Because
a traditional speargun, when fired, rotates around the 'grip' or handle
of the diver, upward recoil is resultant reaction of the tip of the
gun, causing a 'kick-up' in the gun. This has a tendency to produce inaccuracy
in the spearshot. Because fish are generally longer than they are tall a
shot may be over the top of the fish. This is a known problem when a diver
shoots at a fish that is too close. Shaft drop due to gravity, may fortunately
compensate for this 'kick-up' type error. At a certain distance the arrow
may be where the spearfisherman believes it should be.
To reduce this 'kick-up', European gun designers have been elevating the trigger mechansism in the vertical plane. The C4 Carbon fiber molding company produces a very fine example of the proper use of molded technology to elevate the hand grip. The vertical position of the hand grip is elevated to reduce 'kick-up' See their website and look at this speargun
http://www.c4carbon.com/inglese/sub/frame_sub.htm
Giorgio Dapiran on the webpage, http://www.chasse-sous-marine.com/magazine/tecnik/dapiran_recul.htm shows the reaction of 'kick-up' in his sketches.
As a solution to the problems of 'kick-up' for these rear handle spearguns I would propose a TRANSVERSE HANDLE made from molded carbon fiber like the C4 company uses. The mechanism of holding the spearshaft is undefined. The transverse handle is the concept I want to propose to you. Please see the image below.
To reduce this 'kick-up', European gun designers have been elevating the trigger mechansism in the vertical plane. The C4 Carbon fiber molding company produces a very fine example of the proper use of molded technology to elevate the hand grip. The vertical position of the hand grip is elevated to reduce 'kick-up' See their website and look at this speargun
http://www.c4carbon.com/inglese/sub/frame_sub.htm
Giorgio Dapiran on the webpage, http://www.chasse-sous-marine.com/magazine/tecnik/dapiran_recul.htm shows the reaction of 'kick-up' in his sketches.
As a solution to the problems of 'kick-up' for these rear handle spearguns I would propose a TRANSVERSE HANDLE made from molded carbon fiber like the C4 company uses. The mechanism of holding the spearshaft is undefined. The transverse handle is the concept I want to propose to you. Please see the image below.
Please keep in mind that this is a concept drawing and
it has yet to ever be produced by anyone (to my knowlege). Many practical
details have not been developed, but the the elevation of a transverse grip
and approximated location of a horizontal trigger position are the elements
you should consider.
This is a perfect design to be produced in carbon fiber.
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Note that a secondary handle probably should be included
to give vertical control. Main handle is operated by right hand with trigger
horizontally. Left hand is on an offset handle mounted to the left and back
from right hand. The gun needs to have both hands used for better control.
Right arm is kept straight in firing and aiming to stabalize recoil. Left
hand is used to track the fish in a vertical direction and is not the primary
absorber of recoil.
This is a perfect design to be produced in carbon fiber.
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