Technical notes are provided which outline the findings from design studies and 40th scale tank testing of different concepts for the flap and foundation designs of the Oyster 800 and Oyster 801 devices. The different driving parameters for performance, load, CAPEX and overall LCOE are considered, along with the impacts of changing these. 

The selected flap designs continued to evolve and be optimised following the production of these documents.

The main purpose of sharing these reports now is to highlight the different shapes and concepts considered, and to provide information on why many of these concepts were discarded.