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Straight Luff Furlers also known as Bottom-up Furlers are Continuous Line Furling Systems that have have developed to make reaching sails such as the Code Zero much easier to handle. Although relatively deep and lightweight compared with a genoa, a certain degree of luff tension is still required to enable pointing, hence the term straight luff furler.
The torsional cable is enclosed in a pocket which runs up the luff of the sail.
The Tack is lashed to the bottom thimble eye in the torsional cable.
The Head is also lashed to the thimble eye of the torsional cable at the head.
The sail is stowed with the cable threaded through the luff pocket and firmly furled
Attach the bottom thimble eye to the fork on the top of the drum and fix the top thimble eye to the fork on the swivel at the head
Hoist the complete system as a tightly furled unit and tighten the luff by hauling on the halyard to achieve the required tension
Spin the wheel to unfurl by pulling on the appropriate part of the continuous furling line
Spinning the wheel in the opposite direction by pulling on the other part of the continuous furling line results in the bottom of the sail wrapping around the torsional cable first and then the roll gradually rises up the luff – Hence the term bottom up
Straight luff reaching sails
Torsional cable runs through a luff pocket sewn into the sail
Head and Tack attached to either end of the torsional cable
Furling begins at the tack and works its way up the luff to the head
High Working Load Capability to achieve the required luff tension.
Cable stiffness
Minimum diameter to reduce upwind drag
Good Initial Anti Torsional Performance – after a few turns the increased diameter of the rolled sail will help to transfer the torque up the cable and adds to the effective torsion of the system with each successive roll.
PBO is the stiffest, lightest and smallest diameter soft composite fibre available on the market
Zylon® PBO: Facts and Figures
The Jimmy Green Rigging Team can guide you through a choice of systems from top manufacturers in the field - Profurl, Karver, Selden and Harken
Set sail with the benefit of Team Jimmy Green expertise. We are confident that you will look forward to our emails.
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Jimmy Green Marine
The Meadows
Beer
Seaton
Devon
EX12 3ES
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