[0001] The invention involves one under sailing surfing catamaran of equal or different
length of the hulls,each with an arched, out by the floorboards most crossbended,
deck and with,with about the same cross-bendings,two floorboards and one bottom, placed,two
floorboards and a bottom which meet in a sprayedge,with floor boards with hights about
the half of a hullbeam and with hulls separably connected by,in the main thing,two
crossbeams.
[0002] The above described catamaran has in waves not gentle movements,as catamarans which
in vertical underhullscrosssections at the keels have tangents between which are bottomangles
between 60° and 100°. This boat will be more slowly than a surfing boat by a,above
a certain amount, of the same influenced force of movement.
[0003] The catamaran regarded in the invention is characterized by,that both the two hulls
are divided in a superhull and a underhull by one,symmetric about a lengthways of
the hull going plan with a heeling about 25° to vertical,in the suit beeing,dividing-ribbonsurface
going along the catamaran inner facing floorboardsgunwale sloping down along the horizontal
curbed bow and flat stem,until it follow the outer facing floorboard cutting the bottom
and which in that way maded assemblyribbonsurfaces for the whole boat are congruent
and two and two are heeling against or from each other,and the two superhulls can
be fixed to the underhulls with bolts,spindles or other means,in two different ways,thus
producing two different types of catamaran. A catamaran for surfing is achieved by
connecting the two superhulls to the underhulls,so that the latter have gentle curved
horizontal contactsurfaces to the water. A catamaran for sailing in waves is achieved
by connecting the superhulls to the underhulls, so that the latter have V-shaped contact
with the water.
[0004] Consequently, one can choose to sail surfing or buoyancysailing.
[0005] The drawing shows different parts of the catamaran regarded in the invention.
Fig. 1 shows the superhulls 1 and 2 above the assembly-ribbons s.
Fig.2 shows the catamaran from the bow with the parts 1,2,3 and 4 assembled.
Fig.3 shows the parts 1,2,3 and 4 assembled for sailing in waves.
Fig.4 shows the parts 1,2,3 and 4 assembled for surfing.
Fig.5 shows a cross-section through a spindle connecting the assembling surfaces.
[0006] 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 can be replaced by the cross-section of
the other underhull shown punched, because it is a mirror image of the other about
the middlenormal-plane to the dividing ribbon-surfaces, with the keelplane k
ø at a right angle to the cora k.Because a and b are also on the congruent assembly-ribbons
outer lines,the superhulls and the underhulls will meet at these. A cross-section
in the hull in á and b́ 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.
[0007] Other form-giving for the hulls and theirs mutual length-placings are out of the
scope of the present patent.
1. Catamaran for surfing-or buyancysailing, characterized by, that each of the two hulls is divided in a superhull (1 or 2) and a underhull
(3 or 4) of one,symmetric about a lengthways of the hull going plan with heeling u=
25° ± 10° to vertical, in the suit beeing, dividing ribbon-surface and which in that
way maded ribbons are congruent and two and two for the whole boat are heeling against
or from each other and with bolts or other means one can fix (1) against (3) and (2)
against (4) or (1) against (4) and (2) against (3).
