Black Dog Propellers is a source for propellers for your boat from all major manufacturers. We will analyze your specific needs and recommend the best propeller for the application. We have analyzed, recommended sizing and supplied propellers for thousands of applications, including existing applications, re-powers and new builds. We are experts at analyzing 3 blade applications and converting to the proper 4 blade. And have provided propellers for hundreds of these boats with all favorable results. We have analyzed and recommended sizing for hundreds of 5 and 6 blade applications. Your boat will perform as efficient as possible with respect to speeds and fuel burn.