Optimized versatility

QS ALLROUND

The fin that does everything well. Subtle tubercles on leading edge, NACA 0012 profile. +54% lift vs FCS M-5 with balanced performance in 80% of conditions.

ALLROUND

vs FCS M-5

The ALLROUND competes directly with the M-5 in the versatility segment. +54% advantage in average lift with better efficiency across the entire range.

Metric	ALLROUND	FCS M-5	Improvement
Avg lift	199.0 N	129.3 N	+54%
Avg L/D	5.00	4.48	+12%
Max L/D	9.10	8.06	+13%

Specifications

Geometry and materials

Height (L) 150.0 mm

Base (L) 155.4 mm

Max thickness (L) 25.58 mm

Rake 15°

Sweep 5°

Twist tip 1.5°

NACA profile 0012

Weight (L, laminated) 134 g

Biomimetics tubercles (subtle)

Material PA-CF + 3K Twill

System FCS II

Available sizes

Size	Height	Base	Area	Weight
S	125 mm	136.5 mm	236.5 cm²	90 g
M	140 mm	155.4 mm	295.9 cm²	126 g
L	150 mm	155.4 mm	313.4 cm²	134 g
XL	170 mm	187.4 mm	408.5 cm²	199 g
XXL	185 mm	205.4 mm	486.1 cm²	256 g

Final measurements and weights with epoxy coating + carbon fiber.

Biomimetic feature

Subtle tubercles

The ALLROUND carries a single feature: low-amplitude tubercles. Just enough to improve control without penalizing top speed.

Tubercles

Megaptera novaeangliae

Amplitude 1.5 mm, 3 cycles on leading edge. Delay stall with minimal drag penalty. The sweet spot between biomimetic performance and efficiency.

NACA 0012 profile

Lift/drag balance

Lifting profile that generates lift from low angles. Thicker than the 0008 to handle load during maneuvers without separating.

No serrations

Clean design

Clean trailing edge NACA 0012. Without the RADICAL's serrations, to prioritize speed and efficiency in the 5°–15° range.

CFD

Numerical performance

RANS k-ω SST simulation, fine mesh (~3M cells), 4 angles of attack. Fluid: real seawater at 7.5 m/s.

ALLROUND CFD animation — flow around the fin

Angle	Lift (N)	Drag (N)	L/D
5°	99.07	11.01	9.00
10°	198.62	21.13	9.40
15°	298.76	49.06	6.09
20°	398.79	247.50	1.61

ALLROUND CFD — pressure distribution and streamlines

Target

Versatile surfer

The fin that covers 80% of your sessions. Not too big, not too small. Not too aggressive, not too tame. It just works.

All-terrain

Works in beach breaks, point breaks, reef breaks. With board, without board. 2 to 8 foot waves. The fin you put on and never take off.

Balance

155.4 mm height for good grip + NACA 0012 profile for lift. Tubercles for control without penalizing drag.

Progression

Ideal for surfers leveling up. Forgives mistakes, rewards technique. It won't punish you like a fin that's too big.

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