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Thread: Flopper Stopper plans?

  1. #1
    Contributing Member I
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    Flopper Stopper plans?

    Does anyone out there have plans for a do-it-yourself flopper stopper?

  2. #2
    1984 Ericson 30+, Nanaimo, BC
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    What the heck is a "flopper stopper"??
    Frank.

  3. #3
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    It's a roll attenuation device, right? Like the "birds" on a fishing boat?

    You could certainly just hang an anchor off the boom in the water. Or hoist something heavy to the top of the mast (that will increase the period of the roll). I don't think that stuff really works all that well though.

    Not sure if the commercially available products work either. I haven't tried any. I just make a point of finding an quiet anchorage whenever possible.

  4. #4
    Accelerant CaptnNero's Avatar
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    Quote Originally Posted by NateHanson View Post
    It's a roll attenuation device, right? Like the "birds" on a fishing boat?

    You could certainly just hang an anchor off the boom in the water. Or hoist something heavy to the top of the mast (that will increase the period of the roll). I don't think that stuff really works all that well though.

    Not sure if the commercially available products work either. I haven't tried any. I just make a point of finding an quiet anchorage whenever possible.
    Displacement sailboats already have that great big mass in the keel and the mast itself, so I don't think hanging something from the mast even as long as it is would matter much. Also, the keel has a bunch of lateral drag which would reduce roll somewhat. Besides, if you do hang something up there you need to do something so it won't cause any damage.

    I've seen the flopper stoppers on powerboats with their wave conforming non-displacement hulls but never on a sailboat. I suppose it might be worthwhile on a catamaran sailboat because of the power boat like wave conforming behavior.
    -- neal
    S/V KOKOMO
    '88 E34 #253
    Get there fast and take it slow

  5. #5
    Contributing Partner HGSail's Avatar
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    I don't have plans, But we use them all the time out here on the left coast. I have one but I'm repairing it now. I can post pictures later.

    Pat
    E29
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  6. #6
    Accelerant CaptnNero's Avatar
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    Quote Originally Posted by HGSail View Post
    I don't have plans, But we use them all the time out here on the left coast. I have one but I'm repairing it now. I can post pictures later.

    Pat
    E29
    '73
    #224
    Holy Guacamole
    When you do that this thread may lead to some flopper-stopper envy !
    -- neal
    S/V KOKOMO
    '88 E34 #253
    Get there fast and take it slow

  7. #7
    Principal Partner Keith Parcells's Avatar
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    Thumbs down flopper stopper tales

    Ian,
    Why don't you check out a Davis flopper stopper? See http://www.davisnet.com/marine/produ...asp?pnum=00352
    They seem to be pretty cheap - $27 -45, approx. They appear to be very light.

    I have two flopper stoppers. One is a Magma & the other is brand unknown. I have used them, but had problems. The problems might have been related to my specific boat design, or was it my deployment technique? They are also a bit heavy. But they DO reduce the roll.

    The problem; my boat is a fractional rig with quite a bit of pre-bend to the mast. These things are deployed from the end of the boom, swung out abeam. The halyard supports the end of the boom. Our setup apparently caused the mast to fflex, then spring back. I doesn't sound like a big deal, but after hours of this, wee small hours of the am, the boat had completely swung around, 180 degrees from the wind & swell & all the other boats! Oh, did I mention we also had a stern anchor out! That stern anchor was completely dragged around to the opposite side of the anchorage. It could have been bad if the achorage was more congested.

    An by the way, this happened on two different occasions, so it was no fluke!

    Keith
    E-33

  8. #8
    Moderator Guy Stevens's Avatar
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    Milk Crates

    Milk Crates, the good ones that you get from the milk truck guy when you offer to take him sailing, not the ones that you buy at the hardware store.

    A couple of pieces of light plastic, which is flexiable thin stuff.

    Zip ties.

    A good knowledge of some basic knots to make a bridle.

