After being involved in the design & build of a composite propeller of a Royal Dutch Navy mine hunter, Airborne Marine acknowledged that the flexible behaviour of composite blades (propellers) could be an advantage with respect to a further signature reduction and fuel efficiency. As a result the Sigprop project was created which validated the concept of a flexible propeller by means of FEM analysis, in which hydrodynamic and structural analysis were coupled. Tank test validation were conducted together with the MARIN institute and DMO which showed “proof of concept” of the idea. The next step was to upgrade the interface between the hydrodynamic and structural analysis. Supported by the MARIN institute with their expertise on hydrodynamic calculations and analysis the upgrading of the interface tool was performed in-house by Airborne through facilitating a master thesis of P. Maljaars, a student of the Delft University. This resulted in a serious step forward as the interface between hydrodynamic and structural analysis was automated. After he successfully obtained his master degree, P. Maljaars endeavoured together with his professor, prof. M. Kaminski, for the next step forward by setting up a Phd study called “GREENPROP”. This study will evaluate the fundamentals even deeper in order to understand and be able to apply the expected benefits of “flexible composite propellers” and eventually build a flexible propeller. Benefits being improvement of fuel efficiency and reduction of the shipping impact on marine life (noise reduction). The Greenprop project was accepted by the Dutch STW in October 2013, with March 1st 2014 being the starting date for the project. The project is supported by Airborne Marine, DMO, MARIN, TU Delft and Wärtsilä. (MKC News 1, Maart 2014). Airborne Marine will support the GREENPROP project with its knowledge of composite (materials) and the manufacturing of a ‘GREENPROP-flexible propeller’ that is to be evaluated and validated. Supporting this project fits the strategy of Airborne Marine to be able to design & build flexible propellers for the maritime market as well as the tidal (blade) market.