The daggerboards – foils that lift the boat out of the water to break the drag barrier – will be a critical differentiator between the competing teams as they have a significant impact on a boat’s performance.
“Technology plays a huge part in the America’s Cup,” explains Iain Percy, Team Manager and On-Water Tactician for Artemis Racing. “It’s been said the fastest boat has won the America’s Cup for the last 160 years and I’m not sure that is about to change. The daggerboard is the appendage that we fly the boat off and also transfers side force into driving force. Millimetres of difference make knots of difference so the optimal manufacturing and design of the daggerboard is absolutely critical.”
The Altair and Artemis teams have focused much of their effort on optimising the strength, shapes and thicknesses, and how water and wind interact with daggerboards using a simulation-driven design approach. To accomplish this, Artemis used several Altair technologies from the HyperWorks suite including HyperMesh complex composite material finite element model development, OptiStruct for structural analysis and optimisation, and RADIOSS for nonlinear, large deflection analysis.
Two sets of daggerboards were created – one designed to perform optimally in heavier winds and waves and another for lighter wind and wave conditions – and both designed to rapidly lift the boat from the water with minimum drag.
“The tools that we use are at the forefront of the industries,” says Brett Ellis, head of the Artemis team engineering the daggerboards and rudders. “We are working to tight tolerances and small differences in section shapes on the daggerboards can lead to relatively big gains on the water. We are all pushing hard and pushing the design limits to win that America’s Cup.”
Altair has released a short documentary titled ‘Surface To Air’ (http://artemis-racing.americascup.com/en/news/314_SURFACE-TO-AIR.html) highlighting the impact of simulation-driven design on the development of the Artemis boat.
Industries: Marine Transportation and Shipbuilding