The DH550 is a radius chine plywood catamaran designed by Dudley Dix and Philip Harvey. This video shows the water flow between the hulls, as seen from one of the escape hatches under the bridgedeck.
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This onboard video was taken while racing the Didi 26 "Umoya" on Table Bay in South Africa. The log shows 10.9 knots but was not working. The GPS showed actual speed of 18 knots.
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The Shearwater 45 "Maggy May" sailing in good breeze in the Caribbean. More info at https://dixdesign.com/sh45.htm.