DUDLEY DIX YACHT DESIGN

Didi 38
Radius chine plywood

The following lists of materials are approximate and intended for calculation of approximate costs. We offer no guarantees of accuracy. They show the quanities that Dudley used when building "Black Cat" and are not applicable to building from a kit, which will use more plywood.

For the Didi 40 and Didi 40cr, increase wood quantities by 5%.

TIMBER LIST FOR HULL, BULKHEADS & BUILDING STOCKS

This list is for construction up to hull turnover stage and covers building stocks, bulkheads, hull framing and hull skin. Various options are open to the builder to construct much of the interior joinery, cockpit well etc before fitting the hull skin but such items are excluded from this list . Cleats to receive joinery attached to bulkheads are included. Allowance has been made for reasonable wastage and scarphing.

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

MARINE PLYWOOD 1,22x2,44m [4'x8']
4mm [3/16"] - 5 sheets
6mm [1/4"] - 12 sheets (extra 20 sheets if building with 18mm skin)
9mm [3/8"] - 9 sheets
12mm [1/2"] - 21 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
6x75mm [1/4"x3"] (laminated floors) - 144m [473']
10x25mm [3/8"x1"] (laminated cabintop beams) - 20m [66']
15x150mm [5/8"x6"] (keelson) - 3m [10']
20x20mm [3/4"x3/4"] Triangular fillet (joinery cleats) - 70m [230']
22x32mm [7/8"x1 1/4"] (tangent stringers) - 45m [148']
22x44mm [7/8"x1 3/4"] (stringers, stem capping) - 100m [328']
22x60mm [7/8"x2 3/8"] (stem capping) - 1,5m [5']
22x80mm [7/8"x3 5/32"] (floors, keelson spacers) - 5m [17']
30x30mm [1 3/16"x1 3/16"] Triangular fillet (structural cleats) - 15m [50']
30x250mm [1 3/16"x9 13/16"] (backbone) - 12m [40']
32x32mm [1 1/4"x1 1/4"] (cleats for backbone) - 2m [7']
32x44mm [1 1/4"x2"] (cleats for sheer clamps) - 6m [20']
32x70mm [1 1/4"x2 3/4"] (floors) - 3m [10']
32x100mm [1 1/4"x4"] (sheer clamps, splayed both edges) - 25m [82']
38x38mm [1 1/2"x1 1/2"] (mast posts) - 4m [13']
38x75mm [1 1/2"x3"] (mast posts) - 2m [7']
50x70mm [2"x2 3/4"] (floors) - 1m [4']
100x100mm [4"x4"] (stem, splayed both sides) - 1,5m [5']

 

TIMBER LIST FOR DECK

This timber list is for construction from hull turnover stage to completion of the decks and includes the remaining bulkheads, deck framing and deck skin. Allowance has been made for reasonable wastage and scarphing.

MARINE PLYWOOD 1,22x2,44m [4'x8']
6mm [1/4"] - 10 sheets
12mm [1/2"] - 12 sheets

Meranti, mahogany or similar, selected, free of knots, shakes fractures etc
10x25mm [3/8"x1"] (laminated cabintop beams) - 30m [100']
10x32mm [3/8"x1 1/4"] (laminated clamp) - 10m [33']
12x44mm [1/2"x1 3/4"] (Trim - optionally decorative hardwood) - 20m [66']
20x20mm [3/4"x3/4"] Triangular fillet (structural cleats) - 9m [30']
22x22mm [7/8"x7/8"] (framing to coamings and swim platform) - 25m [82']
22x35mm [7/8"x1 3/8"] (stringers) - 35m [115']
22x44mm [7/8"x1 3/4"] (stringer, carlins & hatch framing) - 20m [66']
22x60mm [7/8"x2 3/8"] (cabin beam clamp) - 15m [50']
22x69mm [7/8"x2 3/4"] Triangular fillet (carlins) - 14m [46']
25x25mm [1"x1"] (Toerails - optionally Teak) - 20m [66']
30x30mm [1 3/16"x1 3/16"] Triangular fillet (structural cleats) - 18m [59']
32x44mm [1 1/4"x1 3/4"] (framing to coamings) - 8m [27']

 

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 [1/8"] Plate
500x1600mm [20"x63"] - 1
500x2250mm [20"x89"] - 2
4mm [3/16"] Plate
1225x1550mm [49"x61"] - 2
6mm [1/4"] Plate
330x2050mm [13"x81"] - 1
340x400mm [14"x16"] - 2
10mm [3/8"] Plate
125x1000mm [5"x40"] - 1
225x1450mm [9"x57"] - 1
400x2000mm [16"x79"] - 1

3" Sched 40 pipe - 1.6m [5'3"]
4" Sched 40 pipe - 1.6m [5'3"]
10mm [3/8"] dia Bar - 0.4m [1'4"]
30mm [1 3/16"] dia Bar - 1.6m [5'3"]
M20 [3/4"] Hexhead bolts grade 5-6 or 316 S/S 200mm [8"] long - 8
M20 [3/4"] Nuts grade 5-6 or 316 S/S - 8

Lead (nett amount after removing impurities) - 1725kg (3800lb)

If keel and bolts are to be bonded to the hull in epoxy then replace the bolts with 316 S/S M20 Readybar (threaded bar) and another 8 nuts.

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This page was updated 25 March 2011

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