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You fellas are correct, my gun is only SL55 currently with standard 8mm cressi spear. I have just ordered the Tovarich kit in 13 x 7.14mm (9/32) and I'm in the process of getting some custom spears made with line attachment as hydronamic as possible. SS spears in imperial measurements from the USA are much cheaper than metric ones in Australia.
I use the gun primarily for crayfish but still have to be able to nail a decent fish when I peak around a bombie and there's a big coral trout staring at me. It was a bit of a compromise, getting a gun short enough to reach around in holes and up under bombies, yet have enough grunt to nail a fish when required. The gun puts the spear straight through a trout out to about 2.5m but they have soft skin and small scales. The spear won't go through a parrotfish or bluebone at that range though. They have big tough scales. Mind you my tip is a bit blunt from shooting crays in the rocks.
I went for the SL55 because I figured that i could get it to be effective out to about 3m by using a dry barrel (am I wrong?). This is plenty of range for the type of hunting I do. The visibility is never too good anyway. If I want to catch big pelagics I troll a line out behind my boat. Likewise if I want to fill my big esky with reef fish I through in a handline.
But if I want crayfish...........................
The diving is also quite adictive. Last weekend my 8 year old daughter and I had a huge manta ray hang out with us for about 20 minutes. It got close enough to brush my daughter's leg. She was a little frightened until she found out it was nemo's teacher : )
I'm sure the Tovarich and smaller spear without slide rings will increase speed. I'll probably drop the pressure back to about 30-35bar after.
Cheers,
TJ
Just guessing here but I think you may have the wrong gun for the job and no amount of pumping up the pressure will make it do what it's not in its nature to do.
Dave
Hello Ulysses.
My opininion is a bit like yours, about the length of the gun, but not completely , for some different reasons.
First, you are right, "barrel-sealing-kits' are more efficient on longer guns. Just because, I think, the column of water to expell is longer for the same diameter, on long weapons. But this doesn't mean there will be no improvement, but just less improvement..
Second : There is a test on the Maori site, and a test by the engineer I spoke above, (again in Italian, sorry, but after all, they are the makers.) that shows that the speed of the shaft, with a 70cm gun, is good at 4 meters. Precision seems nice too. And all this with a 6.5mm shaft, speed conservation will be better with a 7 mm one.
Third : I think a 55 cm gun, which will push strongly the shaft on 50 cm, could be tested with an 80 cm shaft or even a bit longer. It will become front-heavy : a small wooden horizontal stabilizer can improve this.
Last thing : the arrow must be guided by the line-drag. When the shaft goes out of the gun, the line must be installed properly, to act as an axial stabilizer. It must be just behind the shaft, not laterally positioned.
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