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Geoff with some of his students. The beautiful boat they have built, and are displaying here, is an Iain Oughtred-designed John Dory |
Imagine what sorts of problem-solving issues have been dealt with by the high school students who built this boat |
Another view of the John Dory as she sits in the school foyer, displaying the complexity of work required from a young team - art, engineering, chemistry, arithmetic, manual arts, project management and housekeeping to name a few. |
There are two problems: -
- there is no table-of-offsets;
- Geoff wants to build in glued lapstrake and therefore hopes to minimise reverse curvature in the hull to simplify construction.
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An outboard profile and plan view taken from Bertil Anderssons website. Id like to show you the body plan so as to give some indication of the extreme reverse curvature, but I do not want to show material without permission. However, you can take it from me - this is a curvatious boat in the extreme! |
LotsbåtSkum
20½ foot.Length 6190, width 1800 mm.From Kalmarsund. Build in 1910s by Pelle Fräsare in Kalmar, Småland. Completely in oak.
Wondering whether my friend Mr Leedham had handed me a poisoned chalice, I gave it my best shot, and here are the results: -
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These are my lines incorporating many changes from the original boat (which I commend to you, with the suggestion that you purchase plans from Bertil Andersson). You can see that cross-sectional reverse curvature has been reduced greatly, particularly amidships and in the run, but that the profile and plan have remained in the spirit of the original. This will be a lighter boat, reflecting her changed construction method, but she retains the character of the original with minimal changes. |
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjoaCw4Aj7ogTSD77pdqC-juZxW1WoRw0Z9it5C32FUmW3ZasXuFnthGLpxPqpa8hj6w3d2f_IvJzbnsdeiCqhUVIXTaQ6BNEpGS7ZCT_SiUCC72M54NyBJ-PlTkc1TGslfUManTqfayCqH/s320/Lotsbat+Skum+C+Keel.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhcD8fdGwvVV-55YakxEDe_b8Sp55u0siAYJMGOQJOxci4WzEgN1XrXlmT0VC-Yc4DZcIpnYu1amatADakNJlLf7FIyfd85xjs093Hi7E7RS_-H3ycWrzDA2ATHzsmjGvEQl6JLnmP9xio9/s320/Lotsbat+Skum+C+Keel1.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3DMm6Qi4-gq_urm-OFtb9jRLZWFdCLLRZZ2ZzXxgUlDrE7s6_-llgQ59QFJ1RuWXpMG1RuaaeRkT305ENa5PiT-BxF2Tyy1zyJANGvfvhtzZIcOyd4gtDJHury1El7Hf-i-UoZW08EfC2/s320/Lotsbat+Skum+C+Keel2.jpg)
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The above renderings show the modified Skum at 6.197m x 1.836m x 0.525m draft ( 20 4" x 6 3" x 1 8-1/2") at a displacedment of 1041kg (2,290 lbs) |
In addition to the lines drawings and off-sets, I have supplied Geof Leedham with a fairly detailed scantlings schedule, which I may publish if there is interest, and if Geoff agrees. He has paid me some money, and I need to be sensible with what I publish in case he refuses to take me for a sail!
Isnt it amazing to see what comes from a scheme to build boats in the desert?
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