Twin Disc Marine Products Arneson Surface Drives BY IWIN^DISC MODEL 1 Torque ratings shown are nominal and my vary due to vessel characteristics. 2 Includes ASD unit, trim and steering cylinders, trim pump, reservoir, mounting hardware and hoses. 3 Some boats may require transom mounting wedges. Metric conversion factors: HP x 0.746 = kW. kW x 1.341 = HP. Arneson surface drives materials: A: Almag 35/Aluminum alloy in-line unit or drop-center; B: Bronze in-line unit or drop-center. Contact your local Twin Disc representative for engineering specifications. Specifications subject to change without prior notice in the interest of continual product improvement.