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Ferrocement Dinghy

Home Forums Research Engineering Ferrocement Dinghy

This topic contains 81 replies, has 13 voices, and was last updated by Profile photo of shredder7753 shredder7753 4 years, 1 month ago.

Viewing 15 posts - 61 through 75 (of 82 total)
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  • #15603
    Profile photo of elspru

    Okay, so I bought one of those foldable anchors, I believe it’s called a danforth anchor.

    I also bought 21ft, or 6m of galvinized chain rated for 1900lb or 862kg.

    even though the anchor it’s rated to 216kg it doesn’t set well even if I drag it across river’s beach sand, so I have to manually set it, and put a very heavy rock on it to make it hold. Admitedly I haven’t had a chance to test out anchoring the 110kg ferrocement dinghy on the water, since someone took it for a joyride and made it holy, tied it upriver, I manged to bail it out, and get it to a beach yesterday, and I just finished repairs today.

    Also I bought 12m or 40ft of rode, though unfortunately, someone decided to snip of about 20ft of it yesterday night, they also took the quick-link… so I’m considering going all chain, and probably getting some kind of lock instead of a quick-link.

    here is a video I took today, includes the anchor, the rode, chain, dinghy, amongst a few other related things. http://www.youtube.com/watch?v=VwyvpN-_Yuk

    Does anyone have any suggestions as to what might be a good submersible lock or more permanent anchor-link which is harder/impossible for random passerby’s to steal?

    calm aware desire choice love express intuit move

    Profile photo of elspru

    Hey, so those keelbolts were still leaking, so I sawed them off,

    also I got that chain and locks to replace the rode and links

    here is the video:


    calm aware desire choice love express intuit move

    Profile photo of

    Anchor offshore and swim to the boat? There are @$$holes everywhere… I like to hide and catch them at work, but I don’t think y’all are allowed to have guns, in Canada…



    Never be afraid to try something new…

    Remember, amateurs built the ark, professionals built the Titanic.

    Profile photo of elspru

    J.L. wrote:

    Anchor offshore and swim to the boat?

    I was thinking about that, only issue is that the dinghy does sweat, a little, so I’d have to have an autobailer. Also I’m not sure I can get in the dinghy from a swimming position :-S, who knows though, maybe from the transom…

    There are @$$holes everywhere… I like to hide and catch them at work, but I don’t think y’all are allowed to have guns, in Canada…

    In Canada people aren’t allowed to have anything for self-defense :-|.

    Ya well one of the benefits of that, is that people scare more easily.

    Pirates are pretty scary, and I’ve been practising punching and kicking trees and stumps.

    I also know at least three different martial arts, and have really crazy alter-ego’s from pirate/viking lifetimes.

    Gonna move the boat in the showering rain today, the water should be higher.

    calm aware desire choice love express intuit move

    Profile photo of elspru

    Bah, I shoulda waited…

    either for the cement to cure, or for the rain/shower to commence before moving the dinghy.

    Anyhow, I got the boat in the water, there was a little leak in the bow, didn’t think much of it, could easily sponge it out.

    I managed to move it about 500m, while going over some “rapids” or in my case, slow-drag rockies, several more holes developed, all of the repairs I did yesterday came undone, also the bow-hole had developed to the size of a fist, so it became impossible to bail it, bail literally did nothing to the water level… so I turned the boat over to inspect the damage, seems like everything I had done with the epoxy-cement mix had come undone. including some abrasion to the rear portside beam.

    Anyhow, so I’ll probably have to wait untill sunday, when it’s supposed to stop raining, then I can do some repairs in pure portland/sand, shall let it dry during sunday evening and monday. more rain is due tuesday, so will move it then most likely. unless someone thinks 2 days is insufficient curing time..

    I’m hoping on at least moving it to the nearest beach, which is about 200m downstream.

    only 13.5km to go till the mouth of the river!

    Would you know, if there is some temporary measure that can be used to plug holes? perhaps plastecine or something of the like.

