Duotone, 2026

Alfa HD (SB, incl. fin) 2026

2840mm long · 9'4"

890mm wide

≈ 163mm thick · estimated

210litres

Open in Studio See it on duotonesports.com

Sizes & Numbers

Listed by the brand, read off a photo, or worked out: where every number comes from

In one line

Its width sits further forward. A rounded pin tail, a full nose and parallel rails.

derived · against the 104 other windsurf boards in the atlas, read off the outlines.

As listed by Duotone

Duotone Alfa HD (SB, incl. fin) 2026: every size as listed by Duotone
size	length	width	thickness	weight
180 L	254 cm · 2540 mm	760 mm	≈ 183 mm · estimated	13 kg
210 L	284 cm · 2840 mm	890 mm	≈ 163 mm · estimated	14.8 kg
240 L	300 cm · 3000 mm	920 mm	≈ 171 mm · estimated	16.2 kg

Every size side by side, tails on one line, one scale

Next to your board?

Lay the Duotone Alfa HD (SB, incl. fin) 210 L over up to four others, at one scale.

Compare with…

Shape & Rocker

From above, then from the side, true scale · the chosen size solid, the others dashed

Read off the 180 L outline · derived

60 %wide point, 1518 mm from the tail

3.34length over width

522mm wide 12″ from the tail

16,081cm² of planform

Read off the 210 L outline · derived

60 %wide point, 1697 mm from the tail

3.11length over width

603mm wide 12″ from the tail

21,633cm² of planform

Read off the 240 L outline · derived

56 %wide point, 1671 mm from the tail

3.25length over width

640mm wide 12″ from the tail

23,294cm² of planform

Rocker of the 180 L · scaled from the 210 L, estimated

≈ 51 mmtail rocker, at the tip

≈ 28 mm12″ from the tail

≈ 45 mm12″ from the nose

≈ 137 mmnose rocker, at the tip

≈ 394 mmflat to within 3 mm, from 48 % to 63 % of the length

56 %of the length to the lowest point, from the tail

≈ 183 mmat its thickest, 59 % from the tail

≈ 42 mmlonger along the bottom curve than flat

Lay this rocker over other boards

Rocker of the 210 L · estimated

≈ 59 mmtail rocker, at the tip

≈ 34 mm12″ from the tail

≈ 56 mm12″ from the nose

≈ 155 mmnose rocker, at the tip

≈ 410 mmflat to within 3 mm, from 48 % to 63 % of the length

56 %of the length to the lowest point, from the tail

≈ 163 mmat its thickest, 59 % from the tail

≈ 46 mmlonger along the bottom curve than flat

Lay this rocker over other boards

Rocker of the 240 L · scaled from the 210 L, estimated

≈ 63 mmtail rocker, at the tip

≈ 36 mm12″ from the tail

≈ 61 mm12″ from the nose

≈ 164 mmnose rocker, at the tip

≈ 418 mmflat to within 3 mm, from 49 % to 62 % of the length

56 %of the length to the lowest point, from the tail

≈ 171 mmat its thickest, 59 % from the tail

≈ 49 mmlonger along the bottom curve than flat

Lay this rocker over other boards

True proportions · dots at 10 mm and 12″ in from each tip · bracket: flat to within 3 mm · On Duotone's photo of the 210 L, where its traced side holds 30 % more than the listed 210 L: probably shot from slightly above. Tail end set by Claude, not checked by a person. · estimated