My research topic is "Development of small wind turbines". For structural validation, NREL Phase VI rotor was taken as a reference and referred many articles related to this section. I need your kind suggestions for my blade structural modelling. While modelling blade cross section should be hollow at given thickness, which cannot be able to perform in CREO(modelling software). kindly help me regarding this in order to proceed my research work. Please suggest some techniques for modeling of blade with structural members like spar caps and webs at inside the shell portion.