3.1. Three-legged semi-submersible floating foundation
(1) ‘Drijfwind’ project
In 2002, a project called ‘Drijfwind’ [36] was sponsored by ECN, MARIN, DUT, TNO, MSC (now part of GustoMSC). With the purpose of improving vertical motion response and reducing the overall construction volume, a three-legged floating foundation, named as
Dutch Tri-floater, was proposed for the first time.