All fins are manufactured by a temperature and pressure controlled RTM process. RTM (Resin Transfer Molding) is one of the best production techniques to manufacture composite parts. In contrast to hand laminating the fibers are still dry when the mold is closed. After closure resin is slowly injected. The major advantages over wet layup are:
- Very low void content (<1%). Air bubbles inside a laminate have a big impact on the structural properties of a laminate. Reducing voids equals increasing structural capacity. Increased structural capacity makes a more aggressive design possible. The process also delivers a perfect surface finish.
- High fiber volume fraction without distorting the fibers. Compressing the fibers before they are wet makes sure the fibers won’t shift during compaction. This is a crucial part in producing fins with consistent bending characteristics.