Cork Sea Trials

When comparing the testing data to the simulations and CFD modelling the results were very similar.

• The Artemis EF-12 Workboat achieved within 4% of what the simulations predicted in terms of roll and stability during interaction with the ships.
• Positive heel control achieved during the approach.
• Yaw angles in excess of 20 degrees while alongside were easily achieved by controlling the rudder, without the need for additional vector thrust or throttle manipulation.

The Artemis EF-12 Workboat was able to foil through the pressure wave and close to the contact point at the ship. Dropping down into displacement mode there is no following wake created, ensuring safe and stable close quarter manoeuvres, enabling efficient operation.

A major benefit during approach and contact with the ship is the stability afforded by the flight control system. This is achieved by the foils utilizing their control surfaces to provide active stabilization, providing a more stable platform for the Pilot and crew to safely complete their operation.

The flight control system continually worked to provide a stable platform and maintained a desired heel angle while alongside at speeds ranging from 6—14 knots.

Through simulations, we had shown that the forward foil would act similar to a keel on a sailing yacht by providing a lift force when a yaw angle was applied alongside the ship. The simulator showed that the foil would provide a beneficial force when holding station alongside the ship but would provide a breakaway force once the pilot boat reduced and started to breakaway.

The simulator results again were proven to be incredibly accurate in the Cork trials when the Artemis EF-12 Workboat would break away easily. This was aided by the offset in the fender on the shoulder and the aft quarter providing the initial break away angle resulting in minimum rudder assistance needed.