We have a few Teknicraft ferry's in Auckland, the home town of the designer. One surveyor I work with does many surveys on Teknicraft cats among other designers based down under (Loomes, Lavranos, Hill, Tennant and others) and reports the Teknicraft hulls are the best rough water ride he has every experienced in 20 years survey work. They have a foil midships between the hulls. The hulls are a symmetrical planing shape at the bow and asymmetrical at the stern with a radius chine aft to soften the ride and enable the boat to lean into the turn. Also 2 short horizontal fins in the tunnel at the stern and on the jet models vertical fins also. I wait till we have gale conditions in the harbour and take a ride on the 13m Teknicraft ferry which never seems to miss a run. Heading into 25-30 knot winds with 10 ft short harbour seas (wind against tide) the boat still makes 22 knots SOG and although it gets a little airborne at times the landing does not seem to bother the passengers. No bone jarring tunnel impact that I've experienced on many other cats in head seas at much lower speeds. His tunnel entry design with oversized spray rails and the foil seems to break the wave energy so what's left of it meets the tunnel with much reduced force. Foil assisted cats sure have convinced me for rough water fast rides. Hope to start building one next year. John Winter. www.winteryachts.com