|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.
|An outboard profile and plan view taken from Bertil Andersson's website. I'd 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!|
20½ foot.Length 6190, width 1800 mm.From Kalmarsund. Build in 1910's 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: -
|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!
Isn't it amazing to see what comes from a scheme to build boats in the desert?