in your shed, building something that will transform your cat. This will be the best investment in time and money you will ever make in your boat. Go to wind like a keel yacht – but faster.
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 – means a longer chord and the advantage of higher Reynolds number.
When I relaunched the cat with the new board, I didn’t recognise my boat. I could go upwind like a tractor – only fast. But I was also able to sail slowly, in heavy weather, and still go upwind like a keel yacht. Steering was light even in the heaviest of conditions. The boat tracked like it was on rails. Assymetric drag is undetectable.
Building one daggerboard and case is a lot quicker than making and installing two. And as a bonus, you have full use of the other hull; which could be a perfect place for the galley.
It ‘s easy to go fast in a cat, but when the weather turns against you, can you slow down, and still go to wind? This ability is important, but it’s not something many cats do well.
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