Cruising 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 creates 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 sailing enjoyment, it’s sail shape that makes the difference. Sail shapes are custom-designed for your boat by Quantum’s experienced sail designers based on 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 shape allows sailing into a higher range of wind conditions before reefing becomes necessary.

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 four 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 40’.

  • Spectra® Reinforced Woven Radial: Radial woven materials, reinforced with Spectra® or other high-modulus fibers, provide additional strength and durability under high loads. They offer similar performance to woven radial material with the added benefit of better performance under high loads, making them useful in boats up to 60’.

  • Polyester Composites: Composite construction featuring large, straight, untwisted polyester yarns (scrim) sandwiched between two layers of woven polyester taffetas. 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 55’

  • 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 feet.


Cruising Tri-radial TR 2800

Cruising Tri-radial TR 2800

Series 2800 utilizes tri-radial construction with pre-made high modulus composite materials featuring carbon, aramid and Dyneema 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



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


Cruising Tri-radial TR 2600

Cruising Tri-radial TR 2600

Series 2600 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

55' and under


Polyester composites with taffeta exterior skins


Cruising Tri-radial TR 2200

Cruising Tri-radial TR 2200

Series 2200 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. There are several radial woven materials available depending on boat size and expected usage. For high-load applications there are also Spectra/Dyneema reinforced wovens (Hydranet).

Boat Size

45' and under


Warp-oriented woven radial polyester or Spectra® reinforced woven radial


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.

Overhead Leech Cord

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

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 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.

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 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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