Now, I propose again a further development of a short segment, already known from my clients in the balanced version with shaft 6.5 mm or 7 mm in diameter: SABER 80 is set for a shaft 7.5 mm, long 110 cm.

It comes to putting a new dress for an old thing, as is wont to do in the field of spearguns? A semblance of novelty or real technological evolution?
It was 2004 when, after studying experimental ballistic began with the filming of the shooting filmed from a remote eye connected to a Sony Vaio PC ( Milan company engineer Campana) I found that my spearguns , with shaft 7mm and after 2 meters of range , had a better performance compared to the same armament with rod 6.5 in diameter( rod 7 mm faster to end-range compared to rod 6.5 mm, see diagrams of the speed of rod depending on the range published in studies ballistic of 2004.

Who knows my pragmatic and scientific methodology as designer, will understand that it is underway a substantial move towards the launch of rods with greater inertial mass that guarantee better performance than spearguns armed with rods of small diameter. This year I started with the MEGA SABER 4, casting a rod 8 mm, shortly I’ll introduce SABER 100, armed with rod 7.5 mm. The goal of this project is to increase the range of the rod, maintaining stability and great precision of shooting.

Is simply the old gun which was mounted on the rod by 7.5 mm?

It’s a gun completely redesigned and prepared for even the most powerful engines of the simple double circular bands. They have been brought substantial changes to the stem so as to eliminate the problem of the rearing connected to the recoil of the stem, a limit which had previously braked any attempt to increase the power of shot of my spearguns and, consequently, to increase the mass of the rods launched.

Starting from the last version of the Saber 110, and then with the Mega Saber, I changed the shape and mass of the stem, and now these changes have been tried with success on shorter segments, therefore it is a new generation of spearguns.

That the launch of a rod heavier will be resolved simply by increasing the installed power in a speargun, is mere illusion! For some diameters of the shaft it is necessary to design the speargun from scratch.
What happens in the launch of a rod 7.5 mm, for example, with respect to the launch of a rod from 6.5 or 7 mm of If the engine is appropriate and can maintain the same speed shaft, increases the kinetic energy so the impact energy of the shaft on the meat of the fish!

The arrow of speargun, in the engineering discipline of Construction Science, is called, this occurs when the longitudinal dimensions are relevant to the cross. This type of rod / arrow, when it moves in the fluid medium is subjected to stress called < load on tip > (a stress that longitudinally compressing the shaft also tends to bend it). The arrow therefore enter into oscillation with respect to its center of mass dispersing energy and increasing hydrodynamic resistances (function directly proportional to the front section of the object in advance in the fluid medium. When the rod oscillates (usually in the vertical plane), increases the front section of the cylinder of fluid disrupted, in practice, we can also launch a shaft 6 mm, but when this oscillates, its fluid resistances will be like those of a stiffer shaft diameter bigger! In conclusion the rod is more rigid lower the fluid resistance, the greater its kinetic energy than even a rod leaner launched by the same engine.

It can increase the stiffness of the rod or, simply, choosing a steel more rigid, or by increasing the transverse dimensions (enlarging its diameter), therefore, increase the rigidity for geometrical reasons. The effect can have an origin different from that described above, due to the stress of the load on peak: the tipping up of the stem. The phenomenon is most evident in the filming of the shot at high speed showing the action of the end of the stem in the phase of interior ballistics when it rears up and finding the shaft that pioneered roughly half the length of the stem and urges it to flex. Even this thrust of the head of the speargun on the stem triggers a harmonic oscillation which is added to that produced by the stress at peak load, continues during the trip rod, dulling itself approximately after the first two meters of range. The phenomenon ballistic dissipative concerns only part of the exterior ballistics, however, that which takes place at higher speeds, thus more wasteful in terms of resistances.

A moment's thought: if you do not the stability of the stem during the shot, often increase the potential energy of the engine elastomeric results in large energy losses, large recoil, tipping up the gun, at the expense of accuracy. Technical considerations and hunting When fishing in rough seas, the long segments of spearguns are subject to large displacements due to waves and is extremely difficult to keep the gun in alignment target, then the segments which are usually more accurate shot than the short segments, on the contrary, they are imprecise and difficult to manage underwater. In the same sea conditions, however, I have experienced that even short segments in certain shooting situations are not stable and precise, also, often missing a few centimeters of stroke rod to catch the prey of large size. Some time ago, to gain in range using short segments so I tried to install more powerful engines, with the loss of even more destabilize the shot: burst errors!

The speargun is simple, practical and does not need to be distorted with casting powers that alter its stability. To function properly, each gun has a specific range in which the installed capacity can vary in relation to the mass of the rod and the mass of the drum, too powerful engines trigger ballistic phenomena that compromise accuracy. I took several years of practical research fishing-testing before understanding how change the design of spearguns. As the transition from project to the project , the first have not become obsolete, but continued to serve their users with satisfaction, even in this evolution in Saber , the Saber armed with shaft 6.5 and 7 mm remain current for fishing in the sea conditions: smooth and prey proportionate to the shaft from 6.5 to 7 mm in diameter.

For these considerations, the Saber 80 / 7.5 mounts a reel from the reel diameter of 80 cm, unlike the model for shaft from 6.5 / 7 mm that mounts a smaller reel (reel 60 cm in diameter). Not placing more in the segment of the speargun only for a fishing in the lower bottom of prey of modest size, I felt the need to increase the length of the line for the recovery of the fish. In this new version the Saber 80 approaches the performance of the segment immediately above: the Saber 90, then differentiating in the purchase of my models, now, it is good to keep in mind the innovation proposed by the segments in terms of ballistic performance.
A new application area for this short speargun, is also shooting in the fall making sure to cock the rifle with a third pass of terminal nylon: the greater inertia of the rod allows shots from the top down large effectiveness.

Thanks to the great handling and power shooting the Saber 80 / 7.5 is presented as one of the most versatile models for the ambush in the low seabed.