The interference between two yachts sailing in several conditions is investigated in the wind tunnel by using two similar yacht models, one of which is mounted on a force balance and the other moved around the test section. The yachts were configured to sail close-hauled upwind at 20° apparent wind angle, downwind under asymmetric spinnaker at 60° and downwind under symmetric spinnaker at 120° apparent wind angle. The regions of positive and negative interference are determined through aerodynamic force measurement and flow disturbance measurement, and the sources of these effects investigated.
Keywords:
spinnaker,
interference,
drive force,
wind angle,
wind speed,
symmetric spinnaker,
yacht,
auckland,
true wind direction,
downwind
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2013. The Society of Naval Architects and Marine Engineers
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