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The Didi Mini Radius Chine Plywood Trans-Atlantic Racer Performance on a small budget Dudley Dix Yacht Design, Inc.

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Presentation on theme: "The Didi Mini Radius Chine Plywood Trans-Atlantic Racer Performance on a small budget Dudley Dix Yacht Design, Inc."— Presentation transcript:

1 The Didi Mini Radius Chine Plywood Trans-Atlantic Racer Performance on a small budget Dudley Dix Yacht Design, Inc

2 Radius Chine Plywood? What is that? Where did it come from? I had a need to build a new boat:- QuicklyQuickly At minimal costAt minimal cost It had to be fastIt had to be fast It had to look goodIt had to look good It had to be capable of crossing oceansIt had to be capable of crossing oceans Dudley Dix Yacht Design, Inc

3 Build it quickly Typical amateur boatbuilder Typical amateur boatbuilder Holding down full-time job Build weekends & evenings Time demands of family & home Quality time with family Home maintenance etc Vacations 2 Years build time available Need efficient building method Need efficient building method Sheet materials for rapid assembly Minimal temporary structure Waste of time & money Build mainly alone Dudley Dix Yacht Design, Inc

4 At minimal cost Typical amateur boatbuilder Typical amateur boatbuilder Limited funds available Build with minimal facilities No costly toolingsNo costly toolings No costly equipmentNo costly equipment Efficient material usageEfficient material usage No spare cash to pay professionals Exotic materials out of the question Dudley Dix Yacht Design, Inc

5 It had to be fast Race across the Atlantic Race across the Atlantic Fun to sail Fun to sail Capable on all points of sail Capable on all points of sail Emphasis on downwind speed Emphasis on downwind speed Quick to surf Quick to surf Plane in strong conditions Plane in strong conditions Easy to control Easy to control Easy speed Easy speed Tiller steered (Lightweight & cheap) Tiller steered (Lightweight & cheap) Dudley Dix Yacht Design, Inc

6 It had to look good Close as possible to round bilge Close as possible to round bilge Not multi-chine Not multi-chine Elegant simplicity Elegant simplicity Good resale value Good resale value Dudley Dix Yacht Design, Inc

7 Capable of crossing oceans 1 st Goal - Race Cape to Rio 1 st Goal - Race Cape to Rio Across the South AtlanticAcross the South Atlantic Some owners will race oceans Some owners will race oceans Others will cruise oceans Others will cruise oceans 2 nd Goal – Race back double-handed 2 nd Goal – Race back double-handed Thereafter, race & cruise Cape of Storms Thereafter, race & cruise Cape of Storms Notorious wind and sea conditionsNotorious wind and sea conditions Winter storms with massive seas Winter storms with massive seas Summer gales Summer gales Dudley Dix Yacht Design, Inc

8 The Result Didi 38 “Black Cat” LOA 11.5m [37’ 9”] LWL 10.33m [33’ 10”] Beam 3.4m [11’ 2”] Draft 2.25m [7’ 4”] Displ IMS 4 tons Displ sailing 4.75 tons Ballast 2 tons Ballast ratio 50% Displ/LWL 120 Dudley Dix Yacht Design, Inc

9 Cape to Rio 1996 The “Peanut Butter Boat” Sponsored by Black Cat Peanut Butter Dudley Dix Yacht Design, Inc

10 Cape to Rio ’96 Summary 3640 miles in 21 days 15 hrs (avg 7 knots) Best 24hr run 250 miles (avg 10.4 knots) Best speed knots Best speed knots Finished in top 20% of fleet On similar LOA, only beaten by Farrier 38 trimaran Dudley Dix Yacht Design, Inc

11 Developed from Didi 38 Chronological design development - each influenced by preceding designs Chronological design development - each influenced by preceding designs Didi 34Didi 34 Didi 26Didi 26 Didi Mount Gay 30Didi Mount Gay 30 Didi MiniDidi Mini Didi 40cr (variation on Didi 38)Didi 40cr (variation on Didi 38) Didi Cruise-MiniDidi Cruise-Mini DH550DH550 Didi 23Didi 23 Didi 28Didi 28 Dix 470Dix 470 Didi Mini Mk3Didi Mini Mk3 Didi Cruise-Mini Mk3Didi Cruise-Mini Mk3 DS15DS15 Dudley Dix Yacht Design, Inc

12 Didi 34 LOA 10.5m [34’ 5”] LWL 9.6m [31’ 6”] Beam 3.4m [11’ 2”] Draft 2.25m [6’ 3”] Displ IMS 3.6 tons Displ sailing 4.3 tons Ballast 1.73 tons Ballast ratio 48% Displ/LWL 135 Dudley Dix Yacht Design, Inc

13 Didi 26 LOA 8.0m [26’ 3”] LWL 7.55m [24’ 9”] Beam 2.47m [8’ 1”] Draft 0.5/1.7m [1’ 8”/5’ 7”] Displ light 1.0 tons Displ sailing 1.5 tons Ballast.44 tons Ballast ratio 44% Displ/LWL 97 Dudley Dix Yacht Design, Inc

14 Didi Mount Gay 30 LOA 9.6m [31’ 6”] LWL 8.4m [27’ 7”] Beam 3.25m [10’ 8”] Draft 1.95m [6’ 5”] Displ IMS 2.3 tons Displ sailing 3.16 tons Ballast 1.15 tons Ballast ratio 50% Displ/LWL 149 Dudley Dix Yacht Design, Inc

15 DH550 LOA 16.75m [55’ 0”] LWL 15.7m [51’ 6”] Beam 8.70m [28’ 7”] Hull beam 2.0m [6’ 7”] Draft 1.0m [3’ 4”] Displ sailing 12.5 tons Dudley Dix Yacht Design, Inc

16 Didi Mini LOA 6.5m [21’ 4”] LWL 6.45m [21’ 2”] Beam 3.0m [9’ 10”] Draft 2.0m [6’ 7”] Displ light 0.85 tons Displ to DWL 1.05 tons Ballast 0.32 tons Ballast ratio 38% Displ/LWL 109 Dudley Dix Yacht Design, Inc

17 Didi Mini Lines Dudley Dix Yacht Design, Inc

18 Didi Mini Details Dudley Dix Yacht Design, Inc

19 Didi Mini Construction Dudley Dix Yacht Design, Inc

20 Didi Mini Sailplan Dudley Dix Yacht Design, Inc

21 Didi Mini Interior Dudley Dix Yacht Design, Inc

22 Didi Mini Water Ballast Dudley Dix Yacht Design, Inc


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