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Tromic I meant to ask if you had a good holiday?
I will also be interested to see your airbalete Tomba version, someone else was asking if you made one on another thread....
The ability to seal both the shaft and muzzle against water intrusion with a single "O" ring is a very good idea, however it does rely on that "O" ring staying put while the shaft is being pushed down the inner barrel. If the spear is stopped momentarily and allowed to come forward slightly during a pause in loading then it can dislodge the "O" ring and therefore result in water being sucked into the inner barrel. This is a potential problem with all vacuum barrel systems using a sealed slider and has been mentioned earlier in this thread, but I am raising it again for the following reason. It occurs to me that this dislodgement could be prevented by restricting the slider from moving and thus immobilizing it in the muzzle opening during loading effort on the shaft. On tromic's latest design this could be achieved by inserting the shaft in the muzzle and wrapping the shooting line on the gun's line hook system before pushing the shaft in, however this would not be so easy to do on a longer gun due to the weight of the long shaft sticking out of the muzzle and being unsupported. Rather than use the tension in the "pre-wrapped" shooting line, or tensioning it up with the reel if one is fitted, it may be possible to temporarily "lock" the line by throwing a loop around the post of the front line hook and then holding the line immediately behind it firmly against the barrel with the hand that is holding the front end of the gun. The type of shooting line used will determine how effective this "temporary hitch" method is as monofilament is not as compliant as braided lines in tightly wrapping around smaller objects.
Tromic, your Tomba kits look awesome!
STC X-Power has a much thicker rubber piece inside the muzzle (no o-ring on the shaft) so if you load the shaft and it comes out a bit, you don't have to worry about water entering the barrel. It might be similar to the Tovarich concept, but I've never actually seen it. The Mamba also had that problem where you have to push the shaft all the way in with one motion or water will get sucked in if the shaft comes out just a little bringing the o-ring with it.
You guys have a lot more info about the dry barrel system and I've learned a lot from you the past years. The only source for the larger/thicker o-ring for the STC is from STC, but it is quite easy to service. The cool thing about the STC system is that you can remove the very tip of the muzzle without letting out the air in the gun to check out the o-ring or replace it and you can change only that part of the muzzle to allow different size shaft diameters of 6.5, 7.0, or 8.0mm. And you can remove the tip to allow wet or dry barrel usage while in the water quite easily.
STC also has a very aerodynamic shaft tail made out of titanium now (the previous ones were made out of a softer metal so the would break if you loaded the gun at too high pressure) so you can choose between free shaft with mono tied to the shaft or use any slider ring without the o-ring on the outside which actually makes the shaft more aerodynamic that using Mamba.
Hey Foxfish! It was you who got me to the darkside a few years back when Mamba was all the rage! Yeah, the STC is costly - Euro100 not including shipping! But I like the system better than the Mamba and it was too difficult to get any service from Maorisub.
Tromic, you have much more knowledge than me about pneumatic guns and I really don't know much about wet barrel. The Airbalete 110 is the only wet barrel I've used. I got the original Mamba 90 and 110 directly from Maorisub and converted my Cyranos and Sparks directly to Mamba and X-Power without using them wet. But I do like to change between 6.5mm and 7mm shaft with my Spark 110 and when using the Mamba, I had to let out the air to change. But with the STC, I remove the muzzle tip and change to the other size and I'm good to go.
Sorry to be talking about all this other stuff in your thread. I'm excited to see your dry barrel conversion for the Airbalete and can't wait for Don Paul to receive it and put it to use!
Thanks, Peter. Nothing to add. I am waiting to send a kit to Don Paul, so he could test it with his Airbalete 110 in real conditions. He hasn't confirmed me his address for delivery yet. I suppose he is not at home.
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