Building 10:1 Model

1:10 MODEL

 To be sure no error has crept in due to the re-design of the bulkheads I built a 1:10 model in order to survey my changed drawings.

 

Re-Construction of Bulkheads Finished

All bulkheads had to be re-constructed in order to increase the headroom.
The work has been finished and a changed table of offsets has been calculated.

MODIFICATIONS

The original Dudley Dix design of the DIDI23 was altered in order to gain freeboard and headroom. The freeboard was increased by 215 mm by inserting an additional stringer below the sheer strake. The cabin headroom was gained by steeper cabin walls. The cabin edges as well as the cabin chines were kept unchanged (indicated by the dashed lines 1 & 2). The gained headroom is about 360 mm. In order to keep the beam unchanged too, careful modifications of almost all bulkhead shapes were required.

The Decision has been - Ply instead of Alu

I am convinced by Dudley Dix's designs. Today I ordered drawings for a 23 feet  keelboat design with vertical dropkeel. The Didi 23.
I did hesitate a while because of the quite low cabin headroom of 1.3 m.
But then I decided to increase the headroom to 1,65 after consultation with Dudley Dix.

Wood versus Aluminium

The last time I was looking for alternative designs and found an interesting article about building a 12m sailing yacht from plywood. The article was written by Prof. Dr.-Ing. Günter Grabe from the University of Applied Sciences in Kiel, Germany.
Building a 12m Sailing Yacht from Plywood
The article describes construction and strength of the sailing yacht "SEQINEQ", a Dudley Dix design based on the Didi 38/40.