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For strong, committed, bottom turns in side-off conditions, and unrivaled stability in gusty conditions, nothing compares to the 2019 Viper. Combine this classic plan-form with an ultra-modern Twaron membrane, and you create an unrivaled synergy of cutting edge construction and classic feel. This sail remains nicely centered, without shape migration, even in the upper range. While the Viper is absolutely dedicated wavesail, it works marvelously as a cross-over on bump & jump days. If you like a lightweight, agile, ripping wavesail, grab a Viper and experience the very best.

“The Viper shares many of the design characteristics of my earlier work in wavesails. What sets it apart is the unique feel of the membrane, and the associated durability and performance that is inherent to the high-concentration of strategically placed Aramid fiber. Like all Avanti products, each individual sail size is CNC strung, and laminated according to it’s own unique fiber map. While the unmatched investment in time and precision is daunting, the end result is really something special.”

– Dan Kaseler

New in 2019

More set shaping along the bottom batten. Ensuring continuous drive and stability. The curvature telegraphs up through the sail body giving it direction and drive.

HD Membrane Matrix. Slightly thicker film gauges and robust fiber mapping provide maximum strength and durability.

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Hotspot Trajectories. Extra fiber density on centenary between clew and focal point of luff curve keep shape from migrating upward.

Helix Leech Plys. Sine wave leech reinforcements minimize cyclical flexing along any given line and extend toughness against flutter degradation.

Performance & Durability

Rainbow Batten Trajectories. Rainbow Batten Trajectories minimize pocket stretch and ensure rigged symmetry.

Anti-Abrasion. Anti-Abrasion Silicon Bumpers prevent unnecessary wear. MicroLight Batten Tensioners provide balanced skin tension.

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Maximum Weight Reduction

Ultra lightweight. Feather Weight Construction puts this sail’s weight 15-20% under industry standard.

Visibility. Cobra Vision Window yields good visibility while maintaining the integrity of the membrane in critical high-stress areas.

Advanced Fibers

GemTone Fiber. Enriches color weight and vibrancy on the water and ensures sails that are lighter, stronger, and more durable than the competition.

Updated Fiber Map. HotSpot clew to luff trajectories keep shape locked low and forward.

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Sail Foot

Lightweight Components

Nylatron Tack Pulley. Super lightweight ‘Nylatron’ tack pulley wheels save weight and allow easy downhauling.

Kevlar Reinforced Fairings. Reinforced head and tack fairings give maximum durability against abrasion.

Extended Toughness

  • Helix Leech Plys minimize cyclical flexing along a given line and extend toughness of leech.
  • Teijin 8083 luff sleeve material gives excellent durability and repels water.


3.53501421240Avanti Spine 3402.3
4.0374151650Avanti Spine 3702.5
4.23811541250Avanti Spine 3702.6
4.53891582150Avanti Spine 3702.7
4.73991613050Avanti Spine 3702.9
5.04101661250Avanti Spine 4003.0
5.54251772750Avanti Spine 4003.1
6.04461871850Avanti Spine 4303.2

Technical Layout