QS SPEED
Clean design with no biomimetic features. Optimized for maximum L/D ratio with NACA 0008 profile. The most efficient fin in the catalog. +20% sustained L/D and +24% max L/D vs FCS M-5.
SPEEDvs FCS M-5
Thinnest profile (NACA 0008), lowest drag, highest L/D. Less absolute lift but much better hydrodynamic efficiency. For surfers who prioritize speed over pure maneuverability.
| Metric | SPEED | FCS M-5 | Improvement |
|---|---|---|---|
| Sustained lift | 162.3 N | 129.3 N | +26% |
| Sustained L/D | 5.36 | 4.48 | +20% |
| Max L/D | 10.01 | 8.06 | +24% |
Specifications
Dimensions and materials
Available sizes
| Size | Base | Height | Volume | Weight |
|---|---|---|---|---|
| S | 510 mm | 512.7 mm | 182 cm³ | 73 g |
| M | 525 mm | 532.8 mm | 219 cm³ | 86 g |
| L | 540 mm | 532.8 mm | 257 cm³ | 99 g |
Scaling factor design with thickness variations. All sizes maintain the NACA 0008 profile and curvature parameters.
Pure design
No biomimetics. Maximum efficiency.
The goal of this fin is to maximize L/D. Any biomimetic feature adds drag. No tubercles, no serrations, no microchannels. Just an NACA 0008 profile optimized with minimal sweep, rake and twist.
NACA 0008 profile with 4° sweep, 55° rake and 0.5° twist. Completely clean surface. Every parameter optimized by NSGA-II to maximize L/D in the 5°–15° operating range.
Max L/D
10.01 at 5°The best lift/drag ratio in the catalog. 24% better than FCS M-5 and 10% better than ALLROUND. Pure efficiency without compromises.
Ultra-thin profile
NACA 0008Only 12.4 mm max thickness. Half that of the RADICAL. Less frontal area, less drag, more top speed. For surfers who want to go faster.
Minimal twist
Only 0.5°The lowest cant angle in the catalog. Less flow correction, more direct response. The fin goes exactly where you point it.
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° | 85.54 | 8.50 | 10.01 |
| 10° | 162.28 | 16.30 | 9.96 |
| 15° | 243.42 | 37.49 | 6.49 |
| 20° | 324.56 | 147.49 | 2.20 |
Materials
Efficient manufacturing
Same manufacturing process as the entire QS series: PA-CF with 3K Twill reinforcement and epoxy coating. Standard FCS II system. The lightest fin in the catalog at just 99 g.
Maximum speed
532.8 mm height with the thinnest profile in the catalog. Less frontal area, less drag. Designed to go fast in a straight line.
Less is more
No tubercles, no serrations, no microchannels. Every gram of material and every millimeter of geometry is dedicated to speed.
Lightweight
Only 99 g in size L. The lightest in the QS series. For the surfer who notices every gram and wants maximum response.