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Old 01-01-2009, 07:54 PM   #15
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A reminder on the shoutbox came up--boom brakes and preventers are IMPORTANT to prevent injury.

Anyone recently put on a new boom brake or preventer system?
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Old 01-03-2009, 06:43 PM   #16
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Regarding the shoutbox comment:

"Boom brakes (and preventers) are good things. You can also change your main sheet setup to help prevent such things."

I'll try and find a pic or two of this, but there are two ways I know of that one can have a mainsheet set up to help prevent a wild swing across the cockpit. The use of a preventer or a boom brake aside...

The first is where, rather than allowing your mainsheet to ride along a traveler as many folks do which allows the equiv. of a single point attachment from the boat to the boom, you can have two blocks--one on each side of the traveler or one on each side of the boat that BOTH go up to blocks on a bail on your boom. Then, when tacking, you've got more work to do because one of these sheets is tight at all times--your boom cannot freely swing across the cockpit, you must manually release the lee one in the tack so the boom can cross over to the new lee side. Then, you reset the new lee side sheet to be tight so the boom cannot go wildly back across the cockpit unless you release the sheet. There's a pic in a book by Ross Norgrove (I think that's his name) on "Cruising Rigs and Rigging."

That set up works okay unless you're really on a run...in which case both sheets are so loose that the boom can come back across with an accidental gibe. That's when a preventer set up works wonderfully. Or, a boom brake helps.

If you don't want a boom brake or a preventer which can point load your boom depending on set up, you can set up a single mainsheet through a series of blocks to dampen the quick motion as well. Across the back of the cockpit, that's a block on port with line leading up to the boom then back down to a block in the mid-section which may be on a small traveler or horse (if traditional boat) then back up to a block on the boom then down to a block on the starboard side. With this set up, you might have a winch on one side or the other but don't need them both so you can actually couple it with running backstays nicely and use the lee side winch if needed. You can increase the "friction" of this as a boom brake by adding purchase to your block situation (with line up from port to boom, back down to port, up to boom, down to middle block, up to boom, down to starboard side, up to boom, down to starboard side...) and have a set up that is practically impossible to move. The larger the mainsail the more likely such a set up is desired OR a boom brake is wanted.

Clear as mud?
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Old 01-27-2009, 12:22 PM   #17
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I've added a Gyb'Sea boom brake to the boom end of my Gemini 34' catamaran. In the "weakest" setting, it still provides to much brake action in all but the very highest winds - where I have long since reefed anyway.

Has anyone used a smaller diameter line to reduce the effectiveness of the brake? I was thinking of trying an 8mm line.

I suppose I could move the brake to mid-boom - but it is so convenient on the boom end and reduces the stress on the boom that I'd rather keep it where it is installed. thank you
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Old 01-27-2009, 10:21 PM   #18
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Quote:
Originally Posted by captstu View Post
Gyb'Sea boom brake to the boom end of my Gemini 34' catamaran.
Hi ,

Have you got a picture of the brake and the setup? What placement instructions came with the model ?

Reducing line diameter will certainly reduce friction - but how much will also be effected by angles and the radius set by the boom - the answer will probably be found in trial and error.

Richard
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Old 01-28-2009, 12:48 AM   #19
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Thje photos of the setup are at:

http://shearwater-sailing.com/Gemini%20Res...Sail%20Plan.htm

I was hoping to avoid some trial and error by leaning on the experience of others. My guess is 8mm line will work. The vendor is not really any help - they (and Dutchman) don't recommend boom end installations - but given the layout that is typical of catamarans, boom end is a better bet - the loads are lighter and the control more fine -- except there is to much friction for the light load. Thank you
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Old 02-02-2009, 08:27 PM   #20
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Quote:
Originally Posted by captstu View Post
Thje photos of the setup are at:

http://shearwater-sailing.com/Gemini%20Res...Sail%20Plan.htm

I was hoping to avoid some trial and error by leaning on the experience of others. My guess is 8mm line will work. The vendor is not really any help - they (and Dutchman) don't recommend boom end installations - but given the layout that is typical of catamarans, boom end is a better bet - the loads are lighter and the control more fine -- except there is to much friction for the light load. Thank you
We've just installed a Gybe-easy mid boom - about 2 ft aft of the boom vang. In a following sea of about 15kts it works well on the lightest setting with the 8mm line. We like its small size and no real moving parts. Still experimenting with the line tension which seems to have more of an impact to its hold than the actual setting. Take your point about the layout and the boom end set up for cats. Is your gybe easy aft or forward of the mainsheet? The reason for a mid boom recommendation seems to be that the swing of the boom is arrested quicker and eases the fulcrum stress of a boom end installation. Try an experiment, in light wind grab the boom vang and swing the boom across. Then do the same swinging it over from the boom end. You'll notice a big difference in the force exerted on the rig. Even with all the best advice in the world, every set up is slightly different so trial and error is often unavoidable. Our onboard bread making is still more error and certainly a trial!

