Wind-assisted propulsion is a high-potential solution on the path towards decarbonisation. With this in mind, the EU-funded Orcelle project will develop and demonstrate a solution involving wind as the main form of propulsion. Orcelle expects to achieve an energy efficiency gain of more than 50 % (average savings in full-year operation). While engines may be used in situations where there is insufficient wind, energy efficiency gains could reach close to 100 % under ideal sailing conditions. Building on its initial designs of a prototype vessel, the project will now build two physical demonstrators: a 1-wing retrofit (targeting 10 % efficiency gains) and a multi-wing new-build demonstrator (targeting +50 % efficiency gains overall).