3d printed all concrete canoe (ducks and gets coat)

Discussion in 'Materials' started by Tiny Turnip, May 6, 2018.

  1. Tiny Turnip
    Joined: Mar 2008
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    Tiny Turnip Senior Member

  2. alan craig
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    alan craig Senior Member

    It weighs 114Kg despite optimising algorithms, and requires a tensile fabric skin which would work with just paint. And why the giant box of sand presumably to support the weight of the filled mould before it sets, surely the mould should have printed supports? Sorry, I'm being a bit cynical here.
     
  3. Tiny Turnip
    Joined: Mar 2008
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    Tiny Turnip Senior Member

    Hi Alan

    that's fine - thanks for the comment. A little skepicism is important!

    I'd comment that first, Dezeen is a good, wideranging design site, but tends to be uncritical, and is mostly focussed around architecture; I'm frustrated that there isn't more detailed information here. Will try to find some.

    Obviously any concrete canoe is never going to be a practical solution to anything, because the weight will always negate the portability. Its value lies in being a vehicle for experimentation, learning and fun, whether at the university or back yard level.

    I thought using the sand box was good; a cheap, easy and practical way of supporting the formwork.

    The things I found interesting about this were the use of the time consuming 3d print to make the formwork, not the actual piece, so offering the possibility of faster production runs through moulding.

    The use of the maths to make the canoe into a geodesic structure. It would seem to me that this structure works largely in compression, like an egg shell with a lot of triangular holes cut in.

    They talk about a 'concrete membrane' as the skin, which sounds interesting, and I'd like to know more about it. The rules of the competition require the canoe to be entirely concrete.

    Although the boundaries are always blurred, This seems to me more of a true framed structure where the frame is doing most of the work, and the skin not much, rather than a full on stressed skin (skin on frame) as seen in the beautiful geodesic aerolite boats.

    I could foresee possible developments using the maths and 3d printing/cnc to form foam core with structural triangulated resin ways, working with vacuum infusion perhaps?

    Cheers

    Adrian
     
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  4. JosephT
    Joined: Jun 2009
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    JosephT Senior Member

    Agree with Tiny. One of the main benefits of a canoe is being light weight. 114kg is just too heavy. Too bad they didn't use a thinner, buoyant plastic for the frame. That one is just too thick. Historically, skin-on-frame canoes & kayaks are the lightest in their class. It makes no sense to have all that weight and extra strength when someone can walk up and poke a hole through the skin and sink it.

    Here's a better application with a 3D printed kayak.


    This 3-D Printed Kayak Is Actually Seaworthy http://www.slate.com/blogs/future_tense/2014/03/26/_3d_printing_a_kayak_jim_smith_kayak_grassroots_engineering_3d_systems_siskiwit.html
     
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