North Sonar HA850 HA850 hydrofoil front wing: 850 cm², 920 mm span, aspect ratio 10.00, with its closest equivalents from other brands within ±5% area and ±8% aspect ratio. Figures from North'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 |
|---|---|---|---|---|---|---|---|
| Axis | ART (AXIS Research Team) ART 899 | 850 | +0.0% | 9.76 | -2.4% | 899 | C4 High aspect |
| Naish | Jet HA Front Wing Jet HA 840 | 840 | -1.2% | 9.80 | -2.0% | 900 | C4 High aspect |
| Cabrinha | Fusion H-Series MkII H850 | 850 | +0.0% | 9.53 | -4.7% | 900 | C4 High aspect |
| Code Foils | S Series Front Wing 850S | 850 | +0.0% | 9.50 | -5.0% | 900 | C3 Mid aspect |
| Omen | Operator 850 Operator 850 | 850 | +0.0% | 9.50 | -5.0% | 900 | C3 Mid aspect |
| GONG | Veloce V3 Atmo M | 890 | +4.7% | 10.10 | +1.0% | 950 | C4 High aspect |
| Armstrong | HA (High Aspect) HA880 | 880 | +3.5% | 9.68 | -3.2% | 923 | C4 High aspect |
| Axis | Surge Surge 890 | 835 | -1.8% | 9.50 | -5.0% | 890 | C3 Mid aspect |
| Unifoil | Evolution 135 Evolution 135 | 871 | +2.5% | 9.40 | -6.0% | 903 | C3 Mid aspect |
| F-One | EAGLE HM Carbon EAGLE 890 | 890 | +4.7% | 9.60 | -4.0% | 925 | C4 High aspect |
| Sabfoil | Razor PRO 875 Razor PRO 875 | 843 | -0.8% | 9.20 | -8.0% | 880 | C3 Mid aspect |
| RRD | Dynamic Pro Flying Fish Front Wing Y31 830 | 830 | -2.4% | 10.65 | +6.5% | 940 | C4 High aspect |
| GONG | Veloce Free Fly (FF) V3 Atmo M | 890 | +4.7% | 10.60 | +6.0% | 970 | C4 High aspect |
| Family | Sonar HA (High Aspect / Speed) |
|---|---|
| Size | HA850 |
| Area, cm² | 850 |
| Area basis | unknown |
| Span, mm | 920 |
| Chord, mm | — |
| Aspect ratio | 10.00 |
| Band | C4 High aspect |
| Brand files it under | Glide / high aspect |
| Disciplines | wing, race, kite, prone, tow, downwind |
| Construction | carbon pre-preg |
| Model year | 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 North 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.