Quantum Sail Design Group

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    MC 8000

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    8000 Series

    • Description: These Grand Prix sails feature a blend
      of 50% Carbon 50% Vectran® to deliver superior control over heel and weather helm while maximizing upwind performance. For added durability, these sails feature taffeta on both sides.
    • Boat Size: 60'+
    • Construction: Membrane
    • Material/Fiber: 50% Carbon, 50% Vectran with Mylar® film and taffeta exterior on one or both sides.
    • Sail Color: Black & gold fibers with protective outer layers of white taffeta
    • Strength/Weight Ratio:starstarstarstarstar
    • Ease of Trim: starstarstarstarstar
    • Control of Heel:starstarstarstarstar
    • Upwind Performance:starstarstarstarstar
    • Wind Range Versatility:starstarstarstar
    • UV Resistance:starstarstarstar
    • Reefing:starstarstarstar
    • Furing:starstarstarstar
    • Durability:starstarstarstar
    • Optimal Shape Retenation: starstarstarstarstar
    • Cost:starstarstarstarstar
    • Sails in Series:
      MC8500
      Boat Length: 60+
      Fiber: 50% Carbon/50% Vectran
         
    MR 6000

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    6000 Series

    • Description: The sails in this series feature all Technora® fiber or a Technora®/Carbon blend. The fiber composition is driven primarily by boat size. In all cases, what you get is a lightweight Fusion M® sail with superior, all-around performance in a range of wind conditions. Versatility is key, with excellent ease of trim, reefing, furling, and durability. For added durability, these sails feature taffeta on both sides.
    • Boat Size: 30'-100'
    • Construction: Membrane
    • Material/Fiber: 70% Carbon, 30% Technora with Mylar® film and taffeta exterior on one or both sides.
    • Sail Color: All black fibers with protective outer layers of white taffeta
    • Strength/Weight Ratio:starstarstarstarstar
    • Ease of Trim: starstarstarstarstar
    • Control of Heel:starstarstarstarstar
    • Upwind Performance:starstarstarstarstar
    • Wind Range Versatility:starstarstarstar
    • UV Resistance:starstarstarstar
    • Reefing:starstarstarstar
    • Furing:starstarstarstar
    • Durability:starstarstarstar
    • Optimal Shape Retenation: starstarstarstarstar
    • Cost:starstarstarstarstar
    • Sails in Series:
      MC 6700

      Boat Length: 60' - 100'
      Fiber 70% Carbon/30% Technora®

      MC 6500
      Boat Length: 40' - 70'
      Fiber: 50% Carbon/50% Technora®

      MC 6000
      Boat Length: 30' - 60'
      Fiber: 100% Technora®
         
    MC 4000

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    4000 Series

    • Description: Designed for small to mid-size cruisers, the 4000 combines the rugged, reliable perfomance of polyester fiber with state-of-the-art Fusion M® construction. For added durability, these sails feature taffeta on both sides.
    • Boat Size: 25'-45'
    • Construction: Membrane
    • Material/Fiber: 100% Polyester fiber with Mylar® film and taffeta exterior on one or both sides.
    • Sail Color: All black fibers with protective outer layers of white taffeta
    • Strength/Weight Ratio:starstar
    • Ease of Trim: starstarstarstar
    • Control of Heel:starstar
    • Upwind Performance:starstar
    • Wind Range Versatility:starstarstar
    • UV Resistance:starstarstar
    • Reefing:starstarstar
    • Furing:starstarstar
    • Durability:starstarstar
    • Optimal Shape Retenation: starstarstar
    • Cost:starstarstar
    • Sails in Serites:
      MC 4000
      Boat Length: 25' - 45'
      Fiber: 100% Polyester
         
    CW 2000

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    CW 2000

    • Description: Cross-cut sail made with only
      the highest quality goods. Tight weave and excellent stretch resistance for exceptional shape-holding.
    • Boat Size: 50' and under
    • Construction: Crosscut
    • Material/Fiber: Woven polyester
    • Sail Color: White
    • Strength/Weight Ratio:star
    • Ease of Trim: starstarstar
    • Control of Heel:starstar
    • Upwind Performance:starstarstar
    • UV Resistance:starstar
    • Reefing:starstar
    • Furing:starstar
    • Durability:starstarstarstarstar
    • Cost:starstar
         

