The Quadfoiler was originally a Nacra Inter 20 catamaran to which we added foils, sensors, and a kite. This boat represents our first attempt to translate what we had learned from the Trifoilers to a new boat, constructing our own sensor and foil system from scratch. On the Quadfoiler we also tried trailing sensors for the first time. The Trifoilers utilize a leading sensor system, wherein the points at which the wands hit the water are beyond the bow of the boat. The trailing sensor system means that the wands drag behind the bow. The advantage to the trailing sensor system is that it is possible to adjust the ride height of the boat on the fly by adjusting the length of the line that connects each J-foil to its corresponding sensor.
