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Styrotree Catamaran

Home Forums Research Engineering Styrotree Catamaran

This topic contains 9 replies, has 4 voices, and was last updated by Avatar of elspru elspru 2 years, 9 months ago.

Viewing 10 posts - 1 through 10 (of 10 total)
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  • #1651
    Avatar of elspru
    elspru
    Participant

    So earlier, figured out that styrofoam is one of the cheapest sources of boyancy.

    Based on this, designed a drydock catamaran. Now the model has been built.

    here is a picture of it floating in the tub:

    here is the video:

    http://www.youtube.com/watch?v=32CIqYYOCPE

    used marlin hitches in parcel lashing to get it to stick together,

    also made this one of multiple styrofoam pieces, helped keep them firm

    by tieing in a piece of wood alongside the styrofoam, also helps to distribute load.

    #15769
    Avatar of elspru
    elspru
    Participant

    now thinking about it, when the boat descends, the back (or front) beam of the catamaran would have to be retractable, preferably there would be a secondary arc beam, to maintain catamaran shape for the interval of time it takes the boat to either back out, or for the catamaran drydock to sail forward.

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    #15895
    Avatar of elspru
    elspru
    Participant

    xns wrote:

    On a practical note, Barrels are easier to find in our region and there’s far less chance of them disintegrating and finding their way into plankton feeding fish while carrying hydrophobic pesticides.

    why would styrofoam have pesticides?

    That and styrofoam soaks up water over time. Anyway, I’ll just say from experience that styrofoam with black plastic coverings didn’t stand up to UV, friction and animal life very well. Barrels on the other hand are still perfectly intact.

    an option that I have forseen is that we could paint or spray the styrofoam with acetone, this will melt the top layer together, so it’ll become more waterproof, and should hold together quite well, it can also be shaped to be more hydrodynamic in this way. we could then simply paint the styrofoam a greyish color rather than using plastic bags.

    I’ve already tested it on a small scale with a piece of styrofoam, though I used too much acetone, so it shrank quite significantly, shaped it into an ankh, still kinda squishy, it floats, put it into water bowl, shall see how impervious to water it be.

    Another option is to use a heat-source that can melt the styrofoam, and so the surface could be melted togethr to be seamless.

    We with You are a Network, our goal to become technologically-enabled reproducible family communities. http://weyounet.info

    #16078
    Avatar of Chucker
    Chucker
    Participant

    Coat the styrofoam with a layer of concrete maybe? You seem to have had good luck with thin layers of concrete.

    Just a thought.

    #16157
    Avatar of Elwar
    Elwar
    Participant

    Some boats have a styrophoam inside so that if the boat gets a hole in it or springs a leak it will not sink.

    #16505
    Avatar of elspru
    elspru
    Participant

    Elwar wrote:

    Some boats have a styrophoam inside so that if the boat gets a hole in it or springs a leak it will not sink.

    Yes, that demonstrates it’s already being used in many areas.

    I bought some styrofoam from home-depot today, also a steaming iron from home-depot.

    So can start working on making a pontoon, this one is about 100kg of boyancy at the moment.

    I found out that the larger plasti-spans are actually priced per single unit, so that drastically increases the price.

    I redid the spreadsheet for floating objects

    http://www.scribd.com/doc/66826680/Floating-Objects-for-Rafts-Dry-Docks

    Cooler bottles are now most expensive, since they require a $10 deposit in Canada so cost as much, making them at $500 per ton.

    However now the 750ml and 2L bottles are cheapest, assuming you can get them at $0.10 to $0.30 each, with a ton of boyancy costing $130-$150.

    Styrofoam is still a viable option,

    though now is at $163-$181 per ton,

    in some ways more reliable and easily manageable.