 

 

 

 


[DOWNLOAD THIS SUPPORT ARTICLE]

 

 

Mainsail Handling Systems: In-Boom Furling

by Dave Flynn, Quantum Atlantic

 

As mainsails get larger, the struggle to raise, lower, reef, flake, and cover them becomes more and more of a battle. Attempts to tame the beast have gone on since man first began to sail. Up until recently, these efforts have focused on breaking sail area down into smaller sizes to keep it manageable. This is one of the key factors behind “split rigs,” like the classic ketch, yawl, and cutter configurations, dominating larger cruising boat design. The last two decades have witnessed a revolution in sail handling systems. Roller furling systems for headsails are now standard equipment on virtually every cruising boat (less than 20% used them in 1980. These systems have been adapted to furl mainsails as well, by putting them inside the mast. While functional from a handling standpoint, In-Mast furling systems limit sail performance, primarily since the sails can’t take advantage of the structural benefits of battens. No longer does the modern cruising sailor have to accept this compromise. In-Boom furling systems not only furl the sail, but they allow the mainsail to be built with no concessions to size, shape, or performance.

 

Unfortunately, the reputation of In-Boom suffered from early attempts. The Stow boom worked reasonably well under ideal conditions on smaller boats, but was plagued with mechanical and reliability issues. Today, several respected manufacturers build In-Boom systems that work, including Schaeffer, Profurl, and Leisure Furl. Insuring that the system furls properly, and to guarantee reliability, puts special demands on sail design, engineering, and construction. More often than not, a problem with “the system,” is really a problem with the sail. Quantum has focused considerable resources and energy on solving the engineering and design problems involved, and has had the advantage of working with the systems since the earliest iterations.


Today, based on extensive experience, Quantum has developed special expertise in the design and construction of these special sails, including the recent completion of the largest ever built (Frers 140’)

 

HOW THEY WORK
Modern In-Boom systems are not just headsail furling systems which have been adapted; they are designed from the ground up for the job. They are made up of a rigid mandril set inside a hollow boom. The foot of the sail is attached along a portion of the mandril, and tack and clew are secured at either end.


The mandrill is driven by a powerful drum.  The line control for the drum is typically led aft on the deck alongside the mainsail halyard.  A single electric winch is usually used for the mandril control line and the halyard (the halyard on the hoist, the control line when furling).  Both control lines are run through sheet stoppers. 

 

 

 

A special feeder guides the luff of the sail into a sail track attached to the aft face of the mast. 

 

 

 

To hoist, ease the control line and raise the halyard. To lower, ease the halyard and wind in the control line. The critical issue is keeping the luff aligned underneath the feeder as the sail is raised and lowered.

 

 

 

THE SAIL
The beauty of In-Boom furling is not just in the never leave the cockpit ease of handling, but in the sail itself. A full batten structure is used which allows the designer to create a full-sized sail, with as much roach (area outside the straight line between head and clew), as the sail needs. Sail shape, while it must be tailored to the demands of the system, is as good as a conventional sail. Shape can be controlled with mastbend and by partially furling the sail.



In-Boom furling also allows for infinite reefing, with a wonderfully flat, smooth shape.


 

 



THE DEVIL IS IN THE DETAILS
Construction of a sail to fit an in-boom furling system demands special engineering. Batten pocket angles, corner patch assembly, plying to maintain uniform roll tension, luff tape, headboard, tack and clew fittings, batten pockets; in short, almost every detail must be specially adapted to the individual furling system. The most common problem with in-boom systems is not the system itself, but the sail. Not only is it critical that the sail’s geometry is perfect, it is also essential that nothing move initially or over time. This is why composite construction, with its lower rate of stretch, is often used (particularly as the sail size increases).

 

 


Frers 140’ custom; the world’s largest in-boom furling mainsail.

 


 

 

 
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