DNV GL Awards AIP to KSOE for Wing Sail Propulsion Maritime Activity Reports, Inc. Rendering of the VLCC with the wings sails in place (Image: KSOE) Classification society DNV GL said it has granted Approval in Principle (AIP) to Korea Shipbuilding and Offshore Engineering (KSOE) for a new wing-sail auxiliary propulsion system for ships designed to help reduce shipping emissions and fuel burn. The wind-powered auxiliary propulsion system, designed for installation aboard many vessel types, is the result of a joint research project from KSOE, the shipbuilding holding company of Hyundai Heavy Industries Group, and SK Shipping, to develop wind-powered eco-friendly propulsion solutions.