(57) The catamaran has two hulls shown fully drawn on fig.2. On fig.2 it is shown that
a fully drawn crosssection of one underhull (3) can be replaced by the cross-section
of the other underhull (4) shown punched, because it is a mirror image of the other
about the middlenormal-plane for the dividing ribbon-surfaces, with the keelplane
kø at a right angle to the cora k.Because a and b are also on the congruent assembly-ribbons
outer lines,the superhulls (1) and (2) and the underhulls will meet at these. A cross-section
in the hull in á and b′ show that a correct hulldesign and parallel keels can be achieved
for the V-shabed bottom with a rounded bow. For the surfing hulls is α different,but
close to β which make a slight unimportant asymmetric ξ of the bottom.A stippled curve
is symmetric about the above mentioned middlenormal m, in order to achieve an evenly-drawn
line-design of the longest hull astern when exchanging the underhulls.
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