When we go sailing, the boat may just push water out of the way (usually called displacement mode), ride on top of its own bow wave (planing) or foil. This week we look at how water resistance effects boatspeed, and what we can do to minimise this resistance.
The sailing world is going foiling mad. Time alone will tell whether it's a good thing or not, but what we can say is that it's fun and fast, and very different in feeling. What is the same for the sailor is that we need to understand a far greater range of sail settings in order to optimise the performances of these boats.
The Centre of effort of a rig can be best described by stating that the entire force of wind power generated by a sail can be considered to act through one point - in the same way that the center of gravity of a body is the point around which that body balances. In this blog, we explain the dynamics of the Centre of effort, how you can change it and WHY it needs changing, which is because if the center of effort of the rig isn’t directly over the pivot point of the boat, you need corrective rudder which will slow the boat down through drag in the water.
Speed and DRAG Boats are designed to go through the water, and over the past 70 years have been designed to ride ON the water. Over the past 10 years plus they’ve also been designed to fly over the water. These hull designs are termed as displacement (through the water), planing (riding on the water)... Continue Reading →