DUDLEY DIX YACHT DESIGN

Didi 120
Radius chine plywood

TIMBER LIST FOR HULL, DECK, BULKHEADS & BUILDING STOCKS

This material list is for the hull/deck/bulkheads structure of the Didi 120 and excludes all interior joinery components aside from the bulkheads. Sizes are finished dimensions, not nominal dimensions. Quantities have been increased to allow for reasonable wastage. This is intended primarily for cost estimation purposes and builders are encouraged to assess their material needs and order as they progress rather than doing a bulk order of all of these items. For a project like this it will be most economical for builders to cut their own timber to size from larger stock.

CHIPBOARD (for setting out bulkheads if building from offsets)
1,83x2,74m 16mm [6'x9'x5/8"] - 2 sheets

MARINE PLYWOOD 1,22x2,44m or 1.22x2.5m [4'x8']
6mm [1/4"] - 22 sheets (extra 22 sheets if building with 18mm skin)
9mm [3/8"] - 5 sheets
12mm [1/2"] - 32 sheets

PINE or similar (for building stocks etc)
38x152mm [1 1/2"x6"] (rails) - 30m [100']
50x75mm [2"x3"] (bulkhead legs) - 33m [110']
100x100mm [4"x4"] or 100mm [4"] dia (posts) - 18m [59']

Meranti, mahogany or similar, selected, free of knots, shakes fractures etc
4x44mm [5/32x1 3/4"] (laminated floors) - 15m [50']
6x125mm [1/4"x5"] (laminated floors) - 175m [575']
10x22mm [3/8"x7/8"] (hull stringer doublers, laminated foredeck beams) - 36m [118']
10x25mm [3/8"x1"] (laminated cabin roof beams) - 50m [164']
10x25mm [3/8"x1"] (laminated cabintop beams) - 50m [164']
19x55mm [3/4"x2.17"] (keelson) - 4m [13']
19x190mm [3/4"x7 1/2"] (keelson) - 4m [13']
22x22mm [7/8"x7/8"] (hull stringer doublers) - 10m [33']
22x35mm [7/8"x1.38"] (deck stringers, tangent stringers) - 85m [279']
22x44mm [7/8"x1 3/4"] (hull stringers, carlins) - 190m [623']
22x60mm [7/8"x2.4"] (cabin roof beam clamps) - 12m [40']
22x70mm [7/8"x2 3/4"] (floors, keelson spacers) - 14m [46']
25x120mm [1"x4 3/4"] (floor doublers) - 3m [10']
30x30mm [1.2"x1.2"] Triangular fillet cut from 32x32mm (structural cleats) - 6m [20']
30x300mm [1.2"x11.8"] (backbone) - 14m [46']
32x32mm [1 1/4"x1 1/4"] (backbone cleats) - 2m [7']
32x44mm [1 1/4"x1 3/4"] (sheer clamp cleats, coaming outer frame) - 12m [40']
32x68mm [1 1/4"x2.7"] (cabin roof stiffener) - 8m [26']
32x100mm [1 1/4"x4"] (sheer clamps, splayed both edges) - 28m [92']
32x125mm [1 1/4"x5"] (spacers under floors) - 4m [13']
50x50mm [2"x2"] (triangular foot braces) - 7m [23']
50x120mm [2"x4 3/4"] (spacers between floors) - 7m [23']
50x150mm [2"x6"] (laminated stem) - 11m [36']
70x75mm [2 3/4"x3"] (sawn floor) - 2m [7']

SUNDRIES
450g/sq.m Stitched glass fabric 45/45 - 20sq.m [215sq.ft]
Epoxy and hardener - 175kg [330lb]

 

STEEL LIST FOR BALLAST KEEL

This list shows the steel materials required to construct the ballast keel. Sizes are the rectangles from which the profiles will be cut so no allowance need be made for wastage except for temporary braces as may be needed during construction.
3mm Plate
500x1700mm [20"x67"] - 1
5mm Plate
1200x2400mm [48"x95"] - 1
1250x1800mm [49"x71"] - 2
6mm Plate
1100x2450mm [44"x97"] - 1
10mm Plate
500x1200mm [20"x48"] - 1
12mm Plate
350x1700mm [9"x67"] - 1

114mm OD pipe with 3.2mm wall [4.5"x1/8"] - 1.7m [67"]
141mm OD pipe with 3.2mm wall [5.56"x1/8"] - 1.7m [67"]
168mm OD pipe with 3.2mm wall [6.63"x1/8"] - 1.7m [67"]
38mm [1 1/2"] dia Bar - 2.3m [91"]
M24 [15/16"] Threaded rod grade 5-6 or 316 S/S 275mm [11"] long - 8
M24 [15/16"] Nuts grade 5-6 or 316 S/S - 8
M24 [15/16"] Half-nuts grade 5-6 or 316 S/S - 8

Lead (nett amount after removing impurities) - 2000kg (4408lb)

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This page was updated 17 March 2026

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