The Arneson @ Twin Disc Surface Drives are among the most efficient marine propulsion systems in the world. Their surface-piercing propeller design reduces underwater drag by 50% compared to conventional submerged propeller drive systems. The only surfaces to contact the water are propeller blades and a protective skeg. This results in higher overall speed, quicker acceleration, and a better payload to power ratio… AND… 50% less drag significantly improves fuel economy while lowering operating costs.

For work, pleasure, gas, diesel, or turbine power systems capable of torque outputs exceeding 30,000 ft. pounds, the Arneson @ Twin Disc Surface Drives come in ten model sizes and various configurations for each model. Available in, Aluminum or bronze castings, straight or drop-center models, 12 or 24 volt compatible systems, plus the new Arneson Dual-Fin surface drives available in the #8 and AI10 models.

Advantages:

• 5% to 30% speed increase over conventional systems.
• 15% to 30% increase in fuel efficiency.
• More efficient than I/O’s
• Corrosion resistant
• Size adaptability, from 100 hp to over 10,000 hp applications.
• Low maintenance requirements.
• Ability to adjust propeller submergence while underway.
• Ability to adjust submergence to match horsepower output permits conversion of more thrust as appropriately needed.
• Propellers ventilate to the surface rather than cavitate under the hull reducing noise and destructive hull and prop erosion.
• Flexibility in engine installation location.
• Less Vibration than Inboard or I/O applications
• Shallow water operation (elimination of underwater appendages).
• Accessible propeller servicing.
• Steerage by the positive thrust of the propeller and not by the propeller thrust to the rudder. This is equivalent to sports car rack-and-pinion steering performance.
• For all it’s sophisticated performance, it is a less mechanically complex and fragile design than other propulsion systems.
• Most models are available in Magnesium Bronze or Aluminum.
• No limitations to shaft angle, blade top clearance, draft to restrict selection of optimum diameter propeller.
• Adaptable to a wide range of engine applications, whether gas, diesel, or turbine.