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Cruising Upwind Sails

Fusion M Sails

Fusion M® Performance Advantage

Using Quantum's state-of-the-art iQ Technology® design process, each Fusion M Cruising sail is developed and optimized specifically for your boat and sailing challenges—whether you're cruising around the world or simply making memories with your kids. The custom sail design is developed using the most advanced membrane construction and shaping methods in the industry to guarantee infinitely repeatable and unprecedented shapes for maximum control. Fusion M Cruising sails are the easiest to trim and most versatile tailor-made sail for your adventure.

A wide range of fiber-and-filament packages, combined with the latest skin options, offers whatever balance between pure performance and ultimate durability you need. From ultimate strength-and-weight ratio to sails tough enough to go around the world, Quantum's Fusion M series has you covered.

All Fusion M sails are available in square-top or pin-head options and a choice of gray or white taffeta protective skins.

Fusion M 8

Fusion M 8

Fusion M 8 is designed specifically for super yachts. This totally customized product is tailored to the unique demands of the world's ultimate sailing machines. The ultra high-performance fiber-and-filament package features a customized blend of carbon and aramid or Vectran® and aramid to maximize performance and longevity. The Quantum super-yacht design team works hand-in-hand with each project from start to finish.

Boat Size

50+ ft
15+ m


Carbon/Aramid or Vectran/Aramid


Fusion M 6

Fusion M 6

The Fusion M 6 is made for the high-load demands of larger cruising boats, multihulls, and serious cruisers who refuse to compromise. A custom aramid/carbon fiber blend gives the Fusion M 6 the precision shape of a racing sail with the rugged reliability and long-term durability of a cruising sail. Fusion M 6 provides not only initial shape holding, but also dramatically increases shape life for superior performance, control of heel, ease of trim, and improved reefing and furling.

Boat Size

35-80 ft
10-24 m




Fusion M 4

Fusion M 4

The Fusion M 4 is designed for the small to mid-sized cruiser looking for Fusion M performance in a rugged, reliable sail. In this size range, lower loads allow for the use of polyester versus a more costly high-modulus fiber (carbon, aramid, etc). This sail delivers with the proven performance and durability of polyester fibers paired with easy-to-trim designs.

Boat Size

24-50 ft
7-15 m


All Polyester


Quantum iQ Technology®

Aero Structural Coupling


Sail Shape: Using our own 3D design program, actual boat specifications and our extensive database of boat and sail types, the size and geometry of the sail are defined and a mold shape created. Sophisticated editing tools allow for the highest levels of accuracy and refinement.

Aerodynamic Analysis: Using a virtual prototype of the sail shape and computational fluid dynamic (CFD) calculations, designers compute and visualize aerodynamic forces, wind angles and velocities, and the distribution of air pressure on each side of the sail. The resulting images and data help predict performance.

Structural Analysis and Fiber Mapping: Using finite element analysis (FEA), Quantum designers visualize where the sail bends and twists and the distribution of stress and strain within the membrane. The virtual sail is attached to a rig model that takes into account the properties of the running and standing rigging and longitudinal and transverse stiffness. Data gained through in-house materials testing is added to the equation to evaluate the effects of different fiber types, amounts, and placement leading to the development of a custom fiber map.

The integration of 3D modeling, CFD and FEA (Fluid Structures Interaction) allows designers to assess and refine varying elements of the sail design leading ultimately to the optimal size, shape, structure, fiber type, and fiber layout of the finished product. Quantum’s expertise in using these tools is particularly valuable when applied to large sailing yachts, which present unique challenges due to variable weight placement and heavy loads.


To create the laminate, fibers are strung on the base film in a custom pattern according to the design specifications. During application, excess glue is stripped from the fibers to avoid saturation, minimize brittleness, and to achieve the highest strength to weight ratio. After the top layer of film is in place, a vacuum bagging process is used to “shrink wrap” the film around the fibers. The layers are then fused using infrared heat. Quantum’s carbon infrared emitter system is a quick and efficient heat source that is easily controllable to ensure that just the right amount of heat is applied during the laminating process depending upon the type and amount of materials being used in your sail. To fabricate modern composites, infrared heat or UV radiation is used because they quickly and homogeneously heat or cure them. It also transfers heat directly and precisely without having to contact the laminate and damage the components, and can be used in the vacuum conditions Quantum uses during lamination.

