1. The Didi MiniRadius 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:- • Quickly • At minimal cost • It had to be fast • It had to look good • It had to be capable of crossing oceans Dudley Dix Yacht Design, Inc

3. Build it quickly • 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 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 Limited funds available Build with minimal facilities • No costly toolings • No costly equipment • Efficient 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 • Fun to sail • Capable on all points of sail • Emphasis on downwind speed • Quick to surf • Plane in strong conditions • Easy to control • Easy speed • Tiller steered (Lightweight & cheap) Dudley Dix Yacht Design, Inc

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

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

8. The ResultDidi 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 1996 18 knots Best speed 2000 23 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 • Didi 34 • Didi 26 • Didi Mount Gay 30 • Didi Mini • Didi 40cr (variation on Didi 38) • Didi Cruise-Mini • DH550 • Didi 23 • Didi 28 • Dix 470 • Didi Mini Mk3 • Didi Cruise-Mini Mk3 • DS15 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