The fin system in its entirety is lighter than fixed fins. Special care has been taken to ensure that only the finest weight to strength ratio compounds have been used.
There are numerous fin systems available internationally. In general the 4WFS is similar in weight, yet offers considerably more functionality.
The unique design of the box is designed to withstand significant external pressure whilst the disk and the fin are designed to snap off at strategic points ensuring that the box itself is not damaged. Nevertheless manufacturers are at liberty to determine the bonding strength of the box to the underside of the board itself by varying the strength of the resin mix.
No - this is firmly embedded into the underside of the surfboard.
No, the top deck won't collapse because the diameter of the ring appearing on the top deck allows for the foam to dent slightly under pressure without adversely affecting the integrity of the fibre glass.
Specialised plastics and carbon compounds.
No, the specialised materials selected for each component display very high durability properties.
All screws are made from marine grade stainless steel and will withstand the rigours of an ocean environment.
All holes use a router which is more accurate than a drill. For detailed installation procedures and specifications refer to the relevant installation guides available on this site.
17mm or 11/16"
Base length of oval = 3 7/8", width 1 7/8", depth of oval 1/8", depth of centre section (deepest) = 17mm or 11/16".
4WFS fins are all manufactured with 6 degree splay inbuilt into the side fins. All discs can be easily reversed to cater for extreme V's and concaves.
A total of 3/8" movement with 3/16" backwards is available. Manufacturers also have the option of positioning the boxes for maximum movement forward or backwards.
From it's central point fins can be rotated 5 degrees in each direction.
Yes, 4WFS have considered an alternative box for the rear fin. However, we want to retain the separate interface between fin and box in order for the fin to break away and not damage the box when hitting a reef etc.. It also allows for altering inaccuracies in installation by inserting alternative angled discs that compensate for human installation error.
The screws are designed to withstand normal usage. Care must however be taken to ensure that the Allen key is fully inserted into a clean and debris-free screw head prior to fastening. If the screws do strip it is usually possible to remove them by inserting a standard T10 Allen key. Should the above alternative fail, it is then recommended that, in the case of the panhead side screws, the head of the screw is removed using a metal M 4.5mm drill bit. Note that the drill process must be slow (preferably by hand) as the screw head is stainless steel and may melt under high drill speeds. Once the head is removed, the disc can be withdrawn from the box and the remainder of the screw shaft removed by hand.
No, all 4WFS components have been designed with very demanding tolerances. This is particularly so with the fin tab and interdisc which provides for a very tight and snug fit even before the grub screws are tightend. In effect the fin doesn't "wobble" when inserted into the disc (unlike other fin systems which rely solely on the grub screws for primary support) An added benefit is that the smaller lug allows for an overall lighter fin as opposed to fins that have the lug extending over a significant portion of the fin base. Furthermore, the fin is more likely to snap at the tab under severe side impact rather than damaging the board itself. Finally the absence of a lug on the rear of the fin provides additional acceleration when coming out of carving or snappy turns. Note that for the very large 4WFS templates, the lug has been positioned more forward than usual and modified manufacturers installation procedures are available for this purpose.