Racing Upwind Sails

Tri-Radial Sails

Tri-radial Sail Construction

Tri-radial sails utilize panels of pre-made materials radiating from the three corners of the sail. The long, or “warp” fibers of the material are oriented to align with the primary load paths. Better alignment results in lower stretch improving shape holding. Tri-radials provide a performance upgrade for those who are looking for more than what a classic woven polyester sail can provide.

Designed for Maximum Control

When it comes to boat handling and speed, it’s sail shape that makes the difference. To achieve the ideal shape, Quantum’s sail designers use proprietary computational tools, part of the iQ Technology® suite, to create custom shaping, tailored on a sail-by-sail basis to expected usage and boat-specific constraints such as mast bend, displacement, and righting moment. Sail shapes feature a smooth, flat aerodynamic profile for optimum upwind performance, with an open trailing edge to reduce heeling and weather helm.

The Right Materials

There is a broad spectrum of material options ranging from simple woven materials, to custom composites and they are available from a variety of suppliers. In general, there are three categories:

  • Woven Radial: Woven polyester specially designed with strength in the long (warp) direction so they can be used in tri-radial panel configuration. Compared to cross-cut woven polyester, this material offers 10 to 20% less stretch due to the material and the efficiency of the panel layout. Works well on boats up to 30’.

  • Polyester Composites: Layered construction featuring large, straight, untwisted polyester yarns (scrim) sandwiched between two layers of polyester film. They can use exterior skins of woven polyester taffetas on one or both sides for additional durability. The fiber network does the work of resisting stretch, augmented by a layer of polyester film for balance, while the woven taffetas provide rugged protection against, UV, tear, and chafe. Compared to cross-cut woven polyester, these materials offer as much as 40 to 50% better stretch resistance. Ideal for boats up to 40’

  • High Modulus Composites: Identical to polyester composites except the fiber network consist of high-modulus fibers like Spectra®, carbon, or aramid, with the dramatically reduced stretch these fibers provide. Depending on fiber type and compared to cross-cut woven polyester, these materials offer four to five times better stretch resistance. Ideal for larger boats up to 80’.

Racing Tri-radial TR 1800

Racing Tri-radial TR 1800

Series 1800 utilizes tri-radial construction with pre-made high modulus composite materials featuring carbon, aramid and Spectra® fiber networks. There is a wide variety of material options available in this series. Boat size and expected usage will dictate material choice.

Boat Size

40' - 80'


High modulus composites with carbon/aramid blends and taffeta exterior skins


Racing Tri-radial TR 1600

Racing Tri-radial TR 1600

Series 1600 utilizes tri-radial construction with pre-made polyester composite materials. Large, unwoven polyester fibers (scrim) are sandwiched between exterior layers of woven polyester (taffeta). A polyester film provides off threadline (bias) stability.

Boat Size

40' and under


Polyester composites with taffeta exterior skins


Racing Tri-radial TR 1200

Racing Tri-radial TR 1200

Series 1200 utilizes tri-radial construction with special warp-oriented woven polyester materials. Radial woven materials can be oriented to better align with sail loadings than in a traditional cross-cut configuration, providing a modest increase in ability to resist stretch with the proven reliability of woven construction.

Boat Size

30' and under


Warp-oriented radial woven polyester


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.

Mainsail Clew

Quantum’s racing mainsails feature a lightweight stainless steel ring in the clew with multiple webbings, Velcro® clew strap and extensive “quilting” for smooth, clean handling of the sail’s most highly loaded corner.

Leech Cord Detail

The leech cord with sewn aluminum cleat and shock cord take-up system provides smooth, simple adjustment.

Mainsail Tack

The mainsail tack features a lightweight, webbed-in stainless steel ring, webbed cunningham, foot cord and overhead leech cord for easy access and adjustment.

Mainsail Batten Pockets

The batten receptacle and Teflon®-reinforced luff tape at the inboard end of full length battens ensure smooth batten-to-mast connection and reduce friction and wear over time.

Mainsail Leech Reef

Racing mainsail leech reefs feature lightweight Spectra webbing and separate leech cord access supported by heavily quilted Dacron® patching to smooth the transition into the body of the sail.

Mainsail Luff Reef

Racing mainsail luff reefs feature lightweight webbed-in stainless steel ring anchored in layers of heavily quilted Dacron® to ensure smooth transition into the body of the sail.

Mainsail Leech Battens

Mainsail leech batten with RBS rocket tensioner provides easy adjustment and a smooth, low profile cover to prevent batten from hanging up on the backstay.

Mainsail Head Details

Quantum’s racing mainsails feature a lightweight, aluminum headboard with overhead leech line for easy access and ease of adjustment. Quilted, extra-stiff Dacron layers provide smooth transition of loadings into the body of the sail.
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