    It’s still less than half the price of equivalent boyancy from concrete shells, $450-500 per ton boyancy.

    here is the updated floating objects spreadhseet:

    http://www.scribd.com/doc/66826680/Floating-Objects-for-Rafts-Dry-Docks

    We with You are a Network, our goal to become technologically-enabled reproducible family communities. http://weyounet.info

    #16562
    Avatar of georgeberz
    georgeberz
    Participant

    55 gallon plastic transport barells used are about $20 or less it will give you 55+ gallons of displacement 467.5 lbs + the amount of plastic so possibly 500 lbs submerged

    so 4 would displace a US ton 2000 lbs

    I have a written quote from a recycling company to provide food grade, triple washed with clamp on removable lids for $16 ea if bought by the truckload 300 ish if I remember

    George

    http://outpostalpha.com

    #16563
    Avatar of georgeberz
    georgeberz
    Participant

    Also while I was looking at making dome houses out of polyurethane foam 100%

    Ployurethane foam was around $2.65 per pound in 2 (part a and part b ) drums

    standard wall filler mix waterproof closed cell 1.5 lbs per cu’ about the same strength of styrofoam and youcan have the stuff mixed up to 16 lbs per cu’ for really hard shit..

    Make a mockup of what you want and spray away to make your form in any fanciful way.

    I initially wanted to inflate a tyvec material into a series of interconnected domes then foam form the inside 6″ thick voilla, instant house…

    George

    http://outpostalpha.com

    #16571
    Avatar of elspru
    elspru
    Participant

    georgeberz wrote:

    55 gallon plastic transport barells used are about $20 or less it will give you 55+ gallons of displacement 467.5 lbs + the amount of plastic so possibly 500 lbs submerged

    so 4 would displace a US ton 2000 lbs

    I have a written quote from a recycling company to provide food grade, triple washed with clamp on removable lids for $16 ea if bought by the truckload 300 ish if I remember

    George

    http://outpostalpha.com

    Hmmm that’s why I don’t like imperial system, the number of evaluations makes it confusing.

    but anyways, so those are 208Lt barrels, displacing 208kg.

    Really $20? the cheapest I found online was $110.

    I submited a quote request at local recycling center.

    Though ya, if you could find them for $20 each,

    you could float a ton for $100, making it the cheapest option.

    Got a quote from local recycling center,

    said water-tested barrels for $25.

    with a per ton cost of $120,

    still the cheapest option.

    Nice, I like it. now we simply have to construct a platform we could camp out on.

    though I can imagine the winds could get pretty high coming off the lake at times,

    low or fold-in tents would be best. gotta make sure to have supplies to work proficiently.

    Can do small trials on the pond near where I live.

    Also gotta set up a solar-panel system at home for practice,

    in order to implement the integral current cathodic protection.

    Perhaps I’ll set up a salt-water aquarium and practice growing corals… :o

    We with You are a Network, our goal to become technologically-enabled reproducible family communities. http://weyounet.info

    #16572
    Avatar of elspru
    elspru
    Participant

    georgeberz wrote:

    Also while I was looking at making dome houses out of polyurethane foam 100%

    Ployurethane foam was around $2.65 per pound in 2 (part a and part b ) drums

    standard wall filler mix waterproof closed cell 1.5 lbs per cu’ about the same strength of styrofoam and youcan have the stuff mixed up to 16 lbs per cu’ for really hard shit..

    so would that be 1inch thickness?

    hmmm, so that’s about $42.78 per square meter,

    or considering it’s R value is 6 it’s $7.13 per square R meter.

    that would be about $616 per R for insulating a bachelor sized boat.

    and $1095 per R for insulating a nuclear family sized boat.

    Make a mockup of what you want and spray away to make your form in any fanciful way.

    I initially wanted to inflate a tyvec material into a series of interconnected domes then foam form the inside 6″ thick voilla, instant house…

    George

    http://outpostalpha.com

    Main issue with making something purely out of urethane is degradation from sunlight.

    Polyurethane spray foam with R-value of 6 would make great insulation,

    I’m considering spraying the inside of the hull,

    it could be like a layer of fat,

    both insulative and waterproof.

    We with You are a Network, our goal to become technologically-enabled reproducible family communities. http://weyounet.info

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