Easy and safe steering: a patented non-reversible mechanism eliminates the continuous load on the operator caused by the propeller torque. Compact rotary helm unit: the central location of the steering shaft makes these systems the most compact in their class. Maximum allowable steering wheel diameter: 16" (402 mm) Minimum steering stable bend radius: 7.9" (200 mm) Steering system is not the be used on boats equipped with engines that exceed the maximum horsepower rating of the boat