ROPE RUNNER, IOR 40ft Racing Yacht
Design 82 - This design was conceived as an all-out Admiral's Cup yacht with no concession to any other style of racing or unnecessary creature comforts. The minimum rating of 30.0 feet was decided on not only for minimum capital outlay, ease of handling and a size of boat where optimum performance can be gained very easily in a lightish displacement yacht, but also because over the years minimum rating appears to have offered the best chance of producing the top all-round performance. Sail area is very height on this design to produce excellent light weather performance and to give more power out of start-line situations where larger boats leave very disturbed air for the smaller boats behind. The fractional rig was chosen as this will give much faster accelerations in tight tacking situations, starts, rounding marks etc, and wider wind range without sail changes. The resulting moderate size spinnakers also assist with faster and easier handling of these sails compared with masthead rigs. The hull form is typically Farr with powerful sections, not excessive beam, fine bow to handle a short chop to windward, and as light in displacement as the DLF of the IOR Rule will allow, consistent with all-round performance. Stern sections are more conservative in beam than is usual from our office to gain better light weather and upwind performance relative to rating.
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Designer’s Notes
This design was conceived as an all-out Admiral's Cup yacht with no concession to any other style of racing or unnecessary creature comforts. The minimum rating of 30.0 feet was decided on not only for minimum capital outlay, ease of handling and a size of boat where optimum performance can be gained very easily in a lightish displacement yacht, but also because over the years minimum rating appears to have offered the best chance of producing the top all-round performance. Sail area is very height on this design to produce excellent light weather performance and to give more power out of start-line situations where larger boats leave very disturbed air for the smaller boats behind. The fractional rig was chosen as this will give much faster accelerations in tight tacking situations, starts, rounding marks etc, and wider wind range without sail changes. The resulting moderate size spinnakers also assist with faster and easier handling of these sails compared with masthead rigs. The hull form is typically Farr with powerful sections, not excessive beam, fine bow to handle a short chop to windward, and as light in displacement as the DLF of the IOR Rule will allow, consistent with all-round performance. Stern sections are more conservative in beam than is usual from our office to gain better light weather and upwind performance relative to rating. Construction utilizes substantially Kevlar, with some S Glass, and is the result of exhaustive analysis of pure efficiencies of various materials as well as comparisons on a cost versus effect basis. The resulting structure varies in detail between the extreme ends and the centre of the boat to gain best advantage within limited expenditure. The so called "space frame" system is not used as our research and practical examples show that a properly engineered structure can be stiffer, lighter and stronger than a space frame arrangement. The deck and internal arrangement were drawn up around the skipper's (Don Lidgard) specific requirements to facilitate his particular style of sailing.