Fair winds,

Mico
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Old 02-02-2009, 08:40 PM   #21
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The Gub'Easy on the Shearwater, a '93 Gemini 3400, is installed on the very, very end of the boom - so the forces are lower while the distance traveled is greater. I plan on trying some 8mm line tomorrow and see if it performs more satisfactorily.
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Old 02-02-2009, 11:02 PM   #22
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Quote:
Originally Posted by captstu View Post
The Gub'Easy on the Shearwater, a '93 Gemini 3400, is installed on the very, very end of the boom - so the forces are lower while the distance traveled is greater. I plan on trying some 8mm line tomorrow and see if it performs more satisfactorily.
Hello Stuart,

If you go to a previous topic headed Boombrake: HERE, you will find a design made in stainless steel using the same criteria as is in the Gybe Easy from Wichard.

I have used the stainless brake with 14,12, 8mm line and even with 6mm braid - Successfully.

Here are a couple of pictures showing different line in different friction positions.

R_Ichard_Boom_Control_Brake1.jpg

R_Ichard_Boom_Control_Brake3.jpg

This one rigged with 6mm braid.

The only negative in using a brake on the boom-end on a catamaran is the extraordinary amount of line that is required. Whatever, the advantage of a brake compared to using a preventer from the point of safety and not having to release the preventer and retying it, should be considered for every sail boat's rigging setup.
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Old 02-03-2009, 02:30 PM   #23
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Here is how you get seriously injured even on a light air day while sailing...

http://www.break.com/index/sailor-knocked-...boom-swing.html
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Old 02-04-2009, 02:55 AM   #24
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Boom brakes are desirable things. I know this for two reasons (1) mine was stolen and (2) I've done ocean crossing with them and they earn their keep. However, I agree with JeanneP, I prefer to tack down-wind.
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Old 02-04-2009, 12:51 PM   #25
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I have boom head clearance in the cockpit. I once went forward to retrieve a loose piece of gear, was not paying attention to the main and had a glancing blow high on the forehead when the boom came across in an accidental jibe. Vowed never again to not set a preventer or not keep an eye on the boom when on a short downwind leg. I always cautiously watch the boom when I set the vang tackle to work as an outboard preventer.

Having clearance for crew in case of an uncontrolled jibe does not take into account the harmful shock to the rig when it happens in fresh conditions. I once jibed in about 25kts, while below making lunch. It pulled a forward lower chainplate and it's structural member to the hull up about an inch!
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Old 02-04-2009, 07:52 PM   #26
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Once jibed in about 25kts, while below making lunch. It pulled a forward lower chainplate and it's structural member to the hull up about an inch!
This is an occasion where the brake comes into its own - while a preventer may prevent injury to crew - it does not limit possible damage to standing rigging - especially when the boom end - ends up in the briny.
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Old 02-04-2009, 08:21 PM   #27
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I once went forward to retrieve a loose piece of gear, was not paying attention to the main and had a glancing blow high on the forehead when the boom came across in an accidental jibe.
I'm a total clutz on land. Put me on a boat and I'm entertaining to onlookers to watch--but well, dangerous due to my clutzyness. Unless winds are very light and we're sailing well forward of a beam reach...when I go forward and I'm adjacent to a boom on a smaller vessel (w/o preventer) I bend over the cabin trunk or even go forward "on all fours" if the boom is really low. My husband thinks its overkill, but having lived with me, he knows that I'm prone to tripping so its best for me to stay low anyway. On a larger vessel, I just force myself to bend over/hunch under the boom level while going forward which does the trick. Terribly cautious I am--but I know that I could get wacked so easily by a boom. The club-footed staysail is another danger to all on our boat. It can be rigged with a preventer in the same way as the mainsail, though.
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