|  Dentex
Double Giman
The Double Giman system is a new system which allows you to use
two 16 mm bands on the Dentex speargun.
The design comes from the need to make the gun more powerful without
damaging its hydrodynamic profile.
In most cases, the presence of two bands in the same hole causes
them to overlap, the head is too large because of the big hole and
the adjacent part of the body gets modified. This heavily compromises
transverse movements and ease of handling.
In the Double Giman system, one 16 mm band runs in the head of the
gun, and two bands, tied by means of a dyneema tying, are inserted
in a small brass hole placed at a distance of 10 cm from the head
hole and at a higher position with respect to the first diagonal
band. The two bands, therefore, run one above the other, without
overlapping, and the overall volume remains the same as that of
a single band.
Furthermore, the additional band works with a reduced inclination
with respect to the barrel. In this way, losses of power, which
may derive from a too transversal thrust with respect to the horizontal
stroke, are avoided.
The installation of the additional band may seem complex and precarious,
but the opposite is true as it is easy and safe. The two pieces
of band are tied together by a 2 mm dyneema thread, which runs in
the small noose already made inside each piece of band - the noose
in the band and the tying at the end of the cone-shaped part of
the band do not need to be changed, since they are not subject to
wear and tear; on the other hand, the dyneema thread can be substituted
easily and quickly by simply tying a knot on each noose.
In order to make the loading easier, I have adopted a shaft with
pins. The additional band is loaded first, at the first notch; then
the main band is loaded at the second notch, by placing it temporarily
at the first notch to reduce the effort.
The sea tests showed that Dentex Double Giman preserves the hydrodynamic
qualities of the single band Dentex. You do not almost realize you
are using a double band gun. This, I think, is of utmost importance
to fish in seas where powerful, quick, easy to move and to handle
guns are needed to follow and aim fish which is getting more and
more distrustful, 'experienced' and quicker. The Dentex Double Giman
shoot - with a 6.5 shaft - is lightening, powerful and precise.
The recoil is cushioned thanks to the tested Dentex design. Furthermore,
to have a better grip on the handle, it is possible to make a comfortable
left and right handle, a design used in 2002 in the first Dentex
prototype.
The Dentex gun with Double Giman system becomes, then, two guns
in one, because, by taking out the additional bands, the speargun
can be used with a 19 mm main band. In this way, different fishing
requirements and personal preferences can be met. Furthermore, the
balancing system of the gun allows you to set the gun according
to the gear.
The mechanism of line release works perfectly with two line turns.
The Double Giman system is made on 100 and 110 size.
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