Armstrong S1 (Step 1) S1 1250 hydrofoil front wing: 1,250 cm², 848 mm span, aspect ratio 5.70, with its closest equivalents from other brands within ±5% area and ±8% aspect ratio. Figures from Armstrong's own published specifications.
Projected and flat area run 3–8% apart. A marked area is one whose brand does not state which it publishes, so a match inside the area tolerance may be comparing unlike figures.
| Brand | Wing | Area cm² | Δ area | Aspect ratio | Δ AR | Span mm | Band |
|---|---|---|---|---|---|---|---|
| Naish | Ultra Jet Front Wing Ultra Jet 1250 | 1,250 | +0.0% | 5.60 | -1.8% | 835 | C1 Low aspect |
| ENSIS | PACER Front Wing 1250 | 1,250 | +0.0% | 6.00 | +5.3% | 864 | C1 Low aspect |
| RRD | Blaze LTE Front Wing Y30 1250 | 1,250 | +0.0% | 6.00 | +5.3% | 865 | C1 Low aspect |
| F-One | PHANTOM Carbon PHANTOM 1280 | 1,280 | +2.4% | 5.90 | +3.5% | 870 | C1 Low aspect |
| Slingshot | One-Lock Ease 1250 | 1,250 | +0.0% | 5.30 | -7.0% | 817 | C1 Low aspect |
| Takuma | Kujira Helium Front Wing Kujira Helium 1200 | 1,200 | -4.0% | 5.50 | -3.5% | 815 | C1 Low aspect |
| Cabrinha | Fusion X-Series MkII X1240 | 1,240 | -0.8% | 6.10 | +7.0% | 870 | C2 Mid-low aspect |
| Lift Foils | 200 Surf V2 Front Wing 200 | 1,290 | +3.2% | 5.40 | -5.3% | 826 | C1 Low aspect |
| Lift Foils | 200 Havoc LCS Front Wing 200 | 1,290 | +3.2% | 6.10 | +7.0% | 889 | C2 Mid-low aspect |
| Axis | SP (Surf Performance) SP 860 | 1,293 | +3.4% | 6.10 | +7.0% | 860 | C2 Mid-low aspect |
| Family | S1 |
|---|---|
| Size | S1 1250 |
| Area, cm² | 1,250 |
| Area basis | unknown |
| Span, mm | 848 |
| Chord, mm | — |
| Aspect ratio | 5.70 |
| Band | C1 Low aspect |
| Brand files it under | Entry |
| Disciplines | wing, prone |
| Construction | carbon |
| Model year | 2025-2026 |
| Source | manufacturer |
The brand's published aspect ratio agrees with its own span and area (span² ÷ area) to within 5%, so the figure is confirmed.
See Armstrong on the plot →Data current to August 2026. Fast Bobby is the researcher, never the reviewer: every figure above is the manufacturer's published claim, converted to comparable units, and nothing here is a riding impression.