The International Fifteen Metre Class is a construction class, meaning that the boats are not identical but are all designed to meet specific measurements in a formula, in this case the International Rule. In their heyday, Metre classes were the most important group of international yacht racing classes, and they are still actively raced around the world. "Metre" does not refer to the length of the boat, but to her rating; the Length Overall of 15mR boats measuring almost 30 metres (98.4 ft).

History

The IYRU International Rule was set up in 1907 to replace the YRA 1901 revised Linear Rating Rule. The IYRU 15mR boats would replace the YRA 52-raters and open competition to foreign nations, replacing local or national systems with a unified rating system across Europe. The rule changed several times, but the 15mR boats only raced in the first rule of 1907. Only twenty boats were ever built, and were raced in Spain, France, Britain and Germany. The rule was proposed for competition in the 1908 Olympics but there were no entries.

1907 Rule

Used from 1907–1920
where

• = Load Waterline Length
  Waterline length
  The Waterline length is a measurement of ships and boats. The term denotes the length of the vessel at the point where it sits in the water. It excludes the total length of the boat, such as features that are out of the water...
  
   in m
• = beam in m
• = chain girth in m
• = difference between girth and chain in m
• = sail area in m²
• = freeboard in m

Boats

launch	yacht	sail			designer	shipyard	first owner	details
1907	Ma'oona				Alfred Mylne Alfred Mylne Alfred Mylne was a Scottish yacht designer, born in Glasgow. He founded A Mylne & Co. in 1896.- Work :Alfred Mylne was apprenticed to the Scottish shipbuilders Napier, Shanks and Bell, and went on to work as a draftsman and apprentice to George Lennox Watson...	Robert McAlister & Son	J. Talbot Clifton	later sold to Almeric Paget
1907	Shimna				William Fife III	Alexander Robertson & Sons Alexander Robertson and Sons Ltd (Yachtbuilders) Alexander Robertson started repairing boats in a small workshop at Sandbank, Argyll and Bute in 1876, and went on to become one of the foremost wooden boat builders on Scotland's River Clyde. The 'golden years' of Robertson's yard were in the early 1900s when they started building IYRU 12mR & 15mR...	William Yates	later rechristened Slec
1908	Mariska	D1			William Fife III	Fife & Son	A. K. Stothert	refitted 2009.
1909	Ostara				Alfred Mylne Alfred Mylne Alfred Mylne was a Scottish yacht designer, born in Glasgow. He founded A Mylne & Co. in 1896.- Work :Alfred Mylne was apprenticed to the Scottish shipbuilders Napier, Shanks and Bell, and went on to work as a draftsman and apprentice to George Lennox Watson...	Robert McAlister & Son	William P. Burton
1909	Anémone II				C. Maurice Chevreux	Chantier Vincent, Cannes Cannes Cannes is one of the best-known cities of the French Riviera, a busy tourist destination and host of the annual Cannes Film Festival. It is a Commune of France in the Alpes-Maritimes department....	Philippe de Vilmorin
1909	Encarnita				Joseph Guédon	Astilleros Karpard de Pasajes	Marquis of Cuba
1909	Hispania	D5			William Fife III	Astilleros Karpard de Pasajes	King Alfonso XIII of Spain	Refit by the Foundatión Isla Ebusitana in 2010.
1909	Tuiga	D3	D9	1	William Fife III	Fife & Son	17th Duke of Medinaceli Duke of Medinaceli Duke of Medinaceli is a Spanish noble title given to Luis de la Cerda y de la Vega on 31 October 1479, by the Catholic Monarchs, Isabella I of Castile and Ferdinand II of Aragon when the old title of Count of Medinaceli, awarded to his grandfather, Bernal de Foix, in 1368, whereby was transformed...	Owned in the 1920s by Warwick Brookes Warwick Brookes Warwick Brookes was a British businessman, yachtsman and Conservative Party politician. As his retail and other businesses prospered, he was elected to the House of Commons in 1916, but after an electoral defeat in 1918 he returned to commerce and prospered in amusements catering... . refitted 1993.
