- Jul 30, 2008
You can see the plug and rear bushing here where they are screwed together for storage, they both having the same screw threads. The plug male, the rear bushing female.
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After the shot all annular pistons are leaning on their respective rear pressure bulkheads, so the water will be eliminated from the receivers. The axial reels have revolving covers, so after a dive any water inside them will drain out though the various gaps. The plastic front line wrap hooks just slide into the slots in the covers when you are fitting the reel covers. These revolving titanium covers can be removed by unscrewing the plastic nose cone as the titanium reel body is part of the front pressure bulkhead and the nose cone is what retains the cover in place. The covers can be rotated to wind line on the “spools” as the line passes up through a vertical (effectively radial) hole in the plastic hooks. Personally I find the line wraps OK on the front and rear hooks, so don’t plan on using the reel functions. It really depends on the depth of the water you are hunting in and if your prey holes up on the bottom and you need to retreat to the surface before descending again to finish your victim off, then you need more line on the gun to reach to the bottom.How is the issue of pumping water remaining in the barrel in the transverse pockets resolved?
Because any water injected into the front "Small" receiver in the “Combi” gun configuration is lost once the spear tail "O" ring passes the unsealed join in the two inner barrels this would mean that some of your loading effort is wasted, but this only applies to the initial spear insertion. Once the spear tail moves into the rear inner barrel you can push and pull the spear and inject more water into the gun. For example you could just use the last third of the inner barrel and three strokes would be equivalent to one full length inner barrel stroke because the spear tail valve allows more water in but does not let it out. When the “Combi” gun shoots the injected water can only go out the inner barrel mouth as bar the inner barrel the connection between the two receivers is sealed.The discrepancy between the pressure equality in the two pneumatic accumulators can lead to an increased internal resistance to the movement of water in the well and a loss of efficiency!
If you hold the gun vertical with the muzzle pointing upwards while underwater then the inner barrel of the gun will fill with water before you insert the spear. A low power shot with only a partial spear insertion should get any remaining air bubbles out, or even a "dummy" shot with the spear pulled out. On the “Aquatech” guns you can open the rear hydraulic locking chamber and by pressing the shaft into the gun this will send water straight out the other end of the gun, thus getting rid of any air bubbles, however on these mechanical release valve operated guns there is no rear water exit. The rear handle is easy to screw off, so you could assemble the rear of the gun underwater as the releasing valve tail is first trapped in the handle and then you screw it onto the gun which pushes the releasing valve into the back of the inner barrel. Even a partial undoing of the rear handle may do the trick, but I have not tried it.The translator does not translate correctly! I didn’t mean pumping out water, but getting air out of the barrel and pockets before loading! Hydraulic systems need bleeding to remove air before operation!
This is how the gun shoots as compressed air drives the annular piston rearwards as a result of the releasing valve uncorking the rear of the inner barrel thus allowing water under pressure to escape down it. Because water is incompressible the water has to speed up as it moves into the smaller diameter inner barrel which means it travels much faster than the annular piston does and therefore can propel the spear at high velocity.
View attachment 57456
This is how it works, I have left out the safety cam in order to make the drawing easier as it has been spliced together from a couple of different diagrams. The trigger blocks the line release lever which in turn blocks the rear end of the releasing valve. This feature is what makes this gun different from most other guns of this type and is quite ingenious.Pete can you explain how the valve is released after pulling the trigger? In the pictures shown earlier, this is not seen well.
Thanks Pete! Actually the safety cam makes me the difficulty to understand it clear because it seems to me that it prevents the adequate moving of trigger lever. Now from your drawing I can see that that moving is actually very small, just to slip from the line releasing lever bottom.This is how it works, I have left out the safety cam in order to make the drawing easier as it has been spliced together from a couple of different diagrams. The trigger blocks the line release lever which in turn blocks the rear end of the releasing valve. This feature is what makes this gun different from most other guns of this type and is quite ingenious.
View attachment 57459 The shooting line then pulls the line release lever forwards from the position shown above so that the line can easily escape from the tip of the lever. When you reset the releasing valve by pulling the line release lever backwards this presses on the releasing valve tail driving the valve body forwards to once more seal off the end of the inner barrel.