Mount twin-track Build hard Disciplines prone, wing 2020-2021
The Prone Foil has 3 sizes on record, discontinued sizes included, from 35 to 49 L. Its slenderness, 2.85, is greater than that of 44% of the 1,895 current boards that publish a length and a width.
No current board from another brand is within ±7% of volume and ±2% of length, and ±2% of slenderness where both publish a width of this one.
None of these is within the tolerances above: each misses on volume, length or slenderness by up to 1.7× the tolerance.
| Brand | Board | Volume L | Δ volume | Length mm | Δ length | Slenderness | Mount |
|---|---|---|---|---|---|---|---|
| GONG | Surf Foil Board Lethal FSP Pro 2026 4'10 | 42 | +7.7% | 1,473 | -3.1% | 2.92 (+2.5%) | twin-track |
| Takuma | Morning Sun 40L | 40 | +2.6% | 1,473 | -3.1% | 2.83 (-0.7%) | — |
| F-One | ROCKET SURF 4'11 | 40 | +2.6% | 1,500 | -1.3% | 2.94 (+3.3%) | twin-track |
| Family | Prone Foil |
|---|---|
| Model | Prone Foil |
| Size, as the brand prints it | 5'0" |
| Volume, L | 39 |
| Length, mm | 1,520 (5'0") |
| Width, mm | 534 |
| Thickness, mm | 78 |
| Weight, kg | 3.7 |
| Slenderness (length ÷ width) | 2.85 |
| Slenderness band | 2.5–3.0 |
| Mount | twin-track |
| Strap inserts | — |
| Build | hard |
| Construction | — |
| Disciplines | prone, wing |
| Rider weight | — |
| Rider level | — |
| Model year | 2020-2021 |
| Source | manufacturer · read 2026-10-02 |
Every figure above is the manufacturer's published claim, converted to comparable units.
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