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Basic of Boat Design Kymenlaakso UAS / Boat Technology Terho Halme Aug 2013 Learning Outcomes On successful completion of the unit, students will be able to: • explain properties and use of different boat types • collect and compare technical data of boats • define relative speed and select the boat type • explain boat properties due to dimensions and parameters • define boat dimensions and calculate boat parameters • explain factors interacting stability • evaluate stability of a sail boat using Dellenbaugh method • explain and estimate elements of sail boat performance • estimate boat speed and power requirements • explain structure and content of lines drawing • prepare a proposal concept design Kymenlaakso UAS/Terho Halme 2 Content & Schedule Mon Tue Wed Thu Fri Learning Weight Planing boats Lines drawing outcomes calculation Sailing boat Relative speed performance Displacement boats Proposal Parametric Stability concept design Semi- design displacement Lines drawing boats Kymenlaakso UAS/Terho Halme 3 From the Methods • The Methods presented in Basics of Boat Design are simplified and used only in the concept design phase of the boat. • (Boat Design Methods are defined later in the study modules of Hydrostatics, Hydro- and Aerodynamics, Layout design and Structure engineering.) Kymenlaakso UAS/Terho Halme 4 Collecting boat data • Collect the data of boats from the boating magazines and internet. The tests of boat magazines are good sources, domestic and foreign magazines you will find in the libraries. • Boats must be representative of the entire field of the yachting, that is, of all sizes (2.5 - 24 m), different materials, different uses, boats for cruising, racing, connection, etc. • The information is later used for the boat parametric design exercises. Save the data on an Excel table, sailboats and motorboats on their own sheet. • Get started now ... Kymenlaakso UAS/Terho Halme 5 Sailboat data • Length of hull (LOA, LH), [m] • Length of waterline (LWL), [m] • Beam of hull (BOA,BH), [m] • Draught of hull (Tc), [m] • Draught total (T), [m] • Displacement fully loaded(mLDC), [kg] • Displacement empty (mLCC), [kg] • Ballast weight (mk), [kg] • Sail area (As), [m2] • Sail dimensions (P,E,I,J), [m] • Engine power (P), [kW] • Material of the hull and deck (glass fibre, carbon fibre, cored glass fibre, cored carbon fibre, wood, steel, aluminium, etc.) Kymenlaakso UAS/Terho Halme 6 Motorboat data • Length of hull (LOA, LH), [m] • Length of waterline (LWL), [m] • Beam of hull (BOA,BH), [m] • Draught of hull (Tc), [m] • Deadrise amidships (planing boat) • Displacement fully loaded (mLDC), [kg] • Displacement empty (mLCC), [kg] • Engine power (P), [kW] • Propulsion (outboard, inboard z-drive, inboard shaft, water-jet, surface propeller, etc.) • Material of the hull and deck (glass fibre, carbon fibre, cored glass fibre, cored carbon fibre, wood, steel, aluminium, etc.) Kymenlaakso UAS/Terho Halme 7 Boat Hull Types Right boat type for the purpose. Relative speed • Relative speed is V expressed by Froude Fn number (Fn). g LWL • With the same Froude V boat speed (m/s) number the wave patterns are similar. LWL waterline length (m) • So called “hull speed” is g 9,81 m/s 2 when Fn = 0,40, then the 1852 m wave length and the 1 knot waterline length are equal 3600 s • Hull speed is NOT any speed limit Kymenlaakso UAS/Terho Halme 9 Boat types • Displacement boats, Fn<0,45 – Fishing boats, rowboats, keelboats, trawlers, tugs, ships • Semi-displacement boats (semi-planing), 0,4<Fn<1,0 – Cruising boats, motor yachts, catamarans • Planing boats, Fn>1,0 – Almost all small outboard boats, day cruisers, runabouts, race boats

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