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Size  Dual Thrust Propellers    Model  Yamaha's patented Dual Thrust propellers are specially designed for yachts and any other large displacement craft. They are built to handle the job of pushing heavy loads through the water. The hub is carefully designed to redirect the exhaust flow away from the blades so that Dual Thrust propellers cut through “clean water” for higher efficiency and better acceleration. Thrust is improved by up to 70% in reverse and 10% forwards. e.&o.e. ©