$100 PDF Plans & Hull License
If your email inbox can receive 12+MB, we will send you the same pdf plans & hull license (normally $150USD) via email & you won’t have to wait forever for snail mail or have your order get stuck in customs.

We’re now up to Hull License #600 with the latest two plan sets going to Western Australia! See our Home Page for more details.

The i550 is easy to construct, even for even the amateur builder, with a plywood “stitch-and-glue” method that ensures a light, solid hull, and a quick build. Or, to save drawing and cutting time, you can buy a kit from us, cut from the master templates or full-size paper patterns that are very accurate. Here’s the specs: 18 feet LOA, 8 ft. beam, a lifting bulb keel, draft 4 feet 5 inches, and 10 inches of depth for easy trailering. Class weight is 800 lbs. Main and jib: 236 sq. ft., with Asym: 600+ sq. ft., SA/D: 42 upwind, downwind 112, (translation: faster than a stepped-on cat).

The i550 is annoyingly fast and has troubled much larger sportboats, like Elliot 7’s and a Melges 24.

The first i550 was launched in Australia a few years ago, home built by Andrew Clauson. It is the fabled Tokyo Trash Baby of YouTube fame.

The i550 is a big winner in the bang for the buck department. You’ll not only have the satisfaction of crafting your own sportboat, but think of the $25 or $35 thousand dollars you’ll be saving. Resourceful scavengers can put one together for $6,000 or less (US). Double that and you’ll have a carbon spar, fine sails, nice foils by a skilled maker and new everything.
Following the plan set page by page, with the parts diagrams and instructions, the boat will come out right.
The rig has height and length limits, but the layout of the deck and cockpit are open to interpretation. Construction is simple stitch and glue plywood, epoxy and glass. Two people can have the hull looking like a hull in a weekend.
Put in the transom and bulkheads next while it is right side up. Epoxy coat and glass tape the parts in place and roll it over. Fair the bottom and fiberglass cloth it. There is room down below for simple camping style. Plenty of room on deck gives you room to move around. The lifting bulb keel gives stability and righting moment, but, most importantly, lets the boat launch easily at any boat ramp.
The plan’s pack consists of construction notes, suggested bill of materials, profile, plan and section views, nesting diagram, hull panel diagrams, frame diagrams, interior diagrams, keel and keelbox diagram, rudder diagram, cabin trunk diagram, deck layout and a rigging diagram. The plans pack is in a notebook-ring binder. Plans include both the standard and the extended cockpit version. Some creative builders are even building flush deck versions, and the Portland Group, who formed the North American Class (NA.org) have perfected the rounded flush deck version.
The mast can be obtained through a number of sources (both aluminum and carbon fiber). We will soon be offering keel bulbs and keels, ballast bulb molds and rudders. We also will build the i550 for you to any stage of completion. Clubs are especially encouraged to inquire. Before and after any purchase, Also, we are always here to answer your questions, anytime by email or phone. Five are now sailing in Australia. Many other builders, who have bought kits or full sized paper plans, are making great progress and we expect those i550s to start launching soon. (These guys have done an incredible job with their boats!)
We are quickly approaching 601 plan sets sold throughout the world (map), including Australia, Slovenia, Italy, Denmark, Germany, Brazil, Greece, Singapore, South Korea, Canada, Thailand, The Netherlands, The Czech Republic, England, Norway, Spain, Shanghai, Poland, Belgium, Argentina, Finland, Chile, The Philippines, throughout the UK, Croatia, Sweden, The Ukraine, Turkey, Egypt, India, Jamaica, Martinique and many more. Check out the map page for updates … we always have a few more to add.

Other i550 Sites and Forums for New Members to Check Out:




Sailing Group Links:

Harry Pattison
Sailmakers, not sail sellers!
Loft: 949 645-6697
Cell: 949 275-3302

i550 Class Associations (Currently Forming and listed by Date):

1. The i550 North American Class Association (NACA) have their website at www.i550NA.org.
2. The i550 Class Association at i550class.org.

Happy Sailing!
Tim Reiter & Susan James