 14 foot dinghy sailed in the United Kingdom. It is an active class, now with over 3700 boats built. The boat designed around a box rule, meaning that all class boats need to be a certain length and width, but can be any shape. This allows for quick modernization of the class. The great advantage to this is quick adoption to new technology and the ability to change a boat to a person's weight and ability. Although the rules allow for many sail plans, many modern Rockets have similar sails. Most have a high batten allowing for a large roach in the sail. Although the rules are open, they are not unlimited. Use of a Trapeze is forbidden in this class.