Classification society DNV has awarded an AiP to Michelin for their WISAMO wing sail system. This is the first AiP to have been awarded to an inflatable wing sail design and is currently being installed for testing on the DNV classed MN Pélican. The prototype of the sail that will be installed on the Maritime Nantaise ro-ro cargo vessel MN Pelican.First introduced in 2021, the WISAMO sail is an inflatable, retractable, automated wing sail which can be installed on commercial vessels and pleasure boats. The sail is automated with a system developed by Michelin R&D and is retractable for access into ports and under bridges. The AiP has been awarded based on DNV’s WAPS ST-0511 standard.The initial tests of a WISAMO sail were carried out on a sailing yacht. Currently installation of a 100m2 system in being undertaken on the DNV classed MN Pelican. The 155m long, 8,600 dwt Compagnie Maritime Nantaise ro-ro cargo vessel, operates under charter to Brittany Ferries and sails between Poole, Great Britain and Bilbao, Spain. This will allow testing of the system under commercial maritime navigation conditions.