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James Wharram Designs

Unique self-build sailing catamarans, inspired by the double canoes of the Polynesians

Building Plans

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Islander 39 3D drawing

A Course In Boat Building

Complete, clear and detailed plans to build your own Wharram Catamaran, that have often been described as a ‘course in boat building’. All Wharram building plans are drawn for the first time builder, so anyone with a modicum of practical ability can build one of our designs. Wharram designs are all based on decades of actual building and sailing experience of the boats, so you can be confident in its sailing capabilities and safety.

Our Featured Item

Limited Edition Rongo Box Set

Limited Edition Rongo Box Set

Limited edition Rongo memorabilia box set – includes building plans. Rongo was the first catamaran to have made the difficult voyage across the North Atlantic in 1959.

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