I have an idea to build a twin-engine hydro around 10 feet long. The power would be 2 hopped-up air-cooled Lawnmower engines. The problem I need to solve before embarking on this wild ride is, where can I get the props? I'm looking for 8 inch diameter props but one has to be right and the other left-hand rotation. If I run 2 spinning the same direction, I may get torque steer or prop walk. I have already built an 8 ft mono hull powered with an 8 HP snowblower engine with "Thai" drive.