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ROGER PIHLAJA



Shortening Sail

2025-08-07; 18:28:22 EDT

Member Since

2002-08-01

Posts: 1418

Hi Paul,

I recognized the GBI OEM roller furler was a piece of junk as soon as I used it.  One of the 1st upgrades I made to the boat was a Harken Unit 0 roller furler.  This system has an aerodynamic luff foil with dual slots and independent upper and lower swivels.  The furling spool is enclosed to completely capture the furling control line, thus virtually eliminating control line snarls.  There are Torlon ball, roller, or needle bearings throughout.  The thing spins as friction free as a bicycle wheel!  But, taking full advantage of this advanced roller furler requires a special sail.  I had a 150% genoa built for the boat.  The sail is constructed of Bainbridge CRUISE-LAM (tm) sailcloth.  CRUISE-LAM (tm) sailcloth is a 5 layer composite.  The outer layers are Dacron for UV, chafe, and fatigue resistance.  Under the Dacron layer, there is a Kevlar scrim layer (think coarse window screen), a Mylar film core, another Kevlar scrim layer, and then the other outer Dacron layer.  The construction is Bi-Radial to take advantage of the sailcloth's superior mechanical properties.  To fully utilize the independent upper and lower swivels, the leading edge of the sail has a foam luff pad.  A foam luff pad looks like ½ of a long skinny ellipse.  Sewn into the luff of a genoa, a foam luff pad causes the full draft midsection of the sail to be rolled up faster vs the foot and head sections of the sail, assuming the roller furler has independent upper and lower swivels which allow this to occur.  This allows the sail shape to be deep draft for light air and become progressively flatter as the sail is reefed.  This sail pulls like a freight train and keeps a beautiful sail shape until it's reefed down to about 100%.

Don't waste too much time or energy on your GBI furler.  Save your money and get a more modern system ASAP!

Roger Pihlaja
S/V Dynamic Equilibrium
1976  Sanford, MI
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