First Choose a Design
The newest trimaran design is the Strike 20. It is akin to a scaled up Strike 15, rather than a longer Strike 18.
A quote from a builder after his fourth sail "yesterday we achieved 9 /10 kt to windward, 16 kt broad reaching under gennaker (14.8knots over 500 m and 14.3 over a nautical mile)."
"I have now built a Richard Woods Strike 20 with Nacra 5.8 outriggers, which is much faster than my former Dick Newick Tremolino"
You can see a video here
Main hull, below, ready to paint! (note a slightly modified cabin shape)
And here with Nacra beach cat outriggers (note photo shows the beam boxes wrapped in polythene)
So it is primarily designed for those who want to race, rather than those who just want a family daysailer.
However - like the Strike 16/18 - the Strike 20 also uses a beach cat for the outriggers and rig. In this case a F18, which are available worldwide at reasonable cost (for the older designs like Hobie Tiger and Dart Hawk). A Tornado or Hurricane 5.9 could also be used
The outriggers fold up, as on the Strike 18, the main hull cockpit is narrower so, despite the wider overall beam, the boat is still trailable.
There is just about room under the foredeck for a single berth, but the space is really there for a dry storage area and a small portapotti stowage. An option is to have a "goalpost" kingpost to allow access forward from the cockpit and under the mast. Or you can have a larger forward cabin area, as shown on the studyplan and in the top photo
The main hull is built in 4 and 6mm sheet ply
You can see a provisional studyplan HERE. Digital building plans cost GBP250. Please contact me by email if you wish to purchase plans. The drawings are now finished and the first few sets have now been sold. One to a builder in France who is using Nacra 5.8 hulls and a Tornado rig, see the photos shown here.
And see here for his building blog
Basic Materials List
5 sheets 4mm plywood
6 sheets 6mm plywood
2 sheets 6 or 9mm plywood
1in x 1in 15m
2in x 1in 50m
11/2in x 1in 7m
11/2in x 11/2in 10m
4in x 1in 12m
4in x 2in 2m
500g wood flour or similar filler
4kgs 200g glass cloth (biaxial +/-45deg recommended)
1000 stainless steel countersunk screws 3/4in x 6
filler/paint as required
All plywood to be best quality Marine grade Gaboon/okoume ply.
Sheet sizes are 8' x 4', 2440x1220
All timber to be at least "Joinery Quality".
Unless noted otherwise all timber is softwood, eg Douglas Fir, Sitka Spruce, Yellow Cedar or similar.
All timber is "PAR", or "Planed all Round".
Thus sizes given are nominal, ie 2" x 1" has a finished planed size of approx 45mm x 20mm.
(Note: It is usually cheaper to buy wider planks, eg buy 2" x 1" and cut it in half to create 1" x 1").
Epoxy glue is recommended for all glue joints
as it is gap filling and the strongest and most watertight glue
List excludes errors and waste
Please email me for further details