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Foil Strongbox
$179.00
Excl. tax
Patented carbon fiber foil mount compatible with Tuttle heads up to 71mm and standard plate mount bases. The strongest, most versatile foil mounting system available for SUP and prone boards. Read more..
In-Store Pickup Available
Blue Planet Surf Kaka'ako
1221 Kona St, Honolulu, HI
About the Foil Strongbox
The Blue Planet Foil Strongbox is a patented design made to optimize the performance and compatibility of your foil SUP or surfboard. Made of carbon fiber and high density PVC foam, it fully integrates both a Tuttle mount with two plate mount boxes — making your board compatible with almost any foil on the market today.
The Foil Strongbox provides unparalleled strength and rigidity when installed according to instructions. All Blue Planet SUPs and prone foil boards feature this patent-pending design. Also available on Amazon if sold out here.
Trade pricing available for bulk orders. Foil Strongbox™ is a patented design (US patent #10773775).
Specs
- Dimensions: 11.2" x 5.5" x 5.13"
- Weight: 34 oz (approx)
- Maximum board thickness at foil placement: 5.13" (without modification)
- Compatible with Tuttle heads up to 71mm in depth
- Compatible with standard plate mount mast bases
- Material: carbon fiber and high density PVC foam
Installation Guide
Tuttle vs Plate Mount Comparison
Installation Steps
- Measure location and mark top and bottom.
- Drill pilot holes from top and bottom, cut out with long blade.
- Measure and cut Foil Strongbox to fit thickness of board.
- Remove deck pad around box, tape off deck opening, and cover with plastic-covered wood piece.
- Apply gorilla glue to box and board, wet with water mist.
- Adjust box to be flush, plumb, and square before glue sets.
- Trim excess glue and prep for glassing.
- Glass with 3 layers carbon, plus one layer 4 oz glass to prevent seepage on bottom. Cover with plastic.
- Sand and hotcoat.
- Cut out box openings with pilot holes using trim router.
- Drill Tuttle holes with long drill bit.
- Place washers over holes on deck and cover with deck pad.
Trim router bit recommendation: Freud 1/4" Solid Carbide Bevel Trim Bit (66-100)
Box Placement Guide
Recommended distance from tail of board to back of Tuttle opening:
| Board Length | Distance from Tail |
| 3'0" to 4'6" | 1" to 6" |
| 4'6" to 4'11" | 4" to 8" |
| 5'0" to 5'9" | 6" to 12" |
| 5'10" to 6'6" | 8" to 15" |
| 6'7" to 7'4" | 12" to 20" |
| 7'5" to 8'6" | 16" to 22" |
| 8'7" to 9'6" | 20" to 28" |
- Prone surfboards generally need the box further back than a SUP.
- Box placement further forward creates greater lift and earlier planing.
- Box further back improves turning ability.
- Lightweight riders need less lift; heavier riders need more — factor this into placement.
Compatibility Notes
The Foil Strongbox is designed for foils with square or straight deep Tuttle heads, as found on GoFoil, Blue Planet, and many other surf foils. If your foil has an angled head where screws come out at an angle, the screws will not line up with the deck holes.
It is possible to use an angled Tuttle head by elongating the screw holes so the screws exit parallel to the mast. The Tuttle head is locked tight by being tightened between the angled front and back of the opening — a small gap between the head and the bottom of the box is intentional.
Compatible with Tuttle head sizes up to 71mm in depth, in addition to any standard plate mount mast base.
