Isofurl Main Page

Isofurl # 8
Rod Measurements: 11/16" (fore & aft) x 13/16" (side to side)
Equivalent Wire Size: 7mm (9/32")
Luff Tape: #6 (3/16")

Isofurl # 10
Rod Measurements: 7/8" (fore & aft) x 15/16" (side to side)
Equivalent Wire Size: 10mm (3/8")
Luff Tape: #6 (3/16")

Sailmakers, See Isofurl Sailmaker Instructions

Isofurl
Luff Rod Profile

The Isofurl is a solid-rod type Jib furling system, with Twin Luff Grooves. This system replaces the Headstay and has no stay inside the furling rod. Produced by Isomat, the French Sparbuilder, it was assembled full length and shipped with the mast as part of a 'package' sold to many Boatbuilders. The solid rod Isofurl system came in 2 different rod sizes. To determine which size you have, you will have to measure the rod.

Most Isofurl systems came with a "Halyard Hoist Locking Car", to which the head of the sail was attached. This car is hoisted by a special hook with a long messenger line attached to it. The halyard is attached to the top of the hook NOT to the locking car. When the car is hoisted to the top of the system, it locks in place, and the halyard (with hook still attached) is pulled down with a messenger line.
The halyard should never be attached directly to the locking car assembly!
The car is 'unlocked' (to bring the sail down), by means of a special trip wire sewn into the luff of the sail. - Be sure to attach the trip wire to the cars' locking lever BEFORE hoisting!!

Some Isofurl systems came with a conventional-type Halyard Swivel, to which the halyard stayed attached after hoisting. This Halyard Swivel was also used as a retrofit by those who preferred the more conventional arrangement. In rare cases where the 'locking lip' at the top of the system has worn, or broken off, the halyard locking car will no longer lock. The Halyard Swivel is an effective cure for this problem as well, and installs easily in minutes.

