Armstrong S1 (Step 1) S1 1550 hydrofoil front wing: 1,550 cm², 905 mm span, aspect ratio 5.30, 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 |
|---|---|---|---|---|---|---|---|
| Takoon | Starter Front Wing 1600 | 1,600 | +3.2% | 5.50 | +3.8% | 940 | C1 Low aspect |
| Takuma | Kujira Helium Front Wing Kujira Helium 1500 | 1,500 | -3.2% | 5.52 | +4.2% | 910 | C1 Low aspect |
| North | Sonar MA1500v2 MA1500v2 | 1,500 | -3.2% | 5.60 | +5.7% | 920 | C1 Low aspect |
| Family | S1 |
|---|---|
| Size | S1 1550 |
| Area, cm² | 1,550 |
| Area basis | unknown |
| Span, mm | 905 |
| Chord, mm | — |
| Aspect ratio | 5.30 |
| 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.