The name Twentyone is derived from their waterline length of 21 feet.  The overall length is 32.5 feet (9.9m), beam is 7.5 feet (2.25m), sail area is 600 sq ft (55.7m2), and displacement is 3.6 tons, 2 tons of which is the lead keel.  Traditionally they are not equipped with engines or winches and sail with a crew of 4 or 5.  We have provided small electric engines which can be deployed if necessary but mainly they are sailed without engines, even sailing off and back to their moorings. 

We welcome experienced and novice mariners from near and far to share the unique experience of sailing truly authentic classic one-design yachts. The collective ownership of the boats by the Class Association allow today's sailors to share in a uniquely authentic experience 120 years after the fleet's first appearance, by joining a sister organisation "Sailors of Dublin Bay Twentyones".  This is an association of enthusiasts which supports the revival and future security of the Twentyones by maintaining the fleet and mustering crews to sail the boats in races and events held in the vicinity of Dublin Bay during the sailing season, April to October.  Membership of the "Sailors" contribute towards the annual running costs maintaining the fleet for future generations of Twentyoner's! 

The fleet has been widely acknowledged as the oldest class of racing - cruising yachts in the world.