Anatomy of a furler

Practical Boat Owner - - Practical -

The drum is cast in Scot­land, laser cut­ting is car­ried out by a nearby busi­ness and the alu­minium ex­tru­sions are bought in. Ev­ery­thing else is done in-house, from fi­nal ma­chin­ing of the drums and weld­ing to­gether all the sheet ma­te­rial through to ma­chin­ing the top swivel from solid 1¾in stain­less steel.

When you buy a furler Sailspar need to know your boat’s forestay length and di­am­e­ter, the fit­tings used at the mast and deck and the length of the run aft for the furl­ing line. They’ll then rec­om­mend one of their three furl­ing drum sizes and build you a furler to suit your boat, as­sem­bling it from its com­po­nent parts in their work­shop. Ev­ery­thing is trial-fit­ted be­fore ship­ping, so there shouldn’t be any prob­lems putting it to­gether.

In the pack­age comes the drum, pre-as­sem­bled with the ten­sion­ing bot­tle­screw, ball races, drum shield, di­verter sheaves, furl­ing line and dou­ble blocks to lead it aft. There’s also the top swivel, a ny­lon bush for the top of the foil, enough foil sec­tions to make the sys­tem, alu­minium joiner pieces and ny­lon bushes to sit within the foils. Fi­nally there’s a top-hat ar­range­ment which sits on top of the drum and cov­ers the bot­tle­screw, a hal­yard di­verter, all the screws you need for as­sem­bly and a new, over-length forestay with the correct top fit­ting swaged in place.

We re­ceived a 106-25-105 sys­tem, which means that it had a 106mm drum with 10.5m of 25mm foil sec­tions. Our forestay length is just over 9m, so that left us plenty to play with.

Com­po­nent parts in the work­shop

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