Armstrong, 2025

Downwind Ocean Mk III

2591mm long · 8'6"

438mm wide

149mm thick

115litres

Open in Studio See it on armstrongfoils.com

Sizes & Numbers

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

In one line

Longer and leaner than most. A pin tail, a medium nose and curvy rails.

derived · against the 66 other downwind foil boards in the atlas, read off the outlines.

As listed by Armstrong

Armstrong Downwind Ocean Mk III: every size as listed by Armstrong
size	length	width	thickness	weight
95 L	7’8 · 2337 mm	426 mm	143 mm	5.6–5.9 kg
105 L	8'2 · 2489 mm	432 mm	146 mm	5.8–6.2 kg
115 L	8'6 · 2591 mm	438 mm	149 mm	6.3–6.8 kg
125 L	8’10 · 2692 mm	438 mm	152 mm	6.6–7.1 kg

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

Next to your board?

Lay the Armstrong Downwind Ocean 115 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 95 L outline · derived

51 %wide point, 1192 mm from the tail

5.60length over width

247mm wide 12″ from the tail

7,523cm² of planform

Read off the 105 L outline · derived

51 %wide point, 1268 mm from the tail

5.76length over width

245mm wide 12″ from the tail

8,266cm² of planform

Read off the 115 L outline · derived

51 %wide point, 1320 mm from the tail

6.01length over width

239mm wide 12″ from the tail

8,584cm² of planform

Read off the 125 L outline · derived

51 %wide point, 1378 mm from the tail

6.23length over width

232mm wide 12″ from the tail

8,940cm² of planform

Rocker of the 95 L · scaled from the 115 L measured

109 mmtail rocker, at the tip

40 mm12″ from the tail

59 mm12″ from the nose

163 mmnose rocker, at the tip

641 mmflat to within 3 mm, from 31 % to 58 % of the length

42 %of the length to the lowest point, from the tail

159 mmat its thickest, 38 % from the tail

78 mmlonger along the bottom curve than flat

Lay this rocker over other boards

Rocker of the 105 L · scaled from the 115 L measured

117 mmtail rocker, at the tip

45 mm12″ from the tail

67 mm12″ from the nose

174 mmnose rocker, at the tip

666 mmflat to within 3 mm, from 31 % to 58 % of the length

42 %of the length to the lowest point, from the tail

163 mmat its thickest, 38 % from the tail

83 mmlonger along the bottom curve than flat

Lay this rocker over other boards

Rocker of the 115 L · measured

122 mmtail rocker, at the tip

48 mm12″ from the tail

72 mm12″ from the nose

182 mmnose rocker, at the tip

683 mmflat to within 3 mm, from 31 % to 58 % of the length

42 %of the length to the lowest point, from the tail

166 mmat its thickest, 38 % from the tail · on the photo; Armstrong lists 149 mm

86 mmlonger along the bottom curve than flat

Lay this rocker over other boards

Rocker of the 125 L · scaled from the 115 L measured

128 mmtail rocker, at the tip

52 mm12″ from the tail

77 mm12″ from the nose

190 mmnose rocker, at the tip

700 mmflat to within 3 mm, from 32 % to 58 % of the length

42 %of the length to the lowest point, from the tail

170 mmat its thickest, 38 % from the tail

90 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 · Measured on Armstrong's photo of the 115 L. Tail end set by Armstrong's photo convention, not checked by a person.