Cash prize of 250 GBP - Dinghy Design Competition

  • 07 Apr 2021 19:27
    Reply # 10284349 on 10211344
    Anonymous member (Administrator)



    Layout and sailplan for Halibut (ver. B)

    Here is the (sail-friendly) version B of the Halibut, shown with thwarts, oarlocks and rig. I have made the cockpit longer by reducing the buoyancy tanks at the ends a little. I suggest sticking 50mm thick foam to the topsides instead. I also have an idea of tying a row of fenders to the gunwale, and preferably first sew these into ‘a sausage’ of canvas. This will have three purposes:

    • ·         Fenders
    • ·         Sprayrails
    • ·         Added buoyancy

    The diameter of the fenders could be anything from 50 to 150mm. Personally, I would aim for around 80mm if available.

    In addition, I have sketched on a rudder and a bow-board. The bow-board can be constructed in seventy-two ways. Not sure which version to go for, but all versions will have some sort of wooden peg or weak link to let the board break free, in case of running aground.

    Cheers,
    Arne


  • 06 Apr 2021 12:10
    Reply # 10278679 on 10277848
    Anonymous wrote:
    Gary wrote:

    Well Arne's rig has caught my interest. I'm looking for a JR to put on my Bolger Cartopper. Though 5 sq m would be better. I did draw up something but i think I lost it in a tidy up.

    Gary, if you multiply Arne's dimensions by 1.5, so that the battens become 3m long, the area works out at 5.7sqm which would be quite a good size for your dinghy, I think.
    Thanks David. 
  • 06 Apr 2021 08:00
    Reply # 10277848 on 10276602
    Gary wrote:

    Well Arne's rig has caught my interest. I'm looking for a JR to put on my Bolger Cartopper. Though 5 sq m would be better. I did draw up something but i think I lost it in a tidy up.

    Gary, if you multiply Arne's dimensions by 1.5, so that the battens become 3m long, the area works out at 5.7sqm which would be quite a good size for your dinghy, I think.
  • 06 Apr 2021 07:47
    Reply # 10277808 on 10273994
    What we lacked was a JR that was a good match with a yacht's tender. We no longer lack that rig. Arne should be declared the winner by acclamation.

    Hear, hear. The Halibut rig is a major step forward, again demonstrating Arne's ability to think sideways. The bowboard concept is new to me too, further widening my education. 

  • 06 Apr 2021 00:35
    Reply # 10276602 on 10211344

    Well Arne's rig has caught my interest. I'm looking for a JR to put on my Bolger Cartopper. Though 5 sq m would be better. I did draw up something but i think I lost it in a tidy up.

  • 05 Apr 2021 17:36
    Reply # 10275241 on 10211344
    Anonymous member (Administrator)

    Since it appears that there is more interest in Halibut’s JR than the hull, I now drew up the sail more in detail. I guess I will write a little text around it, as well, and thus make a complete little write-up.
    For now, I just let you have the diagrams.

    Arne


    (Arne's sketches section 5, photo 20-22)

    Last modified: 20 Mar 2023 10:18 | Anonymous member (Administrator)
  • 05 Apr 2021 13:34
    Reply # 10274569 on 10274410
    Anonymous member (Administrator)
    David Tyler wrote:

    I would prefer to design a dinghy because a 'client' has approached me with a specific list of requirements and told me that there is no existing design that satisfies them. But yes, first we have to learn how to design dinghies.


    Yes,

    but in my case I am the ‘client’. Good, lightweight tenders are not to be found here, so one has to build something. One tender I had (looking like a scaled-down speedboat) was so bad (.. it was a trap...) that when a fellow asked me to borrow it for the weekend, I said yes on the condition that he promised to sink that thing on deep water after use. He made big eyes when hearing my request, but sure enough, after having ’enjoyed’ it, he understood, and he sank it.

    Arne


    Last modified: 19 Feb 2022 23:40 | Anonymous member (Administrator)
  • 05 Apr 2021 13:02
    Reply # 10274410 on 10211344

    Arne wrote:

    PS to David. We don't design dinghies because we have to  -  we do it because it is fun, and because we may learn something in the process. I, at least have still a lot to learn  -  I've learned...

    I would prefer to design a dinghy because a 'client' has approached me with a specific list of requirements and told me that there is no existing design that satisfies them. But yes, first we have to learn how to design dinghies.


  • 05 Apr 2021 12:54
    Reply # 10274332 on 10211344

    I was going to suggest modelling at 1:5 as a point on the learning curve.

    How about making PDFs at 1:5 and taking them to a copying shop for printing on thick A2 size card? You can then cut out the pieces with a craft knife and sew them together. This would be the quickest way I can think of.

    Ping pong...

  • 05 Apr 2021 12:29
    Reply # 10274175 on 10211344
    Anonymous member (Administrator)

    As for that design competition  -  I wish it will go away.
    The resulting design of mine, not least the rig, has been a product of fertile mental ping pong between several of us.

    Mental ping pong  -  now that is something I like!

    Arne

    Last modified: 05 Apr 2021 13:38 | Anonymous member (Administrator)
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