DUDLEY DIX YACHT DESIGN
Threefold 6
Multi-chine plywood trimaran
Speedy little trimaran for fun weekends afloat
~ Protected water cruiser |
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The Threefold 6 a trailable minimum cruiser for use on relatively protected waters. I drew her a long time ago to air some ideas which were in my head at the time. They were for an innovative folding system which would have made her a very versatile little boat, with unusual features. Aside from the versatility, the folding system also adds on a big cost factor so it did not take off. Anyway, I show her here for the interest of anybody who may like her concept. |
The folding system uses circular aluminium main beams mounted in bearings to give the choice of horizontal, vertical or inverted horizontal hinge axis orientation. This allows the amas to be swung up on top of the cabintop for trailing, in against the main hull for docking or down below the main hull to assist in righting in the event of a capsize. To date the principles of it have not been tested. |
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She has an easily handled fractional sloop rig with fully battened mainsail and rotating mast. Standing rigging is arranged to allow the mast to stand without the amas in place although the shrouds to the amas must be in place for sailing. Shrouds are angled aft to eliminate backstays. While she has a lot of stability, provision is made in her sail plan for reducing sail considerably for use in a blow. Follow these links to print a material list or a drawing list for this design. |
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Oleg Zelinskiy built his Threefold 6 in Russia. In November 2008 he went out in extreme storm conditions to test his boat. With winds of 15-22m/s (30-40 knots) and gusting to 32m/s (65 knots), they sailed with storm jib and deeply reefed main. He reports that she handled perfectly, even with seas washing over the deck through to the cockpit. She achieved speeds of 15-17 knots and was responsive and under full control at all times. He says that stability was perfect and there was no hint of the boat ploughing in. Oleg is very satisfied with his testing of the boat in storm conditions. |
CHARACTERISTICS
LOA 6.0m [19'8"] |
LWL 5.6m [18'4"] |
Beam sailing 5.0m [16'3"] |
Beam docking 3.3m [10'10"] |
Beam trailing 2.44m [8'0"] |
Draft 0.2/0.6m [0'8"/2'0"]
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Weight 450kg [990lb] |
Mainsail 14.1sq.m [152sq.ft] |
Genoa 10.5sq.m [113sq.ft] |
Bruce Number 1.47 |
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 29 July 2018
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