1909	Vanity				William Fife III	Fife & Son	W. & Benn Payne
1910	Paula II	D8			Alfred Mylne Alfred Mylne Alfred Mylne was a Scottish yacht designer, born in Glasgow. He founded A Mylne & Co. in 1896.- Work :Alfred Mylne was apprenticed to the Scottish shipbuilders Napier, Shanks and Bell, and went on to work as a draftsman and apprentice to George Lennox Watson...	Robert McAlister & Son	Ludwig Sanders
1910	Tritonia				Alfred Mylne Alfred Mylne Alfred Mylne was a Scottish yacht designer, born in Glasgow. He founded A Mylne & Co. in 1896.- Work :Alfred Mylne was apprenticed to the Scottish shipbuilders Napier, Shanks and Bell, and went on to work as a draftsman and apprentice to George Lennox Watson...	Alexander Robertson & Sons Alexander Robertson and Sons Ltd (Yachtbuilders) Alexander Robertson started repairing boats in a small workshop at Sandbank, Argyll and Bute in 1876, and went on to become one of the foremost wooden boat builders on Scotland's River Clyde. The 'golden years' of Robertson's yard were in the early 1900s when they started building IYRU 12mR & 15mR...	Graham C. Lomer	later rechristened Jeano, Gerd II, Rinola, Fortuna II and Cisne Branco
1910	Sophie-Elizabeth				William Fife III	Fife & Son	L. Biermann
1911	Senta				Max Oertz	Max Oertz	Ernst II, Duke of Saxe-Altenburg
1912	Istria Istria (yacht) Istria was a 15-metre class racing yacht designed by Charles Ernest Nicholson and built at the Camper & Nicholsons yard in 1912. She was the first yacht in the world with a lightweight, laminated wood construction and the first to feature a marconi topmast....	D7			Charles Ernest Nicholson Charles Ernest Nicholson -Biography:He was born in 1868.Nicholson's first design of note was the Redwing class. The Bembridge sailing club met in October 1896 to agree the need for a shallow draughted yacht - to allow for the shoal waters of Bembridge Harbour - which could be sailed single-handed, to replace the expensive...	Camper & Nicholsons	Charles C. Allom	World's first Marconi topmast. Topped Class standings in her first season.
1912	The Lady Anne	D10			William Fife III	Fife & Son	George Coast	refitted 1999.
1913	Pamela				Charles Ernest Nicholson Charles Ernest Nicholson -Biography:He was born in 1868.Nicholson's first design of note was the Redwing class. The Bembridge sailing club met in October 1896 to agree the need for a shallow draughted yacht - to allow for the shoal waters of Bembridge Harbour - which could be sailed single-handed, to replace the expensive...	Camper & Nicholsons	S. Glen L. Bradley
1913	Paula III				Charles Ernest Nicholson Charles Ernest Nicholson -Biography:He was born in 1868.Nicholson's first design of note was the Redwing class. The Bembridge sailing club met in October 1896 to agree the need for a shallow draughted yacht - to allow for the shoal waters of Bembridge Harbour - which could be sailed single-handed, to replace the expensive...	Camper & Nicholsons	Ludwig Sanders
1913	Isabel Alexandra				Johan Anker Johan Anker Johan August Anker was a Norwegian sailor and yacht designer who competed in the 1908 Summer Olympics, in the 1912 Summer Olympics, and in the 1928 Summer Olympics....	Anker & Jensen	E. Luttrop
1913	Maudrey				William Fife III	Fife & Son	W. Blatspiel Stamp
1917	Neptune				Johan Anker Johan Anker Johan August Anker was a Norwegian sailor and yacht designer who competed in the 1908 Summer Olympics, in the 1912 Summer Olympics, and in the 1928 Summer Olympics....	Mandrup Abel	S. Klouman