DUDLEY DIX YACHT DESIGN
Dix 38 Pilot
Radius chine steel sloop
Here is a moderate sized steel pilothouse yacht of modern styling and with the performance to go with it.
|She was commissioned as a boat of modern concept with good performance and international appeal. It was to depart as far as practical from the boxy image of most steel boats while maintaining ease of construction. The resulting design has very clean and gimick-free styling, essential for economical construction of a metal design. Within that concept, she includes many modern features to ease life on board.
Hull shape is radiused chine round bilge, with long waterline and clean underbody. The long waterline increases the load carrying ability, reduces the canoebody depth and fines up the entry for wave penetration. The stern is fairly beamy with a flat run to give a clean and flat wake, with resultant ease of control off the wind. The overall result is a reduction in wavemaking both fore and aft and improved speed through the water. A conical stem plate is used to increase flare in the bows, providing more reserve buoyancy and dryness to windward.
|The keel is a NACA foil of 1,75m draft for power to windward. This is combined with a semi-balanced rudder on a partial skeg, to give good directional stability and helm response. A benefit of metal construction is that features like keel draft and rudder configuration can be readily adapted to suit the requirements of anyone who wishes to commission such a variation to the design.
Structural design is to the ABS Guide for Building and Classing Offshore Racing Yachts. Construction is of steel using a stringer system and one-off hulls are built over temporary frames. Bulkheads are structural and are bolted to tabs on the stringers. Production hulls can be built over a spaceframe to achieve rapid and economical construction.
Excess weight is trimmed out by eliminating unneccesary structure. Most metal boats have transverse framing in addition to bulkheads, resulting in excessive structural weight and wasted structure. With the use of structural bulkheads and semi-bulkheads, the transverse framing has been eliminated.
|The available interior layouts are comfortable and spacious, with good privacy for three couples in three sleeping cabins. They are designed around a central engine position, which moves the engine from the conventional under-cockpit position to one of all-round access for maintenance and where it is better placed for weight distribution.
The cockpit is T-shaped for wheel steering, with sleeping length side seats. Aft of the cockpit is a boarding platform to ease boarding from a dinghy or the water.
The rig is double headsail sloop rather than cutter, which would have the mast placed further aft. The double spreader mast is deck stepped with double lower shrouds and running backstays. Standing intermediate backstays or a jumper strut can replace the runners, if preferred. The full-batten main has mid-boom sheeting, led forward along the boom then aft to the cockpit. This keeps the cockpit bridgedeck clear of traveler and controls.
The DIX 38 Pilot is an attractive boat capable of taking her crew to exotic corners of the world with speed and comfort. Also available is a conventional trunk cabin version of this design, the Dix 38. For a larger boat of similar concept, see the Dix 43 Pilot.
Follow these links to print or download:-
Material List for the structure
Article on Metal Radius Chine Construction
List of Drawings
|LOA - 11.70m (38' 5")||LWL 10.25m (33' 7")||Beam 3.80m (12' 6")||Draft 1.5 & 1.75m (4' 11" & 5' 9")|
|Displacement 10000kg (22040lb)||Ballast 2800kg (6171lb)||Area Waterplane 22.66sq.m (244sq.ft)||Immersion Rate 231kg/cm (1293lb/inch)|
|Wetted Surface 36.3sq.m (390.6sq.ft)||Fineness Coef 0.67||Block Coef 0.40||Prismatic Coef 0.55|
|Displacement/Length 259||Sail Area (Main + Fore-triangle) 67.0sq.m (720.9sq.ft)||Sail Area/Wetted Surface 1.85||Sail Area/Displ 14.9|
|Righting Moment @ 30 deg 5399 kgm (39051ftlb)||Righting Moment @ 60 deg 7497 kgm (54226ftlb)||Righting Moment @ 90 deg 5419 kgm (39195ftlb)||Powering30-40hp inboard diesel|
Please note that our plan prices include for adding imperial measurements to our metric designs if needed by the buyer.
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This page was updated 12 March 2018
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