experimental seac

[Adrian68]

Hi everyone, I purchased a new pneumatic gun a seac asso 90 for experimentation. The mass of the 8mm stock spear, head ,spring and slide ring was 370 grams . I had a spare chromed and threaded 7mm high carbon spear for my usual use cyrano 1100. Both ends were docked, a taper suiting the seac piston ground and a new flopper attached. A 2.5mm spearline hole was drilled 170mm back from the flopper. 1.7mm mono was passed through said hole and crimped back onto mainline, making an 80mm loop length. Total weight , 318 grams. Also, I machined and glued, a delrin 7mm sleeve to reduce the muzzle slop of the spear. This blew out on the second shot. No loss . I was interested to see this arrangement of slideless thinner spear on accuracy. The full range of the above from muzzle to spear tip was 4.8 metres. Results- (target- a golf ball size piece of shale in a sandy bottom 3 metres from muzzle) first shot hit it, second, third and fourth shots either hit it or were extremely close. I also noted the gun was much quieter. I had one tangle, I had crossed the lines when going from muzzle to line release. I thought I would try it anyway. Yep, tangle . The spear was very fast to the end of its range. An interesting experiment. I will try a stiff 1.5mm dyneema that is dipped in molten candle wax next. Cheers, Adrian.

 

[tromic]

If your new spear is 318 g and the old 370 g you should lower the pressure to 318/370 = 0.85 of pressure for 8 mm.
Delrin sleeve, glued, can not withstand the pressure of water escaping from the muzzle forward.
You would have still better performance if you were using 1.1 mm Dynema.

 

[vrokhlenko]

Hi everyone, I purchased a new pneumatic gun a seac asso 90 for experimentation. The mass of the 8mm stock spear, head ,spring and slide ring was 370 grams . I had a spare chromed and threaded 7mm high carbon spear for my usual use cyrano 1100. Both ends were docked, a taper suiting the seac piston ground and a new flopper attached. A 2.5mm spearline hole was drilled 170mm back from the flopper. 1.7mm mono was passed through said hole and crimped back onto mainline, making an 80mm loop length. Total weight , 318 grams. Also, I machined and glued, a delrin 7mm sleeve to reduce the muzzle slop of the spear. This blew out on the second shot. No loss . I was interested to see this arrangement of slideless thinner spear on accuracy. The full range of the above from muzzle to spear tip was 4.8 metres. Results- (target- a golf ball size piece of shale in a sandy bottom 3 metres from muzzle) first shot hit it, second, third and fourth shots either hit it or were extremely close. I also noted the gun was much quieter. I had one tangle, I had crossed the lines when going from muzzle to line release. I thought I would try it anyway. Yep, tangle . The spear was very fast to the end of its range. An interesting experiment. I will try a stiff 1.5mm dyneema that is dipped in molten candle wax next. Cheers, Adrian.

1) Delrin is practically non-glueable
2) 2.5mm spearline hole is too big as well as 1.7mm mono. I'd use no more than 1.5mm mono at most
3) Unless you put a chamfer on the both sides of your spearline hole I am afraid the line would be eventually damaged
4) Interesting that the accuracy was not compromised

 

[ele5122]

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[popgun pete]

If you use the search feature then you will find these aspects have all been evaluated before, different spear and shooting line diameters, etc.