Copyright 2019 - 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

Materials list
The metric measurements are the final timber sizes. But many builders use thicker pieces of wood as they are easier to obtain, and they don't then bother to plane them thinner. There is no problem doing that if you want to save time.

Deck jig
1 sheet 8ft x 4ft.(2440 x 1220mm) 12mm thick chipboard
Approx 6m 2" x2" (45 x 45mm) and 10m of 3" x 1" (70 x 20mm) rough sawn timber.
Copper wire 10m minimum (we use old household wiring)


217 width at deck, 95 width at 150 above keel, 47 deck camber
Bhd 3
40 Deck camber
88 width at deck, deck camber 8, 150mm above keel width is 55, gunwale is 150+127=277 above keel

Deck Jig

Reading from the left of the drawing the measurements are: 5, 140(horizontal dimension), 30, 100, 150, 183, 195, ALL 500 (horizontal dimension), 195, 180, 145, 90, 140 (horizontal dimension), 70 The cutout in the jig doesn't have to be too accurate as the ply will form a fair shape.


The rudder drawing reads: Steering is more positive if "Ackerman Linkage" is used (as on the front wheels of cars). This can be done by making cranking tillers (angle in 10deg) as shown dotted below


The 3225 means 3.2in x 2.5in (80mm x 60mm) as a minimum. Most beach cats use similar spars so there is no problem using second hand spars from other boats. You just have to accept a few odd holes here and there, but I have never found that to be a problem.

The mast can be longer if you want more head clearance under the boom.