>So if you own a recent boat your estimates are very likely >correct.

It is a '97 boat. I am quite sure that hull weights are not correct by 1-3kg each. I just did not have a good weighing scale.

>However a couple of figures are "strange":
>1) you state that the stbd centerboard is Kg 4,80 and the
>port centerboard is Kg 3,40. Is there any particular
>reason to explain the difference? I cannot believe that
>Marstrom builds foils so differently.

Originally the boat came out too light. In order to avoid putting so much additional weight (lead) under the main beam, the previous owner decided to fill up one of the boards with epoxy.
That's causing the weight difference.

>2) you state that the boom weights 1,70 Kg. Does this
>figure refer to the bare section? Even in such case the
>section weights only around 0,70 Kg/m. Hence a "wall"
>thickness of only 0,15 mm. May you confirm? [/quote]

The boom is a cylindrical, circular shape. Outer diameter is 45mm. Wall thickness about 1mm (maybe 1.5 ?), length is 2340mm. Material is aluminium. Weight also includes cleats and blocks for mast rotation outhaul.