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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation > gybe preventers
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Thread: gybe preventers Reply to Thread
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Topic Review (Newest First)
04-08-2007 11:16 AM
Guesser I'm a bit lazy, so when I'm sailing downwind in in light air I just take the end of a jib sheet (or any handy line) and lash the boom to a stantion or cleat; this generally provides enough protection and keeps the main from floundering about. I also have a 4 to 1 preventer for use in heavier winds, but usually it's overkill and not worth the effort.

On a side note...I recently added a boom kicker and I gotta tell ya, it is the coolest thing ever.
04-08-2007 11:11 AM
sailingdog It depends. If you're using a snatch block forward, and the line is long enough, you can have it run aft to the cockpit and just slacken it when you need to gybe. This would avoid the need to leave the cockpit to adjust the preventers, but would leave two more long lines underfoot in the cockpit. If you're sailing with a jib and a spinnaker, now you've got eight lines sitting in the cockpit—not including the mainsheet or any traveler or track control lines.
04-08-2007 11:08 AM
pmoyer
Quote:
Originally Posted by sailingdog
IMHO, a boom brake is a better solution than the preventers, since it requires less user intervention once it is setup than do the preventers. It also has fewer dangers associated with it than do the preventers, which, in certain instances can cause the mainsail to backwind and "pin" the boat down, possibly leading to a capsize situation.
It seems like many of the preventer rigs also require someone to go forward to release the line at the snatch block in the forepeak, prior to any gybe....

No real expience - adjust confidence accordingly!

Cheers!
04-08-2007 10:06 AM
sailingdog A preventer is a line attached to the boom and some point forward on the boat. Its purpose is to prevent the boom from crossing the boat in an accidental gybe and hitting you in the head—hence the name, preventer. Usually, there is one on each side of the boat, and they have to be released and re-tensioned after each intentional gybe.

A boom brake, serves a similar purpose, to reduce the chance of injury from the boom in an accidental gybe, but as it is named, it works by slowing the movement of the boom, rather than preventing it altogether. It is usually a device—essentially a rope clutch of a sort, that is attached to the boom and has a line that is attached forward and outboard of the boom on either side that runs through it. By adjusting the tension of the rope and the clutch mechanism, you can control how much braking force is applied to the boom.

IMHO, a boom brake is a better solution than the preventers, since it requires less user intervention once it is setup than do the preventers. It also has fewer dangers associated with it than do the preventers, which, in certain instances can cause the mainsail to backwind and "pin" the boat down, possibly leading to a capsize situation.
04-08-2007 09:58 AM
stillanoob I know that this is a really obvious question to most but what exactly is a preventer and how does it work? Is it a couple ropes there to hold the boom back? or that boom brake? I am way off owning my first real boat, but am looking into getting a 16' Nacra or hobie cat so brushing up on the terms is prolly a good start
03-14-2007 02:47 AM
Valiente That will work fine in all but very heavy air cases, but I add the mechanical advantage in case of a situation that might crash gybe the boom, like weak winds but relatively high following seas, like from a front that's passed over but left a lot of slop behind. That sort of thing can roll the boat enough to turn the boom into a bam.

When sailing very broadly downwind, if I want to gybe/wear the boat smoothly, I'll use both rigged preventers instead of the mainsheet to transit the boom under some friction as I give a little nudge with my knees holding the tiller.

I've just found it's a nice way to handle things alone and I've transferred "the system" to the new, larger boat, although the boom is high enough that it's not half the hazard it was on the 33 footer...and I will have a pretty heavy traveller on the deck as opposed to the cabin top just aft of mid boom.
03-13-2007 01:31 PM
flomaster I use a simplified version of Valiente's preventer. I attach a snatch block forward of the mast on either side of the boat. I'll use my spare jib sheets, if I have nothing else, and tie one end to the boom, lead it through the snatch blocks, and then lead them aft to my two aft winches. That setup, and a whisker pole, makes for a pretty easy run sailing wing on wing.

The double headsail idea isn't too bad, either, if you have an extra halyard up front (you should have a spare, anyway). I just don't like unfurling the extra sail, only to have to stuff it back in the bag later.
02-23-2007 11:32 AM
fendertweed
Quote:
Originally Posted by chris_gee
No you dont tie either on. It just clips on the sheet you are using.
thanks, I hadn't looked at the pole in so long I'd forgotten what fitting was at the end.

Jon
02-22-2007 05:33 PM
chris_gee No you dont tie either on. It just clips on the sheet you are using.
02-22-2007 01:34 PM
fendertweed just to clarify on the whisker pole... do you tie both jib sheets through the end of the pole? Recommend type of knot?

Thanks,
Jon
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