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Old 06-23-2015, 12:07 AM   #1
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Flopper stoppers

Hi all I'm thinking about fitting flopper stoppers on my boat has any one used them and what is your experience.

I have a heritage east Sundeck 40 has any one fitted them to one of these boats and if so would be great to hear where and how you fitted them.
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Old 06-23-2015, 12:21 AM   #2
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When you use the term flopper stopper are you referring to paravanes to be used while underway or things used to prevent rolling at anchor? I was once chastised on this forum for calling paravanes Flopper Stoppers. I how ever, stand on my vast experience and say that Flopper Stopper has been used as the slang for paravanes by knowledgeable boatmen for more than forty years.

Oh wait, you said Flapper Stopper, no idea what that is.😀
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Old 06-23-2015, 12:27 AM   #3
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When you use the term flopper stopper are you referring to paravanes to be used while underway or things used to prevent rolling at anchor? I was once chastised on this forum for calling paravanes Flopper Stoppers. I how ever, stand on my vast experience and say that Flopper Stopper has been used as the slang for paravanes by knowledgeable boatmen for more than forty years.

Oh wait, you said Flopper Stopper, no idea what that is.��
Hi sorry I did mean flapper stopper. Yes it's for when we are at anchor
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Old 06-23-2015, 02:16 AM   #4
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If I had a flapper on board, the last thing I would want to do is stop her (although my wife might throw her over just to watch her control the roll)!
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Old 06-23-2015, 06:03 AM   #5
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I'd like to know too, since my birds don't do as good a job at anchor.

I thought I have seen something that looks like a large disc.

And i too called my paravanes flopper stoppers, as Beebe did.
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Old 06-23-2015, 07:43 AM   #6
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I think they are paravanes on the move with delta shaped fish.
The same poles become flopper stoppers when at anchor usually with a square shaped crate with flaps that open when the boat rolls and the crate drops.
As usual with boats there is quite a variety on offer.
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Old 06-23-2015, 08:01 AM   #7
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On Bay Pelican we use the Magnum Rock and Roll stabilizers. These are two "fish" approximately 36" x 18" when open that drop from 9' polls on each side of the boat. They are hinged so that when dropping they are closed and when being pulled up they open and act as a break on the roll.

Effectiveness has been substantial and immediate. Won't completely stop roll and can be overcome by substantial waves but are extremely useful.
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Old 06-23-2015, 08:04 AM   #8
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Generally the term "flopper stoppers" are used for the type of stabilisers used at anchor.

These have a much larger surface area than the "birds" used with a paravane system. They are many different types of flopper stoppers, but generally they are designed to sink easily and provide resistance to any upward motion.

They can be used on paravane arms in place of the birds, or on a sailboat's boom hung out to one side, or even hung directly off each side of the hull. The further they are extended to each side on some sort of outrigger, the more effective they are.

My mate has some home built flopper stoppers on his sail boat, and they certainly reduce the rolling at anchor.

Here are a few types of flopper stoppers found on a google search.
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Old 06-23-2015, 09:36 AM   #9
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Quote:
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...Here are a few types of flopper stoppers found on a google search.
I'll take a dozen of the last set please
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Old 06-23-2015, 09:39 AM   #10
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I wonder where I would fit them and how much force on the boat they would have. Is it possible to fit them so there not in the way when not in use
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Old 06-23-2015, 09:58 AM   #11
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I'll take a dozen of the last set please
Doesn't TF have a dress code? Just wondering....
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Old 06-23-2015, 09:59 AM   #12
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We have been using the Magma system on our trawler for some years in the Sea of Cortez. It works well after I made some modifications.

I lengthened the original 8' poles to 12' and this made a significant difference. The 6061 alloy aluminum poles slide inside each other for retrieving / storage.

Also, I replaced the original nylon end pieces on the poles. As the flopper down line rubbed through these end pieces during rolling of the boat, it would squeak and drove the Admiral crazy. This action also wore a groove in the nylon, down to the pole; not good. I fabricated new end pieces from aluminum and no more squeak.

I changed the fore and aft guys on the poles to braided cable with snaps on the ends to make hook up easy. When underway, we just lift the poles, remove the floppers using snap shackles on their lines, and secure the poles vertically.

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ID:	41324Using these "roll dampeners" on our shallow draft, semi-displacement hull trawler has been well worth the cost, and made uncomfortable nights at anchor much less of a problem.
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Old 06-23-2015, 10:01 AM   #13
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Quote:
Is it possible to fit them so there not in the way when not in use
The Seabrake drogue is advertised as being effective when used similar to the above products. It seems to stow well (folds up).
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Old 06-23-2015, 10:04 AM   #14
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I have been on a couple of boats that have ForeSpar Flooper Stoppers. They do just as advertised. They sell the complete kits. Easy to set up and take down.

Roll Stabilizer Flopper Stopper
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Old 06-23-2015, 10:21 AM   #15
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Doesn't TF have a dress code? Just wondering....

That is not a dress... but they sure look sweet.

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Old 06-23-2015, 10:56 AM   #16
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I wonder where I would fit them and how much force on the boat they would have. Is it possible to fit them so there not in the way when not in use
We fitted our Magnums amidship. The poles come with a boot into which the fitting on the end of the pole slides and then the pole is also secured with three lines, two horizontal and one vertical.

Krogen 42s have a double hull and we opened up the inside hull (4" hole saw) and then put a backing plate on the inside of the outer hull to fasten to the boot. This has been sufficient for years as I believe most of the strain is put on the vertical line. Vertical line is attached to a cleat I put on the underside of the upper deck, again with a backing plate.
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Old 06-24-2015, 01:17 AM   #17
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Prime Fabrication makes a high quality flopper stopper made for heavy duty continuous use. Primefabrication.com
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Old 06-24-2015, 01:50 AM   #18
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Here's my flopper stopper setup. It's a one-off design fabricated by the previous owner.

Despite stopping in the occasional ocean anchorage, I haven't needed to deploy them (yet).

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Old 06-24-2015, 07:57 AM   #19
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Quote:
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On Bay Pelican we use the Magnum Rock and Roll stabilizers. These are two "fish" approximately 36" x 18" when open that drop from 9' polls on each side of the boat. They are hinged so that when dropping they are closed and when being pulled up they open and act as a break on the roll.

Effectiveness has been substantial and immediate. Won't completely stop roll and can be overcome by substantial waves but are extremely useful.
That has been my experience with them as well. I also have had very good results with the orange cones. I just use a couple more on each side than the minimum recommend. The draw back to the cones is if you are anchored in shallow water they may hit or sit on the bottom. As the more cones you use the farther they have to hang down in the water.

After using roll reducers I think you'll findvyou don't want to anchor without them.
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Old 06-24-2015, 08:58 AM   #20
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Doesn't TF have a dress code? Just wondering....
No silly - Only an Un-Dressed code!

Those picts may be in some OTDE thread!
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