Square Ring Seals,Square Gasket Ring,Square Rubber Ring,Square Cut Oring Ningbo Robon Sealing CO.,LTD , https://www.robonseal.com Recently, Wärtsilä introduced the FPP Opti design, which is a new design concept for fixed pitch propellers. It is reported that the new propeller design can achieve fuel economy up to 4%, and has a high overall performance prediction. Wärtsilä's FPP Opti design was developed by the company's technology and service center in the Netherlands. Not only the computational fluid dynamics calculations are used to analyze the propeller performance, but most importantly the interaction between the propeller and the hull is also analyzed. This provides accurate information for design and parameter optimization.