The present deliverable defines a 15 MW reference wind turbine, implemented in the aeroelastic HAWC2 model. The turbine feeds into the further activities in WP1 and the rest of COREWIND, and will form the basis for the floater designs of COBRA and UPC. The turbine is a preview of the IEA 15 MW Reference Wind Turbine, which has been defined by NREL. The turbine has been implemented in DTUs aero-elastic models HAWOpt, HAWCStab2 and HAWC2. This process has been a driver for strong interaction between the NREL and DTU teams and stimulated iterations on the design. The present deliverable provides a preview of the IEA design, which will be released by the end of 2019. It further provides the HAWC2 implementation of the turbine, including a tuned controller and a provisional bend-twist blade design, intended for load reduction around rated wind speed. The key features of the turbine are the 15 MW rated power, a rotor diameter of 240m, direct drive generator and (for the HAWC2 version) a provisional bend-twist coupled design. Links to the IEA and HAWC2 repositories are given in the report.