Q30
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sailing on foils is more fun Lighter and faster – with the Dynamic Stability System (DSS) The table shows a comparison regarding the planing potential based on the displacement figure DF*, a non-dimensional value that correlates length and displacement (boat + crew). The lower the number, the less wind is required to start planing. For example: Melges 20 is the third-best boat if you look at displacement per meter. However, if we look at the DF column, it ends up in second-to-last place of the selection.. Conclusion: It is too heavy in relation to its length to start planing early. *Third root of D (displacement in m3) / L (length in m) * 1.000 = DF (non-dimensional value) How DSS works: While conventional boats are weighed down and then righted by crew ballast, pivoting keel, or water ballast on the windward side, DSS reverses this principle: The system provides lift for the boat on the lee side, which also rights it. In order to achieve this, a hydro foil similar to the wing of an airplane is extended from the hull on the lee side below water line level. While the boat is in motion, water streams around the profile and thus provides hydrodynamic lift and righting moment. During tacking and jibing, this foil is then pulled onto the new lee side through a type of transverse-mounted centerboard trunk and then provides the necessary lift for the yacht to sail upright on the new course. DSS yachts are always superior to comparable conventional boats: They can make do with less ballast, which reduces their weight in spite of their superior stability. Close-hauled, superiority is less dramatic than at all other points of sail due to the laws of physics. In the best of cases when reaching, a DSS sports boat will be sailing almost twice as quickly as comparable conventional yachts. DSS is a well researched, tested and patented system. It was invented and designed by British yacht designer and hydro foil expert Hugh Welbourn. DSS sports boats by QUANTBOATS are revolutionary: They are very light for their length, and the foil provides stability for the stronger winds in spite of their narrow hull forms. The full power from the sails is used for propulsion. They also benefit from more apparent wind generated by the boat’s speed, similar to multi-hulls. Therefore, QUANT boats start to plane very quickly: Q28 or Q30 can reach speeds of up to 16 to 17 kts with just 10 to 12 kts of wind, depending on the choice of sail and the wave pattern. The explanation is simple: When a Q28 sails at 10 kts or more, the foil develops approx. 500 kg of lift*. It provides not only a tremendous righting moment, but also partially lifts the entire boat out of the water. The sails now propel a boat that, physically speaking, only weighs about 400 kg (= total weight minus lift). The foil allows it to hold its course and reach average speeds previously thought impossible, given the length of 8.5 m. * The foil’s lift increases with the square of the velocity. The narrow hull is optimal for upwind sailing: At wind speeds of 8 kts, the Q28 is close-hauled (TWA 400/AWA 21.20)* with a solid 7 kts; 7.5 kts at TWA 450/AWA 23.00. The weight of the crew is sufficient for upwind sailing. The leeway is minimal, the VMG very high. In stronger winds, the foil is used. The medium lift it provides when tacking (approx. 200 kg) is relevant, but in itself not sufficient to eliminate all stability issues. As is common for sports boats, crew work is needed. Due to the higher percentage of ballast, the Q30 is more stable than the Q28. Reduced boat movements: The foil is also useful when tacking, because it smooths the entire system in addition to providing the righting moment. Hydro- and aerodynamic properties become more efficient, the boat holds a straight course, and the drag inducing rudder movements are minimised. Close-reaching planing: With a slight freeing at wind speeds of 12 kts (TWA 520/ AWA 27.60), for example, the boat speed rises to over 9 kts and the foil instantly provides more lift. The boat lifts completely and enters a planing mode. Whether this can still be described as “tacking”, is a matter of opinion, as opposed to the fun you’ll have. That aspect is incontestable. *TWA = True Wind Angle, AWA = Apparent Wind Angle Planing in Sports Boats Type of boat Length Boat kg Values derived from the Internet, weight in kg, length in m, d/m = displacement/m in kg, displacement figure DF = non-dimensional value that correlates length and displacement (boat + crew) and provides information on planing ability. The ability to plane in a reaching or running breeze is at the very top of the customers’ wish list for modern sports boats. The more quickly a boat can begin to plane and the higher the speeds it can reach, the better. This desire is all too understandable. The fun potential of these boats is high, as is the adventure factor not just in regattas. THE FUTURE OF SAILING BASED ON DSS Max Schmid Alpenquai 13, CH-6005 Lucerne Mobile +41 (0)79 340 44 22 info@quant-boats.com www.quant-boats.com Michael Aeppli General-Wille-Str. 144, CH-8706 Meilen Mobile +41 (0)79 623 77 03 info@quant-boats.com www.quant-boats.com QUANTBOATS: With their new company, Max Schmid and Michael Aeppli aim to develop and build boats with DSS technology for inland waters in order to provide passionate and experienced yachtsmen with access to a new, intense and dynamic style of sailing. These exceptional boats are developed in close collaboration with Hugh Welbourn’s team (dynamicstabilitysystems.com). The full-service boatyard Bucher & Schmid AG headquartered in Lucerne is our cooperation partner and will service the needs of QUANTBOATS customers. Customers and partners know the boatyard as a safe bet in the Swiss bo

Quant30 – For Leaders not Followers The new Q30 is closely related to and a further development of the pre-series DSS boat Q28. The Q30 combines unparalleled performance with easier handling on the water, as well as during boat preparation and transportation. The Q30 is a lake racer and daysailer for demanding yachtsmen and -women who always wanted a sailable, high-performance boat and delight in true innovation. Hull: Thanks to DSS technology, the Q30 - as opposed to conventional sports boats is much less dependent on form stability. It therefore has a very narrow hull, similar to a modern...