Armstrong Surf 20L 3'11

View on Armstrong (opens in a new tab)

Build hard Disciplines prone

The Surf has 7 sizes in the current range, from 20 to 48 L. Its slenderness, 2.76, is greater than that of 38% of the 1,895 current boards that publish a length and a width.

Closest boards from other brands

No current board from another brand is within ±7% of volume and ±2% of length, and ±2% of slenderness where both publish a width of this one.

The nearest current boards

None of these is within the tolerances above: each misses on volume, length or slenderness by up to 2.1× the tolerance.

The current boards from other brands nearest the Armstrong Surf 20L 3'11, closest first. None is within ±7% of volume and ±2% of length, and ±2% of slenderness where both publish a width.
BrandBoardVolume LΔ volumeLength mmΔ lengthSlendernessMount
AppletreeApple Skipper Short 3'10'' (18.4L)18.4-8.0%1,168-2.2%2.79 (+0.9%)twin-track
AppletreeAppleslice Prone 4'0'' (17L)17-15.0%1,219+2.1%2.75 (-0.7%)twin-track
DuotoneStrider SLS Wake 2026 3'10''17-15.0%1,170-2.0%2.75 (-0.4%)twin-track

Specifications

Every figure is Armstrong's own, read from the source linked in the last row, converted to millimetres and kilograms where the brand prints inches or pounds. Slenderness is computed here, length ÷ width.
FamilySurf
ModelSurf
Size, as the brand prints it20L 3'11
Volume, L20
Length, mm1,194 (3'11")
Width, mm432
Thickness, mm51
Weight, kg—
Slenderness (length ÷ width)2.76
Slenderness band2.5–3.0
Mount—
Strap inserts—
Buildhard
Constructiondual i-beam carbon stringers, carbon fiber foil tracks
Disciplinesprone
Rider weight—
Rider level—
Model year—
Sourcemanufacturer · read 2026-10-02

Every figure above is the manufacturer's published claim, converted to comparable units.

All Armstrong boards · Armstrong on the Board Map · All foilboards