... pacific grace side force precedent criteria resistance transverse section keel hull keel profile stability coefficient heel angle requirement wolfson unit rig gz curve university boat sail plan THE 21st CHESAPEAKE SAILING YACHT SYMPOSIUM ANNAPOLIS, MARYLAND, MARCH 2013 The Evolution...

... be made. hull windage main hull deck coefficient eff effective wind angle rig tunnel run full-scale measurement full-scale data tunnel measurement drag coefficient lift coefficient force coefficient deck plane perpendicular wind tunnel mainsail wind tunnel measurement THE 18th...

... Aerodynamic performance of a Japanese traditional square rig, “Bezai-ho”, and a Chinese lug rig, “Shinshi-bo” in Japanese, were studied by means of wind tunnel tests, sea trials and numerical calculations. Sail forces and sail shapes were measured in the wind tunnel tests. A sail dynamometer...

... were initiated in response to perceived inequities in the ratings of boats of various rig designs sailing under the International Measurement System (IMS). Observations of on-the-water performance have lead to the conclusion that there are biases within the rule with respect to rig planform design...

... Standard approaches to define loads for a rig start with the righting moment of a yacht at 30 degrees of heel. This is a quite good approach for defining maximum lateral forces of the sails on upwind courses. For downwind courses this procedure may be questioned because the forces from the sails...

... This paper introduces an alternative rig which would suit sailing vessels carrying square rig on one mast and having a weatherly hullform. A weatherly hullforms necessary since the advantage of this rig is that it shows a surprising and unusual windward capability. scale model square...

... to assist in the design stages of any sailing vessel. marine transportation model test ship sailing performance resistance programme prediction roll period stability requirement wolfson unit rig windage computer prediction arrangement inertia natural roll period directional stability...

... which would allow simple, inexpensive testing of sails to be conducted. This effort culminated in the design and construction of an outdoor sailing dynamometer which can measure all of the forces and moments produced by a sail. The apparatus is capable of testing full-size dinghy rigs or scaled-down...

... A number of wind tunnel tests have been conducted by the Wolfson Unit in aid of the development of sailing rigs for both cruising and racing boats, including recent tests for the United States Sailing Association as part of the joint IMS/PHRF research programme. In the process of these tests...

... in the most constructive way. Access to the wind tunnels, test tanks and structural testing facilities at the Royal Institute of Technology in Stockholm enabled them to develop and test many ideas. One of these ideas evolved into the B&R rig. The objective was to develop a rig that was more 'user...

... and induced drag. Much of the work has concentrated on optimisation of the distribution of aerodynamic lift over the sailplan without specifying how the lift distribution may be achieved in practice if indeed the lift distribution can be obtained within the practical constraints of conventional rig technology...

... This paper examines planform and aspect ratio effects on potential power of a number of rigs - Bermudan, Lateen, Sprit, Gunter, Dipping Lug and Crab Claw rigs, some with modifications (Figure 1). Coefficients of effective driving force, based on wind tunnel testing, are established for those...

... Inviscid lifting surface techniques are applied to strongly interacting multiple sail configurations. A computer program is developed to solve the resulting non-linear potential flow problem. It is employed to predict the pressure distributions for a number of single and multi-sail rigs...

... The purpose of this paper is to present a very general overview as to how basic concepts of aerodynamics and hydrodynamics can be utilized in the selection and trim of sails. I have used the term selection to go all the way back to the routes of designing and selecting a rig for a given boat...

... Booms are dangerous and can now be done away with. The mainsail is trimmed by three sheers to three permanent backstays, (see Fig.1.). A mainsail that is luff roller furling on a rotating jackstay that is aft and parallel to the mast can be furled or reefed in seconds, (see Fig.2). The best rig...