Intense Pressure

Quantum uses two-part, thermo-set adhesives, which require high heat and pressure for lamination compared to simple thermo-molded adhesives. Several tons of pressure are applied to the vacuum-bagged laminate to ensure the adhesive is evenly spread. This proprietary process squeezes the adhesive down to the thinnest possible layer and ensures the highest possible adhesive to fiber ratio.

Cross-Linked Molecular Structure

The thermo-set adhesives used in Fusion M® sails undergo a transformation at the molecular level during lamination. The high heat and intense pressure induce polymerization—the creation of a cross linked molecular structure as the two part adhesive “kicks.” The result is a laminate with 4-5 times the sheer strength of a traditional hot-melt (thermo-molded) method.

Post-Cured Shaping

Unlike single-step lamination and shaping methods used by other sailmakers, sections of a Quantum Fusion M® sail are completely cured before the shaping process begins. This process eliminates the effects of shrinkage and distortion under the heat of the lamination process and guarantees repeatability. The carefully optimized aerodynamic shape of a Quantum® sail is reliably provided to each and every client, every time.

Sail Construction Details

When it comes to sail quality, small details make a big difference. Excellence and attention to detail are hallmarks of every Quantum® sail and ensure reliable performance. Click on photos for more information.

Headsail Clew

Our oversized, tear-drop-shaped corner patches minimize stretch and improve durability. The leech cord is contained in a separate protective pocket with multipart purchase for ease of adjustment.

Furling Headsail Clew

High-strength, non-corrosive stainless rings with Spectra chafe guard are anchored with webbings. This furling headsail features webbings and a protective pouch for the leech cord wrapped in Sunbrella® fabric to prevent UV damage—a feature which provides ultimate durability.

Furling Headsail Tack

Extended patching on the tack adds strength for partial furling. Roll-to reference marks ensure repeatable settings. Tack webbings replace standard rings to allow for easier furling. A foot cord prevents flutter.

Telltale Window

Telltale window and multiple sets of telltales aid trim and steering. The tapered foam luff on furling headsails provides luff tension for better sail shape when partially furled.

Furling Mainsail Clew

The oversized clew block provides maximum strength and minimum outhaul friction for in-mast furling. The leech cord lead around the clew and along the foot optimizes access for easy adjustment (can be installed to go all the way to the tack). The UV cover protects the furled sail from harmful sunrays; even the clew block webbings are completely covered to ensure long-term reliability and guard against sun damage.

Mainsail Head Details

Quantum’s cruising mainsails feature an aluminum headboard fitted with webbing and reinforced stainless steel rings (not rivets) for strength, smoothness, weight savings and durability. The luff hardware, with double luff tapes and extensive “quilting” throughout the head section provide strong, reliable attachment in one of the most highly-loaded areas of the sail.

Mainsail Batten Pockets

The batten receptacle and slide are attached to the inboard end of a full-length batten pocket with a stainless steel universal joint to insure easy hoisting and lowering while minimizing pocket maintenance. Double luff tapes and oversized reinforcement under the receptacle provide ultimate strength and reliability.

Overhead Leech Cord

The leech cord, rigged over the head and down the luff, allows for easy access at the tack.

Mainsail Tack

The mainsail tack features a webbed-in, stainless ring for simple, elegant attachment and a standard cunningham and foot cord (on loose-footed mainsails).

Mainsail Luff Reef

The luff reef features stainless steel rings. Extended webbings and a webbing handle make it easier to pull down and secure a reef tack.

Mainsail Leech Reef

Our mainsails feature oversized, multi-layer reef patches with quilted stitching for maximum strength and a smooth, flat, sail shape when reefed. The stainless steel rings, reinforced with webbing, provide reliable service for the long haul. Separate aluminum leech-cord cleat with hand stitching.

Mainsail Full Batten Details

Batten inboard fittings, with webbed-on slides, prevent battens from pushing into the mast, reducing chafe and wear. Open-pocket architecture ensures proper batten fit and allows removal of a broken batten.
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