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The SRW (Semi Rigid Wing) uses our patented technology to create a rigid frame system for the wing without the need for heavy and complicated structures to be hoisted with the sail membranes.  The term “Semi Rigid Wing” refers to the flexible nature of the system.  The patented control methods provide the wing with morphing characteristics within a light, robust, simple sail system.  So, wing shapes can be varied to suit the point of sail, from extremely high lift to drag ratio wings for upwind, to highly cambered, powerful wings for sailing wider angles.  Combined with the unique span-wise control of twist and section thickness this gives an unrivalled degree of flexibility in shape.

Moreover, the rigidity of the system leads to very stable aerodynamic performance.  No luffing, flapping or flogging translates into easier, faster sailing and longer sail life.

Improving aerodynamic stability has a direct benefit in improving hydrodynamic performance.  Instability leads to the need for greater control input.  That is, less rudder (and foil) adjustment and less sheet adjustment.  Adjustments to control surfaces typically has a drag penalty.  (It also has an energy requirement from crew or stored power).  The increase aerodynamic stability of the SRW leads to reductions in hydrodynamic drag.  So, the benefits seen are greater than just an improvement in sail power.

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Benefits of the

Semi Rigid Wing

  • Good aerodynamic characteristics

–High Lift/Low Drag

–Large angle of attack range

–Asymmetrical section works on Port and Starboard tacks

–Low tacking drag as foil is thin and symmetrical through tacks

  • Robust

–Minimal parts

–Will survive capsize

–Supports headsails, code sails, spinnakers

–Long service life (more stable, no flapping or flogging)

  • Easy handling/stowage

–Mast easily installed with small crew

–Membranes can be boom stacked

–Slab reefing

–Two piece mast

  • Easy maintenance

–Possible to replace battens (wing ribs) in-situ

–Membranes easily removed

  • Low weight

–Comparable to wing mast/sail

  • Cost effective

–Small premium over conventional main sail

  • Can be optimised for the platform design


SRW Operation

  • Counter rotating spar rotation compresses leeward battens to induce thickness

  • Creates a substantially rigid airframe that resists aeroelastic collapse

  • Outhaul controls additional camber

  • Leach slip control upper section thickness

  • Main sheet controls twist

  • Thickness, camber and twist can all be controlled easily while sailing

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SRW Race

  • TP52 – IRC Optimisation

  • Mini 650

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SRW Cruise

Key features include:

  • Reefable – the system is easily slab reefed and can be supported by lazy jacks. Wing thickness and twist can be controlled in reefed configuration.

  • Small, no overlapping, self tacking headsails – the SRW aerodynamics is complemented by a smaller headsail configuration meaning self tacking headsails can be used with no loss of performance.

  • Supports code sails – the SRW will support spinnakers and furling code sails which makes downwind sail handling much easier.

  • No flapping or flogging – the SRW’s unique design feathers to a flat sail when taking or even when motoring head to wind. Is does not flap from side to side. This gives a quieter, less stressful cruising experience.

  • Easy stackingThe SRW stacks easily and with the addition of lazy jacks this is a simple operation. Add a sail catcher, which doubles as a cover and the sail can be stowed very quickly – leaving more time to enjoy the surrounds.

The SRW is a smart choice for a performance cruising yacht. It combines high performance with easy handling.


The forgiving nature of a the SRW means it does not luff, is easier to steer and will work very effectively with autopilots.

The wing membranes are lightweight but also long lasting. They can be made from a variety of sail fabrics to ensure both longevity and performance. Electronic control can be added to the SRW to automate tacking and to provide push button mast rotation control.

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SRW Custom

Advanced Wing Systems can support you in the development of an SRW package to suit you project.  The engineering and performance benefits of the SRW mean it is well suited to projects for larger monohulls or multis.  The aerodynamic stability means that high performance yachts will benefit particularly from the SRW.  We can work with your project team to ensure the optimum outcome.

  • Flexible rigging configuration


  • Flexible sail plans


  • Hydraulic, electro-mechanical or manual control


  • Flexibility with construction materials

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