150cm speargun with 200x8mm shaft can I use 2x19mm or 2x18mm?
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Your gun is inaccurate because it overpowered, and it probably has less range than it could have since you can't stretch those thick bands far enough so that they can accelerate the shaft sufficiently before they have shrunk back to their unstretched length. In the US, most big guns have traditionally been powered by multiple 16 mm bands stretched to 350 percent, but there seems to be a change in thinking lately. Some gun makers are recommending using 14 or 14.5 mm small interior diameter bands (The normal ID is 2 mm, but these have a 1 mm hole in the middle) and then stretching them as much as 360 to 380 percent. You don't get as much of an initial jolt to cause recoil, but the band gets to act on the shaft over a longer distance before it is fully relaxed.
I don't have much personal experience with this idea but I'm in the process of trying it out. I recently purchased an Abelian 120. It has 123 cm of band stretch and shoots an 8mm x 150mm shaft. Based on experience with my American guns, I would have thought that this gun needed three 16 mm bands to push that shaft. But the gun came with two 14.5 mm small ID bands stretched to about 370 percent and seems to be very accurate and can shoot fish out to about 18 feet (6 meters). There is a guy in Florida who does extensive pool testing of guns, and he said that adding a third 14.5 mm band to this gun actually resulted in decreased range and accuracy. It doesn't seem intuitive, but maybe its true. He also reported very poor results with guns using the very thick 18 to 19 mm bands typically furnished with Euro guns.
I have an 57.5" Wong gun that I've always used three 16 mm bands on. Based on a recommendation from a guy who has a similar gun, I recently put on two 14.5 mm small ID bands stretched to 360 percent. I'm afraid I haven't found a pool to test it in and I haven't even shot at a fish, but when I test fired it at a piece of kelp a few days ago, the shaft sure did seem very fast and I had negligible recoil. Maybe I've been doing it all wrong.
BTW, a 200mm shaft sounds very long for a 150mm gun. Do you have a lot of shaft overhang? A shorter shaft would be lighter and reduce recoil.View attachment 42013
in the aballen how long the overhang out of the stainless muzzle?does it matter if your spear +/- 10 cm from that length ?
My Abbelan shaft has 23 cm of overhang. I doubt that it makes much difference. For instance, Riffe sells his guns with shafts that have huge overhangs, but a friend of mine uses a Riffe Island with a shaft so short that the slip tip adapter is barely off there muzzle, and he does very well. Its at least partly a matter of personal preference and what you are used to.View attachment 42467
I guess I mentioned this in another thread, but I'm not familiar with the term "quenched steel." Is that what I call a South African plated shaft?
If so, I've never noticed any difference between the plated shafts and my stainless shafts in terms of whipping.
I do recall that the guy who imports Abbelan guns told me that he got them without shafts since Euro stainless shafts "sucked." Maybe that's what he meant. My American stainless shafts don't seem to have a whipping problem.
you are right and the guy who imported is smart ,why its whipping and easily get overpowered even they advertising its super hard this I don't know ,in abellan when pulling the band do u notice the reel line is squeezed between the band and the muzzle ? in pictures is clear ,if so does it affect moving of the spear ?I guess I mentioned this in another thread, but I'm not familiar with the term "quenched steel." Is that what I call a South African plated shaft?
If so, I've never noticed any difference between the plated shafts and my stainless shafts in terms of whipping.
I do recall that the guy who imports Abbelan guns told me that he got them without shafts since Euro stainless shafts "sucked." Maybe that's what he meant. My American stainless shafts don't seem to have a whipping problem.