Crain Technologies’ Suction Wing Receives AIP from Bureau Veritas

Source: www.gulfoilandgas.com 8/3/2022, Location: Europe

Bureau Veritas (BV), a world leader in testing, inspection and certification, has delivered an Approval in Principle (AiP) to CRAIN Technologies (Centre de Recherche pour l’Architecture et l’Industrie Nautiques) for their Suction Wing SW270, an auxiliary wind propulsion device for cargo ships.

Jointly developed by Crain and its partner REEL (Rationnel Economique Esthétique Léger), the SW270 is a solid thick wing, fitted with a rear flap. Grids located on both sides of the wing section create a suction force that draws the air stream around the wing section from the outside to the inside of the wing. The wing is mounted on a structural foundation which contains the suction fan required to operate the system.

Based on the principle of boundary layer suction, the Suction Wing concept delivers a very high lift coefficient, which reduces the size of the device needed to achieve a given pull force. Thanks to the shape of the system, the drag remains moderate. Therefore, the lift-to-drag ratio provides a good performance in upwind conditions and for ships sailing at relatively high speeds, using the wind to propel the ship in combination with the main engine. Furthermore, the wing section can rotate around a vertical axis to adjust to wind direction and optimize performance.

While the Suction Wing concept can be derived in a range of sizes in order to fit various vessel sizes, the device considered in this AiP was a wing with a span of 27m.

BV worked very closely with Crain Technologies from the earliest stages. The AiP was delivered in accordance with BV’s Rule Note for Wind Propulsion Systems (WPS) – NR 206. It follows a thorough assessment of the conceptual design, risk analysis, wind tunnel report, preliminary stability, loadings and the general arrangement. This AiP assures that this new technology can be safely used and is ready for the next phase of its development and installation on-board.


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