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Operational Comparison of Gyropilot vs Digipilot- Ship Fuel Saving Technology
Less Rudder Movement = Less Fuel
The tests were performed on the fully loaded ESSO NEDERLAND, a 250,000 dwt VLCC class ship. The ship was travelling at 11 knots in calm seas, with a wind of 16 knots. The settings for the conventional autopilot were selected according to normal practice by the watch officer; no special attempts were made to optimize them. It is observed that the conventional autopilot induces yawing with a period of 90 seconds. The adaptive autopilot, while maintaining a higher frequency of rudder movements, limits the magnitude of the rudder to corrective values. An average speed increase of .0.34% was measured during the operation of the adaptive autopilot, which corresponds to an approximately . 7% decrease in drag.
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