Armstrong Surf 42L 4'9

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Build hard Disciplines prone

The Surf has 7 sizes in the current range, from 20 to 48 L. Its slenderness, 2.91, is greater than that of 48% of the 1,895 current boards that publish a length and a width.

Closest boards from other brands

Mount is shown beside each board, never matched on.

Current boards from other brands within ±7% of volume and ±2% of length, and ±2% of slenderness where both publish a width of the Armstrong Surf 42L 4'9, closest first.
BrandBoardVolume LΔ volumeLength mmΔ lengthSlendernessMount
GONGSurf Foil Board Lemon FSP Pro 2026 4'944+4.8%1,448+0.0%2.89 (-0.6%)twin-track
GONGSurf Foil Board Lethal FSP Pro 2026 4'940-4.8%1,448+0.0%2.92 (+0.4%)twin-track
GONGSurf Foil Board Lethal FSP Pro 2026 4'1042+0.0%1,473+1.7%2.92 (+0.3%)twin-track
GONGSurf Foil Board Lemon FSP Pro 2026 4'842+0.0%1,422-1.8%2.89 (-0.6%)twin-track
Lift Foils4'8 40L Prone40-4.8%1,422-1.8%——
OmenFlux V2 40L40-4.8%1,422-1.8%2.94 (+1.3%)—

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 it42L 4'9
Volume, L42
Length, mm1,448 (4'9")
Width, mm498
Thickness, mm76
Weight, kg—
Slenderness (length ÷ width)2.91
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.

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