KISS by Slieve and his grandsons

09 May 2021 09:04 | Anonymous member (Administrator)

I think the attached design which my grandsons developed years ago answers the design brief quite well.  I am entering my write up of their work on their behalf. I hope this is permissible with the rules. Slieve's write up - and the story of how he and his grandsons came up with the design is in this document.


  • 16 May 2021 19:51 | Anonymous member (Administrator)
    I found Slieve's entry so interesting that I not only built a near copy (scaled up 12%) of the cardboard model, but I even wrapped it in cling-film and launched it in a bucket. Then I loaded it to to see if it could carry some weigth. When I was satisfied with the model floating at a 'medium heavy state', I lifted it out and put it on my digital scales. It showed 238g. Since it was a 1:10 model, the 238g would mean 238kg in a full-size dinghy. It looked to me that the boat was in the 2-3 person category. That thing would be dead easy to stitch together, and it looks good as well.
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  • 18 May 2021 22:42 | Anonymous member
    This delightful concept looks to be the simplest and lightest of all the entries (and possibly the easiest to build). A bit more detail would be helpful - from what I can imagine, it is perhaps the dinghy with the most appeal.
    Absence of built-in buoyancy probably makes most sense on a dinghy this size - saves work and weight (as I am finding right now while I add buoyancy tanks to my Golden Bay). There's a lot to be said for simply buying buoyancy bags (they sell them here for Optimists) and just poking them under the thwarts. The kick-up rudder description sounds so very close to Arne's hinged transom plate that I think I would use Arne's detail there, with Slieve's bungy cord arrangement for strapping it in place and allowing quick removal. Dagger board alongside the central fore-and-aft rowing bench seems like a perfect solution - and the slot in the same bench to make a kind of tabernacle adds further duality and economy - its more clever than it looks. It should be possible for the mast to be placed far enough forward to still allow rowing, and to allow a demountable 3-point (gunnels and bow) "partners" to remain in place while rowing too - but with a higher balance sail plan this might not be possible - without a sail plan it is difficult to evaluate. The devil may be in the details - and the details aren't there to check. I don't think an outboard is such a good idea on a dinghy this size and it ought not to be necessary - however, it is not a bad idea to allow for one, and it should go to one side. There is no advantage in an outboard being on the centreline. Making the centreboard (and rudder) out of three sheets instead of the usual two (and thus using up offcuts in the centre layer) is another clever idea. If you like using lots of glue.
    I prefer the laminated gunnel pieces to be on the outside where they serve a purpose as beltings in addition to their structural value. Alternatively, one layer each side, and a very light capping made from offcuts (not plywood) can add a nice touch. More work, but the capping covers end grain and can be integrated tidily with knees in the four corners of the boat. I like the outside placement best because if there is no structure on the inside at the gunnels, it makes it nice and easy to put the dinghy on its beam-ends and completely empty it of water (are you supposed to do that?)
    That centre frame jars a little, to my eye – doesn’t look quite right to me. That’s a very minor detail - I wonder if a little plywood bulkhead might do, instead of the centre frame – like the little cardboard bulkhead that was used in the model. Or perhaps a narrow thwart, with plywood knees below? Neither would take away from the over-all simplicity.

    Despite its stark simplicity, it is very pleasant to look at. The curve-top transoms and that little bit of rocker and sheer – it has style with a light touch. Maybe the best word for it is “cute”, anyway I keep going back for another look, and I am tempted to follow Arne’s example and try to knock up a quick model.

    The sail plan and mast placement needs to be worked out. When that detail is attended to then it looks to me like a very attractive proposition and the potential winner.
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  • 19 May 2021 02:44 | Anonymous member
    After-thought: Might have to think of a better solution for plugging the centreboard case if it is to be placed anywhere near the rowing bench. We don't want to be sitting on a wet sponge!
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  • 19 May 2021 09:51 | Anonymous member
    The thing I particularly like about this design is the way that the rowing bench ends amidships, not going right to the stern as on Bolger's Tortoise. So the rower can sit in two positions, for rowing one-up or two-up, but it's still possible to board by stepping into the centre of the boat. The design of the centre frame is good, too, These features might well be incorporated into other hull shapes.
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