A unique patented characteristic of the GEARBOX design, is the load beam collar. Location of the cup shaped beam is below the upper surface of the box. A high density material placed within the load beam, increases the bonding area for the bottom laminate. This is called a cover.
Selection of cover material is based on good resin adhesion characteristics. Installation bonds the entire cover into the collar. Turning the load beam collar into a strong structural entity that is efficient at load dissipation. The design of the collar results in a cover that has the greatest amount of exposed surface area possible. Allowing for a superior bond with the bottom laminate of the board.
A dam is a requirement for an under the glass system. It serves to provide a ramp over which the bottom laminate can be draped, allowing the dam to be exposed when the board is sanded. It also allows the grub screws to be protected during the laminating process.
Die cut masking tape is provided that fits the top of the dam to cover the slot and screws during lamination. The dam has high enough clearance above the bottom lamination to allow it to be sanded down to expose the slot and screws.
The fin slot provides the housing for the base of the fin, and is designed to provide a snug fit for the base. The GEARBOX slot also provides an 3/16" (5mm) of adjustment for the fin, allowing the fin position to be tweaked!
The slot supports both GEARBOX and DUAL TAB bases.
GEARBOX features a bridge at the center of the fin slot, on the bottom. This bridge serves to tie the two sides of the slot together for additional strength. Tying the sides together in this manner means the slot is less likely to spread apart under the loads applied to the base of the fin.
GEARBOX fin bases have a corresponding semi-circular notched cutout to fit over the bridge. Dual tab bases fit either side of the bridge.
GEARBOX utilizes two grub screws to lock the fin into the slot. The screws are tightened down into a notch in the fin base that pushes the fin down, locking it into the slot.
For side boxes the two screws are placed on the stringer side of the box. While the the center box the screws are on opposing sides of the box.
The GEARBOX fin bases is a full length base in order to provide the strongest support in the slot. This minimizes the amount of flex in the base of the fin allowing it to flex as designed.
The base features notches, on the side, onto which the grub screws land allowing for a compression fit into the box. These notches are designed to support adjustment of the fin position within the slot. The notch also minimizes the risk of the fin falling out of the box should the screws loosen.