QS RADICAL
Full biomimetics: leading-edge tubercles, trailing-edge serrations and surface microchannels. Thick NACA 0012 profile. The fin with the highest absolute lift in the catalog. +55% lift vs FCS M-5.
RADICAL
vs FCS M-5
Thicker profile (NACA 0012), higher volume, full biomimetics. The highest absolute lift in the catalog. Designed for surfers who prioritize power and grip under any conditions.
| Metric | RADICAL | FCS M-5 | Improvement |
|---|---|---|---|
| Sustained lift | 200.5 N | 129.3 N | +55% |
| Sustained L/D | 5.15 | 4.48 | +15% |
| Max L/D | 9.09 | 8.06 | +13% |
Specifications
Dimensions and materials
Available sizes
| Size | Base | Height | Volume | Weight |
|---|---|---|---|---|
| S | 510 mm | 512.7 mm | 242 cm³ | 96 g |
| M | 525 mm | 532.8 mm | 291 cm³ | 112 g |
| L | 540 mm | 532.8 mm | 342 cm³ | 130 g |
Scaling factor design with thickness variations. All sizes maintain NACA 0012 profile and curvature parameters.
3 biomimetic patterns
Nature engineered in CFD.
Each feature is parameterized, simulated and optimized. Not decoration: performance validated with OpenFOAM RANS k-omega SST against a clean baseline (SPEED model).
Each feature was parameterized, simulated and optimized: 4 mm amplitude + 5 cycles (tubercles), 6 mm + 6 cycles (serrations), 0.5 mm + 8 channels (microchannels).
Leading-edge tubercles
4 mm x 5 cyclesInspired by humpback whale (Megaptera novaeangliae) flippers. Delay stall, improve control at high angles of attack. +18% lift at 20° vs clean baseline.
Trailing-edge serrations
6 mm x 6 cyclesInspired by great horned owl (Bubo virginianus) feathers. Reduce hydrodynamic noise and improve efficiency. +9% L/D at 10° vs clean baseline.
Surface microchannels
0.5 mm x 8 channelsInspired by great white shark (Carcharodon carcharias) dermal denticles. Reduce skin friction. -12% drag at 15° vs clean baseline.
CFD
Validated simulation
k-omega SST turbulence, fine mesh (~3M cells), 4 angles of attack. Fluid: real seawater at 7.5 m/s.
| Angle | Lift (N) | Drag (N) | L/D |
|---|---|---|---|
| 5° | 101.45 | 11.10 | 9.09 |
| 10° | 200.48 | 22.05 | 9.09 |
| 15° | 312.67 | 56.28 | 5.56 |
| 20° | 404.35 | 202.18 | 2.00 |
Materials
High-performance manufacturing
PA-CF (carbon-fiber nylon) with 3K Twill reinforcement and epoxy coating. Standard FCS II system. The heaviest fin in the QS series at 130 g — because it packs the most technology per gram.
Maximum lift
532.8 mm height with the thickest NACA 0012 profile in the catalog. More volume, more lift. For absolute grip and stability.
3 patterns integrated
Tubercles + serrations + microchannels working simultaneously. Simulated and validated as a complete system. Maximum performance, no compromises.
Heavy but solid
130 g in size L. The heaviest in the QS series. Every gram is invested in biomimetic technology. For surfers who prioritize grip and stability.