    Cut the plastic to fit the bottom of the milk crate, place the plastic in the milk crate. Punch holes in the edges of the plastic allowing a good margin for strength. Zip tie the plastic to the bottom of the milk crate. With a sharp knife cut the plastic on the diagonal from each of the four corners to the corner diagonally opposite it.

    Tie the bridal system to the top using some STRONG knots and GOOD Fairly non stretch line.

    Hang outboard on spin poles etc when you want to use them. When you don't organize that aft locker space using the milk crates, just don't mess up the plastic.

    Guy
    :-)
    Last edited by Guy Stevens; 09-15-2006 at 12:04 PM.

  9. #9
    Accelerant CaptnNero's Avatar
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    Quote Originally Posted by Guy Stevens View Post
    Milk Crates, the good ones that you get from the milk truck guy when you offer to take him sailing, not the ones that you buy at the hardware store.
    ...
    This is great forum stuff. Roll your own.

    I'm curious as to when people tend to use these. Do people on the left coast whip them out just for a rolly overnight or is it more for long term anchoring ?

    On the Chesapeake one might be able to combine Guy's milk crate device with a crab trap for even more payback.
    -- neal
    S/V KOKOMO
    '88 E34 #253
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  10. #10
    Principal Partner Jeff Asbury's Avatar
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    Rocker Stoppers & Roll Controls

    I think the term is Rocker Stoppers or Roll Controls

    I have seen them used quite a bit at Catalina Island at some of the less protected anchorages. Usually on the bigger boats not using a public mooring, but at anchor. Some times they are as simple as swinging the boom out to one side and a spinnaker or whisker pole on the other side and tying buckets with holes in them to the boom and pole. The off the shelf types are usually stainless rectangular plates that are hinged.

    I have thought about rigging something up a few times but it looks like a bit of a hassle. I am usually at the Island for only 2 or three nights. If I were to be at anchor for longer I might consider it.
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  11. #11
    Accelerant CaptnNero's Avatar
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    proximity preventers

    Quote Originally Posted by Jeff Asbury View Post
    ...Some times they are as simple as swinging the boom out to one side and a spinnaker or whisker pole on the other side and tying buckets with holes in them to the boom and pole. ...
    Jeff, the mere sight of a boat with projecting poles looks like a good way to discourage others anchoring too close !
    -- neal
    S/V KOKOMO
    '88 E34 #253
    Get there fast and take it slow

  12. #12
    Principal Partner Jeff Asbury's Avatar
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    I seen em!

    Well, what can I say, but they are quite common at Catalina & Channel Islands where we all have quite a bit of swell action at unprotected areas. Usually the boom and poles are not swung all the way out. Maby only 20 degrees or so, but that's how they do it. I seen em!
    Jeff Asbury "Pride of Cucamonga" 1973 E-27 Hull#355

  13. #13
    Principal Partner Jeff Asbury's Avatar
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    The "Rock 'n Roll" Boat Stabilizer.

    The "Rock 'n Roll" Boat Stabilizer.
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    United States Patent No. 5,095,839
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    http://www.magmaproducts.com/Product...tabilizer.html
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    Jeff Asbury "Pride of Cucamonga" 1973 E-27 Hull#355

  14. #14
    Contributing Member I
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    Thanks

    Nice to see all the responses. The milk crate idea is the closest for what I am looking for. The boat is in Panama and it costs a bit to ship things down here so a self made one is my plan. I am heading out into the Pacific in a while and I have heard there are a lot of rolly anchorages along the way.

  15. #15
    Senior Moderator Loren Beach's Avatar
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    Lightbulb Plan B, maybe

    http://www.wbryant.com/StellaBoat/Pr...ogue/index.htm

    I was thinking that if you made up a smaller number of cones, like maybe 10, and put a fishing weight at the bottom, you would have a flopper stopper -- need one set per side.
    Just an idea... for someone with a sewing machine and some time to put it to use.

    This would store a lot easier than a solid device, too.

    LB
    1988 Olson 34 #8
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