International Marblehead
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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
| Gold | Silver | Bronze | |
|---|---|---|---|
 1998, Viry-Châtillon |
 Graham BANTOCK (GBR) Rad (Own Design) |
 Guillermo BELTRI (ESP) |
 Janusz WALICKI (GER) |
 2000, Los Narejos |
Guillermo BELTRI (ESP) |
Graham BANTOCK (GBR) Rok (Own Design) |
Janusz WALICKI (GER) |
 2002, Ravenna |
Guillermo BELTRI (ESP) Skapel Mk4 |
Graham BANTOCK (GBR) Prime Number (Own Design) |
Martin ROBERTS (GBR)
|
.svg) 2006, Fleetwood |
Martin ROBERTS (GBR) Starkers 2 |
 Ante KOVACEVIC (CRO) Prime Number |
Zvonko JEALACIC (CRO) Rok |
2012, Ploërmel |
Brad GIBSON (GBR) Grunge (Own Design) |
Graham BANTOCK (GBR) Prime Numbers (Own Design) |
Martin ROBERTS (GBR) Starkers 2 |
 2014, Gouda |
Brad GIBSON (GBR) Grunge (Own Design) |
Graham BANTOCK (GBR) Quark (Own Design) |
Ante KOVACEVIC (CRO) Quark |
2016, Lake Garda |
Brad GIBSON (GBR) Grunge (Own Design) |
 Matteo Longhi (ITA) UNKNOWN |
Graham BANTOCK (GBR) Quark (Own Design) |
 2018, Biblis[1] |
Brad GIBSON (GBR) Grunge (Own Design) |
 Christophe Boisnault (FRA) Grunge (Brad Gibson) |
Peter STOLLERY (GBR) Up (Roger Stollery) |