For System Details, See: Isofurl System Diagrams

To remove any System Components, See: Isofurl Bearing Replacement

Sailmakers, See: Isofurl Sailmaker Instructions

COMMON ISOFURL PARTS
All parts are still available for Isofurl Systems. In all cases, for every part, you will have to provide the measurements specified. There are many parts for specific configurations that are not listed here. If you require Isofurl Components not listed here please contact us with details and specifications.
Upper Bearing Assembly w/ Eye This unit threads directly onto the Upper Rod End and contains the Bearings that allow the rod to rotate, as well as an Eye that connects the system to the Forestay Toggle. *Forestay Toggles are required for use with all Furling Systems.* When reattaching the Upper Bearing Assembly to the Rod End new Teflon thread tape (a standard plumbing item) should be used on the screw threads to help prevent water intrusion.
Isofurl Upper Bearing & Eye Ass'y for 10mm Pin: Isofurl UBE-10-___: Isofurl Upper Bearing & Eye Ass'y for 12mm Pin: Isofurl UBE-12-___: Isofurl Upper Bearing & Eye Ass'y for 14mm Pin: Isofurl UBE-14-___: Isofurl Upper Bearing & Eye Ass'y for 16mm Pin: Isofurl UBE-16-___: Isofurl Upper Bearing & Eye Ass'y for 20mm Pin: Isofurl UBE-20-___: Isofurl Upper Bearing & Eye Ass'y for 1/2" Pin: Isofurl UBE-1/2-___: Isofurl Upper Bearing & Eye Ass'y for 5/8" Pin: Isofurl UBE-5/8-___: To order, specify Pin size and the length of the Assembly from the bottom of the unit to the center of the clevis Pin hole.
Bearing Replacement Kits Isofurl systems have a set of 3 highly specialized torque bearings with special SS spacers and seals in an aluminum housing on each end of the rod. Bearing Replacement Kits contain all the bearings and seals necessary to rebuild Both ends of the System. Special tools are required, as bearings are press-fit. However, if your Bearings require replacement, we recommend that you Replace the Upper and/or Lower Ends (Upper Bearing Ass'y, above, and Lower Bearing Ass'y, below). See: Isofurl Bearing Replacement. Isofurl #8 Bearing Replacement Kit: Isofurl 8-BK: Isofurl #10 Bearing Replacement Kit: Isofurl 10-BK: Bearing Replacement Kits contain all the bearings and seals necessary to rebuild Both ends of the System (Special SS Bearing Spacers last indefinitely, your existing ones are reused). Kits include all components necessary to replace *Bearings and Seals in Both* Ends of the System. Bearing Replacement Kits are recommended for use by Professionals only, Special tools are required, as bearings are press-fit. If this service is not available locally, we will install them for a small additional charge - send us one or both aluminum housings as unscrewed directly from the rod ends. See: Isofurl Bearing Replacement.
Halyard Hoist Locking Car Assembly Available in two sizes to fit the two different size rods. Halyard Hoist Hook, *Isofurl 810-H*, is included with all Locking Cars. A Heavy-duty version is available with contoured SS straps between the pivot pin and the Head shackle, Heavy-duty shackle is included. Isofurl #8 Halyard Hoist Locking Car: Isofurl 8-HLC: Isofurl #8 Heavy-duty Halyard Hoist Locking Car: Isofurl 8-HLC-HD: Isofurl #10 Halyard Hoist Locking Car: Isofurl 10-HLC: Isofurl #10 Heavy-duty Halyard Hoist Locking Car: Isofurl 10-HLCHD:
	Halyard Hoist Hook Special SS Hook for use with all Isofurl Systems using a Halyard Hoist Locking Car. Hook is included with all Halyard Hoist Locking Cars. Isofurl Halyard Hoist Hook: Isofurl 810-H:
Halyard Swivel Though not commonly supplied with most Isofurl systems, a conventional-type Halyard Swivel is sometimes used to replace the Halyard Hoist Locking Car. When using a Halyard Swivel, the halyard stays attached after hoisting the sail, as in conventional furling systems. Available in two sizes to fit the two different size rods. Isofurl #8 Halyard Swivel: Isofurl 8-HS: Isofurl #10 Halyard Swivel: Isofurl 10-HS:
Drum Assembly Two-piece drum assemblies (and drum halves) are available in 3 different diameters. All sizes fit all Isofurl Systems, but only work with one size Stainless Steel Lineguard. If you are changing Drum sizes, you will also need to change Lineguards. To order a replacement Drum, you must know your existing Drum diameter. Isofurl Plastic Drum Assembly - 6 1/4" (160mm) Maximum Diameter: Isofurl DA-1: Isofurl Plastic Drum Half - 6 1/4" (160mm) Maximum Diameter: Isofurl DA-1B: Isofurl Plastic Drum Assembly - 6 13/16" (175mm) Maximum Diameter: Isofurl DA-2: Isofurl Plastic Drum Half - 6 13/16" (175mm) Maximum Diameter: Isofurl DA-2B: Isofurl Aluminum Drum Assembly - 9 3/8" (238mm) Maximum Diameter: Isofurl DA-3A: Isofurl Aluminum Drum Half - 9 3/8" (238mm) Maximum Diameter: Isofurl DA-3AB:
Stainless Steel Lineguard Assembly Lineguards are available for 3 different drum diameters. All sizes fit all Isofurl Systems, but only work with one size Drum Assembly. To order a replacement Lineguard, you must know your existing Drum diameter. Isofurl SS Lineguard for 6 1/4" (160mm) Maximum Diameter Drum: Isofurl LG-1: Isofurl SS Lineguard for 6 13/16" (175mm) Maximum Diameter Drum: Isofurl LG-2: Isofurl SS Lineguard for 9 3/8" (238mm) Maximum Diameter Drum: Isofurl LG-3:
Lower Assembly Complete w/ Adjusting Screw & Toggle Complete Lower End Assembly threads directly onto the Lower Rod End and contains everything from there down to the lower Clevis Pin that attaches the System to the deck. It includes: 1) the Lower Bearing Assembly, 2) the Adjustment Screw Socket, and 3) the Adjusting Screw with Toggle. When reattaching the Lower Assembly to the Rod End, new Teflon thread tape (a standard plumbing item) should be used on the screw threads to help prevent water intrusion. Isofurl Lower Assembly Complete w/ Toggle: Isofurl LAC-___: To order, specify: 1) Thread size (metric). 2) Pin diameter. 3) Length of Stainless Steel shaft protruding from the bottom of the unit with adjustment screw Removed.
	Lower Bearing Assembly Lower Bearing Assembly contains the Bearings that allow the rod to rotate, as well as the toggling assembly that the lineguard clamps to. It threads directly onto the Lower Rod End and onto the Adjustment Screw Socket for the Adjusting Screw with Toggle that attaches to the deck. Unit is 5 1/16" (130mm) long. When reattaching the Lower Bearing Assembly to the Rod End or the Adjustment Screw Socket, new Teflon thread tape (a standard plumbing item) should be used on the screw threads to help prevent water intrusion. Isofurl #8 Lower Bearing Assembly: Isofurl LBA-8: Isofurl #10 Lower Bearing Assembly: Isofurl LBA-10:
	Adjustment Screw Socket Adjustment Screw Socket threads directly onto the Lower (bearing end) End of the Lower Bearing Assembly. The Adjusting Screw with Toggle threads into it. When reattaching the Adjustment Screw Socket to the Lower Bearing Assembly, new Teflon thread tape (a standard plumbing item) should be used on the screw threads to help prevent water intrusion. Isofurl Adjustment Screw Socket - 10mm: Isofurl LSS-10-___: Isofurl Adjustment Screw Socket - 12mm: Isofurl LSS-12-___: Isofurl Adjustment Screw Socket - 14mm: Isofurl LSS-14-___: Isofurl Adjustment Screw Socket - 16mm: Isofurl LSS-16-___: Isofurl Adjustment Screw Socket - 20mm: Isofurl LSS-20-___: To order, specify: 1) Thread size (metric). 2) Length of Stainless Steel shaft protruding from the bottom of the unit.
	Adjusting Screw w/ Toggle Available in a number of configurations and sizes with an integral toggle, or as an eye with a removable toggle. Set screws (2 sizes) are included. Isofurl Lower Screw w/ Toggle: Isofurl LST-___: To order, specify: 1) Thread size (metric). 2) Pin diameter. 3) Threaded length.

Spars, Rigging, and Hardware for Sailboats