outperforms two smaller ones. Go as hard to wind as a keel yacht—but faster.
Vortex losses around the daggerboard tip make up a considerable percentage of the total drag. One board cuts that in half. Combining two boards into one increases chord, giving a higher Reynolds number and lower induced drag. The larger surface area means the board operates at much lower angles of attack resulting in a higher Lift/Drag ratio, less side slip and much better steering.
Unhappy with my original windward performance I went back my boat shed and built a solution.
When I relaunched my cat it was a different boat—completely. I could go upwind like a tractor at angles I’d never before seen—and fast.
More importantly, I could go upwind slowly. When the weather turns foul this ability is so important.
The steering remained light even in the heaviest of conditions and the boat tracked like it was on rails.
Asymmetric drag is undetectable, it makes no difference on what tack, 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—usually where the galley is.
My original board has been in use for the last 22 years and still looks like the day it was built, despite hitting the bottom (coming to a dead stop from 5kts on sand). I encountered plenty of stormy weather sailing over the years, operating under high load. Living proof of the excellent outright strength and fatigue strength, of wood, epoxy and e-glass as a system. Simple, inexpensive, readily available materials do the job just fine.
A smaller version of the TE40 board is now available for purchase. If you are keen to get started, planning and building your board now, you can. Click the buttons above or below to learn more.