C-Tech has recently completed a set of J-foils for an SL33 using a new construction method. Utilising previous experience gained from Americas Cup foil projects we developed a full composite elbow join. Previous J foils had been manufactured with a metal elbow to join the main shaft to the lifting surface. This was to overcome high loading in this area. Metal elbows alone can be up to 40kg if there is a large radius in the design. C-Tech developed a method that would make a full composite foil possible. An elbow was tested to verify the construction method and the results exceeded all expectations. It was in fact the testing jig that failed at a load double of what the designers were expecting.
The finished J -foils weigh 34.5 kg and are stronger, lighter and stiffer than superseded set. The key to the success of this project has been in developing a cost-effective manufacturing method that enables the right mix of off-axis fibre in the elbow that has been consolidated by autoclave pressure.
The finished full carbon SL33 foils at 34.5kg being lighter, stronger and stiffer than previous versions.
Originally developed for the TP52 class spinnaker clew rings where Titanium is banned. These rings a constructed from a single tow of carbon fibre with a 3,200kg breaking load.
Carbon rings will not rust.