Copyright 2017 - Woods Designs, Foss Quay, Millbrook, Torpoint, Cornwall, PL10 1EN, UK
  • home built Flica 37

  • plywood Romany 34

  • lightweight 14ft Zeta mainhull

  • Strike 15 trimaran at speed

  • 28ft Skoota in British Columbia

  • 10ft 2 sheet ply Duo dinghy

  • 24ft Strider sailing fast

  • 36ft Mirage open deck catamaran

Fiberglass

Hullskins
Gelcoat   30kg
225g (3/4oz) CSM  15kg
650/150 Duomat  170kg or 600/300
450g (11/2oz) CSM  30kg
25mm (1") polyurethane foam   7m2
Polyester resin   355kg

Glass joints
650/150g Duomat or
600/300 Biaxial  40kg
450g CSM   30kg
Polyester resin   100kg

Plywood
Interior. . . . . . . . . .6mm 5 sheets + 9mm    3 sheets
Bulkheads. . . . . . . .9mm 5 sheets
Decks,wing. . . . . . . 9mm 4 sheets    6mm 12 sheets
Keel. . . . . . . . . . . .9mm 1 sheet
Beams+Boxes. . . . . 9mm 7 sheets    12mm 1/2 sheet
Centreboard +Box. . .9mm 1 1/2 sheets    12mm 1/2 sheet
Rudders   . . . . . . . . 12mm 1/2 sheet

Timber
Deck stringers   2"x1" 100 metres
. . . . . . . . . . . .1 1/2" 15m

Interior   1"x1" 40m
. . . . . . .2"x1" 35m
. . . . . . .2"x1 1/2" 2m

Beam Boxes   2"x1" 15m
. . . . . . . . . . 3"x1" 10m

Beams    2"x1" 4.5m 8off
. . . . . . .2"x1 1/2" 2.4m 4 off
. . . . . . .3"x2" 4.5m 4 off

Centreboard   4"x5/8  25m

Outer gunwale   2"x1" 17m hardwood


Deck sheathing

300g (1oz) CSM  15kg
Polyester resin   30kg
Styrene monomer  1 litre

Glue
Epoxy glue approx 10kg with fillers. Polyurethane glue approx 5kg

Fastenings
1" no 8 brass CS screws 500. 3/4" no 6 brass CS screws 500. 3/4" gripfast nails 1000.

Notes:
All plywood to be best quality gaboon marine plywood.
All  timber to be best quality douglas fir, sitka or similar (unless noted otherwise)
Glue to be epoxy throughout with collodial silica and microfibre additives as required.
Duomat has varoius other names, e.g. Rovimat,Fabmat etc. and is a combination material of a layer of woven roving bonded to a layer of CSM. The stitched types are usually best.

Plywood

6mm ply - decks, interior, wing, frames  17 sheets
6 or 9mm - hullskins. (Depending on quality) 16 sheets
9mm ply - bulkheads, platform, beams.  16 sheets
12mm ply - keelplanks, rudders, centreboard  3 sheets

TIMBER:  (sizes nominal PAR i.e. 2" x 1" = 45 x 20mm actual size)
1 1/2" x  3/4" .  hull and deck stringers   150m
2" x 1"             gunwales and general   300m
2" x 2"             beamboxes    5m
3" x 1"             major strength framing  25m
1" x 1"             interior     50m
4" x 1"             inner stem    6m
2" x 5/8"          shelf     l0m
6" x 5/8"          keel  (or laminate from narrower strips) 60m
4" x 4"             outer stem cedar ( or  laminate) 3m
2" x 1"             outer gunwale hardwood  25m
1" x 1/2"          bulkhead framing (or 4" x 1"sawn in curve) 10m
3" x 2"             beams     16m
2" x 1 1/2"       mast beams    6m
4" x 5/8"     .    centreboard    25m
Note: all plywood to be marine grade, best quality. If using lesser grade ply, then hull skins should be 9mm,decks 7mm, minimum. Use lightweight plywood , e.g. gaboon.

GLUE: Major strength joints and underwater joints to be epoxy glue (60kg approx)
Deck and Interior joints can be polyurethene glue (10kg  approx)
Hulls to be sheathed in 200g glass cloth
50m2 sheathing material required  ( Deck sheathing optional, extra 35m2 material required)Details of working conditions, method, fillet construction etc. are obtainable from glue manufacturers, as different types require different techniques.

Fastenings to be gripfast nails and/or st steel screws.
Use 1" x  no 8 screws in 9mm ply (500 approx)
3/4" x  no 6  screws in 6, 7mm ply (500 approx )
1/2" x   no 6  screws in buttblocks ( 200 approx)
3/4" nails or stainless screws (hullskins) approx 5000.
Fastening should be at approx. 100mm spacings,
Deckfittings should be fitted with stainless steel self tappers/bolts.