This paper presents results following the conclusion of an eighteen month deployment of the VolturnUS 1:8 floating wind turbine installed off Castine, Maine. The prototype is 1:8 scale and serves to de-risk the deployment of a full-scale 6MW turbine farther offshore Maine currently being designed. The VolturnUS design employs a concrete semi-submersible hull with a shallow transit draft. Froude scaling was implemented to design the prototype such that the motions of the prototype in the Castine site represent those of the full-scale unit in an open site farther offshore. An instrumentation package monitors key performance characteristics of the platform to verify design assumptions and coupled modeling software. Over the past year, the unit has experienced metocean environments representative of load cases prescribed by the American Bureau of Shipping. This data provides a unique look at the behavior of a near full-scale floating wind turbine subjected to its operational, extreme, and survival load cases. The prototype was recovered in November, 2014 demonstrating full-scale decommissioning procedures. A full hull, mooring, and steel reinforcement inspection was completed showing that the hull material systems performed as intended.

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