The International Marblehead is a class of radio controlled sailing yacht used for competitive racing. It is a measurement controlled class administered by the International Radio Sailing Association.

As a designated International IRSA class it is entitled to hold World Championships officially recognised by the International Sailing Federation. A Marblehead has a maximum length of 1290 mm and a maximum draught of ca 700 mm, but no minimum displacement. Up to six rigs are allowed, the tallest being about 2200 mm.

Events

World Championships

Year v t e	Gold	Silver	Bronze	Ref.
1998 Viry-Châtillon  France	Graham Bantock (GBR) Rad (Own Design)	Guillermo BELTRI (ESP)	Janusz Walick (GER)
2000 Los Narejos  Spain	Guillermo BELTRI (ESP)	Graham Bantock (GBR) Rok (Own Design)	Janusz WALICKI (GER)
2002 Ravenna  Italy	Guillermo BELTRI (ESP) Skapel Mk4	Graham Bantock (GBR) Prime Number (Own Design)	Martin ROBERTS (GBR)
2006 Fleetwood  United Kingdom	Martin ROBERTS (GBR) Starkers 2	Ante_Kovacevic (CRO) Prime Number	Zvonko_Jelacic (CRO) Rok
2012 Ploërmel  France	Brad GIBSON (GBR) Grunge (Own Design)	Graham Bantock (GBR) Prime Numbers (Own Design)	Martin ROBERTS (GBR) Starkers 2
2014 Gouda  Netherlands	Brad GIBSON (GBR) Grunge (Own Design)	Graham Bantock (GBR) Quark (Own Design)	Ante Kovacevi (CRO) Quark
2016 Lake Garda  Italy	Brad Gibson (GBR) Grunge (Own Design)	Matteo Longhi (ITA) UNKNOWN	Graham Bantock (GBR) Quark (Own Design)
2018 Biblis  Germany	Brad Gibson (GBR) Grunge (Own Design)	Christophe Boisnault (FRA) Grunge (Brad Gibson)	Peter Stollery (GBR) Up (Roger Stollery)	[1]
2020 West Kirby  United Kingdom	CANCELLED DUE TO COVID 19
2023 Castiglione del Lago  Italy	Patrice Montero (FRA) Grunge (Brad Gibson)	Christophe Boisnault (FRA) Expresso (Own design)	Ante Kovacevic (CRO) Grunge (Brad Gibson)	[2]