    — 17:07 update, I didn’t have memory card in camera when I went earlier, so went back to take a video of the boat…

    Due to my haste, and brute strength,
    moved boat before major rainfall,
    it was leaking but I still went,
    I dragged it across many rocks.

    The water level rose, and the dinghy is ruptured, so it’s at the bottom… here is the video “haste makes waste”:


    Lol, on the bright side, this is possibly the first time my dinghy has submerged.

    Though on second thought, it might be the second time, but this is the first time I caught it on video.

    calm aware desire choice love express intuit move

    Profile photo of Chucker

    Sorry to see it end like that for you.

    Profile photo of shredder7753

    ahhh shit man! that sucks.

    u know the best part about this, right?



    dont u remember Oregon Trail, dude? this is what happens when u ford the river. i knew that since i was like 10.

    and let this be a lesson for all fellow steaders (not Seasteader-). this is just one of the many failures we will have on the way to success. we learned from it.


    My Work II

    “Leadership and do-ership are not the same thing”

    Profile photo of elspru

    Yo guys relax, be patient, it’s just some high water, the boat has been submerged before and recovered, sure the damage was less, but it’s still anchored, so quite possibly fine. as soon as the river gets lower, can make some repairs.

    Cement is cheap, I’ve still only used less than 2 bags to construct it, that’s like $24.. it’s way cheaper to patch up a boat, than to build a new one. Even if all the cement was pulverized, it would still be cheaper, and believe me, that mesh and rebar is fine, it’s completely oblivious to these low velocity impacts.

    All this calls for is perhaps an upgrade, just behind where the dinghy is, I found some sheet metal, which was there so long it looked like a rock from algae, Perhaps I can recover it, and attach it somehow to the bow of the boat, it would then have extra protection, somewhat like a sheath. Perhaps I can use some of that anchor caulking that Shredder was talking about.

    Who knows though, it was relatively near some relatively deep water, and the anchor was set nearby, if it got rolled much, could be in some of that deeper part of the river…

    Oh the suspense! technically we shall find out on Sunday or Monday..

    Kinda like Jesus Easter, but first friday of the Autumn Equinox,

    The Dinghy that sank on friday, and rose again on sunday. lol :-)

    calm aware desire choice love express intuit move


    elspru, i think your project shows in almost classic ways – how things work out different when you do a pilot project.

    On the threads i always insisted on the fact that the handling of third party interfrence is one of the most important issues in float out project management. I remember that when i had my 20 ton sub anchored in lake Atter in summer i would find literally dozends of people swim out to the anchorplace and climb on top of the hull to satisfy their curiosity.

    I find it interesting that you say that you used only S24 to build your dinghy. You ended up with a mini living space bubble – small enough to be damaged by funny people passing by – trying to have a ride.

    I would suggest to make it bigger – some 4 m diameter – so you can enter it by a burglar prove door, and it can not be taken away from anchorplace by a “funny guy”. Once you have that living space shell that is all side closed you get annoying third party closed completly out. You can live inside, any tool, sleeping bag, you leave inside is protected until you return. The building site is inside the shell – so free of third party interference.

    Anchor the shell more than a swimming distance off shore, make it sufficiently streamlined that you can go to places where you will not be molested.

    When we had the “minimum start up discussion” we discussed the size sweetspots – you are currently at a size that is too big to take it home and protect it in your backyard, but still too small to close it like a trailer or a log cabin with a burgler safe door.

    That makes the project vulnerable to events as you are experimenting. Going bigger and make it close-able might have been more economic at the end.

    To recover and stop the leak i would recommend to pull a plastic sheet under it and pull the borders of the sheet above the surface. So you can bail out and repair afloat.

    Keep going…



    Profile photo of tusavision

    I’ve heard stories of boats recovered by filling them with hundreds of ping pong balls. In your case, dry ice might be a little bit more in line with your financial goals.

