Lloyd’s Register has granted approval in principle (AiP) to Rondal for its Aero Wing Sail.
The approval follows completion of concept-level assessment activities in line with Loyd Register’s guidance notes on wind assisted propulsion systems for 2025.
The Aero Wing Sail is a rigid wing-sail concept designed for application on large yachts and multihull platforms designed to provide wind-assisted propulsion capability and ease of integration within vessel layouts.
Lloyd’s Register says the approval in principle confirms that the Aero Wing Sail concept has been reviewed against relevant safety, structural, mechanical, and aerodynamic considerations.
The evaluation included computational fluid dynamics analysis, structural design review and mechanical system evaluation to identify operational and integration-related risks.
Wind-assisted propulsion is a vital step toward reducing emissions.
Tom Wolodarsky
Lloyd’s Register has also provided recommendations for further refinement of the concept.
“This approval in principle reflects Lloyd’s Register’s commitment to enabling innovative technologies that support decarbonisation and operational efficiency,” said Tom Wolodarsky, senior surveyor and lead specialist WASP, Lloyd’s Register.
“Wind-assisted propulsion is a vital step toward reducing emissions, and we are proud to collaborate with Rondal in bringing this solution closer to market readiness.”
Hermen de Jong, innovation manager, Rondal, added: “This approval in principle is an important achievement for Rondal.
New yacht projects
“It demonstrates the maturity of the Aero Wing Sail and that we are ready for application in new yacht projects.”
Lloyd’s Register says the approval forms part of its wider commitment to supporting the safe and scalable adoption of wind-assisted propulsion technologies.
Approval in principle offers technology developers the opportunity to provide a roadmap for full regulatory compliance.
The Aero Wing Sail is suitable for multihulls and wind assisted applications. The sail is manufactured from lightweight composite materials, and is free-standing with the
ability to rotate fully around its vertical axis.
