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Old 21-02-2011, 03:26   #1
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Clutch or Jammer for Pole Uphaul and Downhaul

40' cruising yacht - I don't press hard under spinnaker; I'm not racing.
Pole has 8mm uphaul and downhaul lines - I plan to install some clutches/jammers. What sort of load bearing SWL do these need? Options include:
Lewmar D1 6-8mm 300kg - $120
Spinlock XAS 4-8mm - 450kg - $130
Lewmar D2 8-10mm 500kg - $170
Spinlock PXR camcleat - 8-10mm 200kg - $100
Spinlock Rope Jammer - 6-10mm 400kg - $90

Recommendations most welcome!

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Old 21-02-2011, 07:28   #2
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Re: Clutch or Jammer for pole uphaul and downhaul

Unless using the type that will positively release under load--which are quite costly--you do not want clutches on any line that has to be released quickly and easily in an emergency as might pole guys and lifts. Beneteau's original equipment for such applications is generally jam cleats and you might find that BeneteauUSA can provide the items you need at subtantially less cost than any other supplier (e.r. our Lewmar sheet-lead cars were >$100 less, each, through Benetesu then they were at Defender or any of the marine hardware suppliers).


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Old 21-02-2011, 07:37   #3
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Re: Clutch or Jammer for Pole Uphaul and Downhaul

This page on harken's web site might help you find strength ranges.
Harken Spinnaker Systems

Generally the pole's topping lift only holds up the weight of the pole.

The downhaul/foreguy can carry a LOT of load. But releasing the downhaul while loaded is almost never done on the boats I race on. Release the sheet ( or maybe guy ) as appropriate to reduce load on the sail.
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Old 27-02-2011, 13:31   #4
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Re: Clutch or Jammer for Pole Uphaul and Downhaul

Uphaul: Clutch
Downhaul: Cam cleat

Ideally, 2 cam cleats, one either side of the cabin top, with the downhaul running through a turning block on the pole, which (a) gives you a double purchase, reducing strength required to pull downhaul on, and (b) allows you to work the downhaul in conjunction with the brace (a.k.a. "guy") from the high side on both jibes

On our 40' cruiser racer, we use 8mm spectra for the uphaul, in a garhauer clutch. Our downhaul is 8mm double braid, in standard cam cleats. We could probably get away with 6mm for both from a load point of view, but 6mm is hard on the hands.
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