    Profile photo of georgeberz

    Have you though of using grancrete to patch or make a new hull out of, like concrete in a sack but better 6000+ psi cures in 10-20 mins waterproof



    Profile photo of elspru

    The Dinghy has risen.

    Indeed it has Risen.

    later on, we could have submersible commemorations, where there would be a challenge to stay submerge on friday after autumn equinox, and to rise on sunday.

    Anyhow ya, somehow miraculously, since it was a holey boat perhaps due to some hydrodynamic shape,

    but the boat was was lifted by the river, and beached on the highest part of the river,

    pressed hard into some trees, so that it’s gripes were bent down 90 degrees,

    anyhow now it’s sitting with even it’s bottom out of the water, on some rocks,

    That is truly likely the best case scenario, given the circumstances..

    Anyways here is a video I took when I found it this morning:


    btw, Ellmer, thanks for the support, :-).

    Oh and George in terms of Grancrete, the Canadian Tire version is Quikrete, a portland based quick setting cement, sets in 10 minutes. $15 for 4.5 kg. http://www.canadiantire.ca/AST/browse/3/HouseHome/HomeRepairMaintenance/RoofRepair/PRD~0490370P/Quikrete+Quick-Setting+Cement%2C+4.5+kg.jsp?locale=en It’s for roof repair… roofs typically have to be fairly waterproof…

    Oh yes, and there was a mild story to making the video, were several signs for me to check on it, like getting up early, and spirit guide mentioned it, I had gone to bronze sailing class, but then forgot my keys and cellphone, so I peddled back, found keys at home, and then went to find the dinghy, I found it, in it’s wonderful location, there is even a little bit of sand there if I’m correct, not sure if that silt is usable though possibly.

    Anyways it was quite a relief that it is available, and in a place where it can be repaired.

    calm aware desire choice love express intuit move

    Profile photo of OCEANOPOLIS

    I do hate to see any boat going to the bottom, and belive me, I’ve seen a few going down and being swallowed by the sea…and nothing or nobody could do anything about it, that was the sad part abot it, getting to that point of no return….The key factor is NOT to get to that point. In order to do that, good seamanship skills should always be observed. After all, keep in mind that when the smoke clears, in most of the cases IT IS ALWAYS the captain’s fault, no matter what the circumstances are. So,…. it is your fault that your dinghy ended up as a salvage operation now.

    That being said and done, and since you should consider yourself a happy camper that you still have a dinghy, I would advise that you tow to a working location, turn upside down, fix the holes and fiberglass the whole bottom @ least from the water line down, IMHO.

    Profile photo of georgeberz

    Oceanopolis, he made it pr4etty clear to me when I suggested fiberglassing, that “he did not want a fiberglass boat”

    my opinion is it is still a concrete boat with a protective coat of fiberglass and this woul dnot have happened.

    to each thier own…

    he also misread the grancrete link I sent in his haste, said it was a portland based product, no I believe its magnesium based it is not concrete but very similar.

    People must remember concrete is very brittle (no tensile strength)

    but you have to give him credit for trying.


    Profile photo of elspru

    Ya, so due to the glory of concrete, it has been easily repaired, the repairs took about 1hr, maybe an 1hr and a half.

    While I was bailing sand out of the dinghy, there was a crowd of over a dozen people watching me,

    so I didn’t make a video until the coast was clear, which was after I had already finished it.


    When I was leaving, there were at least three people, there on the coast watching me,

    I told them to vote for the pirate party, they agreed, then I biked home.

    Anyhow, my strategy was to start with the water-plug cement I had gotten, to seal the bottom side holes, and ordinary portland cement to repair the above-water-line damage.

    Ya but I did all the repairs onsite, with minimal movement to the boat, I did lay some additional rocks under it, so the load would be more evenly distributed.

    The sand I used was mostly from the pile that I had bailed out of the boat, it must have somehow collected there, I’m assuming during the high water.

    calm aware desire choice love express intuit move

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