Armstrong S1 (Step 1) S1 2450 hydrofoil front wing: 2,450 cm², 1,054 mm span, aspect ratio 4.80, 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 |
|---|---|---|---|---|---|---|---|
| Sabfoil | Sea Devil 1040 Sea Devil 1040 | 2,445 | -0.2% | 4.42 | -7.9% | 1,040 | C1 Low aspect |
| Duotone | Lift 2400 | 2,400 | -2.0% | 5.10 | +6.2% | 1,110 | C1 Low aspect |
| North | Sonar MA2400v2 Prime MA2400v2 Prime | 2,400 | -2.0% | 4.50 | -6.2% | 1,040 | C1 Low aspect |
| Family | S1 |
|---|---|
| Size | S1 2450 |
| Area, cm² | 2,450 |
| Area basis | unknown |
| Span, mm | 1,054 |
| Chord, mm | — |
| Aspect ratio | 4.80 |
| Band | C1 Low aspect |
| Brand files it under | Entry |
| Disciplines | wing, prone |
| Construction | carbon |
| Model year | 2025-2026 |
| Source | manufacturer |
The brand publishes this aspect ratio, but its own span and area (span² ÷ area) give a figure 5–10% away. The published number is kept and marked.
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.