At 5m (16 ft) tall with 2.85m (16 ft) draught, this daggerboard is 150-200% bigger in area than the original 2 boards in most cats. 
The profile is a NACA 63-012 section which has good lift-drag characteristics. The large size means the operating range of the board is almost always inside the drag bucket, meaning less drag—more speed.
Whether you are building a new boat or retrofitting an existing one, this board will change the way you sail—forever.

A single large daggerboard

outperforms two smaller ones. Go as hard to wind as a keel yacht—but faster.

Add more speed to your boat

Add more space to your interior

One large board – is better than two 

Vortex losses around the bottom (tip) of a daggerboard make up a considerable percentage of the total drag. Why have two? Combining two boards into one big one means a longer chord, a higher Reynolds number and lower induced drag. The board operates at low angles of attack giving a higher Lift/Drag ratio, less side slip and better steering.

When I relaunched my cat with the new board, it was a different boat—completely. I could go upwind like a tractor at angles I’d never seen before—and fast. But I could also slow down and still go upwind as good as any keel yacht when the weather got rough. 

Steering was light even in the heaviest of conditions, the boat tracked like it was on rails. Asymmetric drag is undetectable. Raising or lowering the board while running downwind, makes no difference to the speed or helm.

Building one daggerboard and case is quicker than making and installing two. And as a bonus, you have full use of the other hull—a perfect place for the galley.

21 years sailing – still looks like new

The board has been in use for the last 21 years and still looks like the day it was built. Despite hitting the bottom (and coming to a dead stop from 5kts) when I owned the boat and plenty of stormy weather sailing over the years. Living proof of the excellent strength and more importantly fatigue strength, of wood, epoxy and e-glass. This board is designed strong, it will outlast your boat.

Shave days off windward passages

With its large chord, deep draught and glass-smooth white surface, this board cuts through the water like a knife. Go to wind—fast…


TE30 – a smaller version to suit 30ft catamarans

A new, smaller version of the TE40 board is now near completion and available for pre-purchase. If you are keen to get started, planning and building your board now, you can. Drawings will be emailed to you personally, over the next month as they roll off the drawing board; so you can get planning and building. Click the button below to learn more.

Build at home

with simple materials

  • Plywood
  • E-glass
  • Epoxy
  • Paint

There is nothing low-tech about building in plywood, in fact, the opposite is true. Wood/glass/epoxy are the perfect materials for this job. Flexing continuously for years requires high fatigue strength— exactly where wood and epoxy excel.

Engineered for your boat

Buy plans – and make your own board. Each set of plans comes with engineering. The fibreglass layup of board and case are tailored specifically for your hull.

Every boat is different, hull shape, material, room to install. The loads on the board will be different depending on how it’s installed, the boat’s weight, size of rig, etc. Plans for each board and case are adjusted individually, to suit your boat.

Get Started

Change your boat’s performance

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