12:1 GP catamaran mainsheet system
12:1 GP catamaran mainsheet system

12:1 GP catamaran mainsheet system

Regular price $2,099.90 Sale price $2,200.00

We have a limited stock of these fantastic 12:1 systems that work brilliantly with our Goodall Design 8mm red mainsheet. No twisting no tapering just perfect.


The "with sheet" option has the mainsheet threaded through the block.

Harken’s Grand-Prix mainsheet systems are critically important options for high-performance beachcats. The high-efficiency blocks making up these systems feature insert-molded ceramic bearings that almost eliminate rolling resistance, greatly improving power transfer to the crew for easy, precise trimming. These compact blocks feature hardcoat-anodized side plates that envelop composite sheaves for easy disassembly/reassembly. The system profile is the lowest on the market by far. High-performance fairing increases aerodynamic flow and protects the crew and blocks from impact damage. The lower block features a built-in cam arm that infinitely adjusts by loosening two (2) screws with a hex key. A single ratchet sheave in the bottom block ensures release is controlled and smooth. A snap shackle attaches the block to the boom. A swivel shackle attaches to the traveler.

Note: the GP mainsheet system is delivered as a 12:1 mainsheet system, but can be easily reconfigured as a 10:1 or an 11:1 to align with wind or crew preference. All necessary parts and reeving instructions are included.

Standard options does not include sheet.

Sheet included is our 8mm SuperLight. Though testing, this has shown to be better than other sheets, including tapered lines.

Sheave Ø 59 mm
Pin-to-pin length 224 mm
Weight 1039 g
Maximum line Ø 8 mm
Maximum working load 545 kg
Breaking load 1636 kg

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