Tomba - All in One barrel sealing

[tromic]

What you are really talking about is the shaft bowing and thus slightly changing approach angles as it passes through the muzzle restriction imposed by the stop ring and slider. Now everything is much clearer as muzzle loading the shaft when not parallel to the muzzle is a completely different problem and can result in bending the spears and maybe damaging the gun, something that beginners are capable of doing when their attention is not focused properly on the task.

On a standard wet barrel gun the stop ring and slider are not pulled tightly back into the muzzle, they can rock and move forwards if the shaft bows and changes its angle while entering the muzzle, plus there is a small amount of lateral play in the seating recess, whereas in the Tomba system they are held back in their seating recess, so they cannot tilt or move to accommodate the change. I had not thought of that being a problem, but now you have a clever solution to it and a vacuum indicator as well which is very good, in fact with a discernable travel distance it would be a very good indicator if you could detect the change in position by just looking at the muzzle.

Thanks to Pete for the answer! I guess it was not so clear to all with my English!

 

[zmajmr]

 

[Crustyfish]

Hi Tromic

I've recently come over to the dark side as I needed a gun small enough to take on a motorcycle camping trip, and bought a Seac Caccia HF 90cm. The short story is that I love it as it's so easy to dive with and I've taken a pile of fish, so it does seem to work. My question is if you make a dry barrel kit for this gun that uses the standard 7mm stainless spear? After reading this thread it sounds like these kits make a worthwhile difference to pneumatic guns so I'm very keen to try it out.

Carl

 

[tromic]

Hi Tromic

I've recently come over to the dark side as I needed a gun small enough to take on a motorcycle camping trip, and bought a Seac Caccia HF 90cm. The short story is that I love it as it's so easy to dive with and I've taken a pile of fish, so it does seem to work. My question is if you make a dry barrel kit for this gun that uses the standard 7mm stainless spear? After reading this thread it sounds like these kits make a worthwhile difference to pneumatic guns so I'm very keen to try it out.

Carl

I am not sure, maybe Marko (zmajmr) already had made a kit for spear gun like you have. Send him a PM.

 

[zmajmr]

 

[povlsen]

Looking very good, can't wait to try it out on the HF. Thanks for the superb service Marko!

Michael

 

[grantl]

I am not sure, maybe Marko (zmajmr) already had made a kit for spear gun like you have. Send him a PM.

I had a kit made for my Caccia 115 - definitely worth doing. The difference in performance is incredible and Markos engineering is top notch

Sent from my D5503 using Tapatalk

 

[povlsen]

Hi again. I took the liberty of taking a few snapshoots in the basement of the newly transformed dry muzzle wonder - Cyrano EVO HF - Tomba style. The fit was spot on, and the scratches that are visible are all my own (wrong)doing. (bad tool and being too bloody impatient)

Thanks again Marko - great job!
Kind regards Michael

 

[Jegwan]

Looking awesome Povlsen! - probably the first dry barrel Cyrano Evo HF in the world! Congrats!

Jégwan

 

[zmajmr]

Hi again. I took the liberty of taking a few snapshoots in the basement of the newly transformed dry muzzle wonder - Cyrano EVO HF - Tomba style. The fit was spot on, and the scratches that are visible are all my own (wrong)doing. (bad tool and being too bloody impatient)

Thanks again Marko - great job!
Kind regards Michael

Man pictures look like you are professional photographer , very cool. Hope gun and kit will serve you well.

 

[zmajmr]

Look like brand new to me

 

[povlsen]

Look like brand new to me

 

[povlsen]

Semi pro at best - thanks. You are free to use the pict. for promo of your products! (let me know if you want high-res, then I will email them to you!)

 

[zmajmr]

Semi pro at best - thanks. You are free to use the pict. for promo of your products! (let me know if you want high-res, then I will email them to you!)

Thank you, I posted on couple of forums already, guys from Spain seams to like them. They are quite OK in this resolution.

 

[zmajmr]

 

[povlsen]

Hi Guys,
Took the Cyrano/Tomba out for a spin - what a spin it turned out to be. I nailed 3 seatrout from 1,3 kg. to 6,6 kg. Two of these fish at close to max distance (3 line loops) and the spear penetrated like cutting warm butter.

 

[foxfish]

Tasty looking fish!

 

[tromic]

Maybe there was already somewhere similar image, but here is how could be the shaft loaded in water, with Tomba kit. Shaft should be filed on one side to be as on image, to allow water to pass under the O-ring while being inserted in muzzle.
Shaft should be inserted into the muzzle together with cone ring, O-ring and the slider. After that holding the slider in muzzle, preventing it from moving forward during pushing in the shaft, shaft should be pushed in to make contact with piston. From that moment loading can be proceeded as usual.

 

[popgun pete]

If you want an escape path for trapped water in excess of muzzle capacity at initial loading then why not return to the covered relief port idea? You only need one port in a groove encircling the muzzle at mid-body and this groove filled with an external "O" ring or a rubber ring of rectangular section that lies flat over the port. In the "Salvimar" and "Taimen" systems (and some others using a special seal with a lipped edge rubber nozzle) the vacuum seal can momentarily open outwards with excess pressure to prevent a hydraulic lock, but an "O" ring cannot do this at the muzzle entrance or the vacuum seal will be broken and water may rush in during the remaining loading action.

 

[tromic]

If you want an escape path for trapped water in excess of muzzle capacity at initial loading then why not return to the covered relief port idea? You only need one port in a groove encircling the muzzle at mid-body and this groove filled with an external "O" ring or a rubber ring of rectangular section that lies flat over the port. In the "Salvimar" and "Taimen" systems (and some others using a special seal with a lipped edge rubber nozzle) the vacuum seal can momentarily open outwards with excess pressure to prevent a hydraulic lock, but an "O" ring cannot do this at the muzzle entrance or the vacuum seal will be broken and water may rush in during the remaining loading action.

I never left that idea of covered relief port. But I do not want to make existing closed (sealed) muzzle more complicated that it is now. I usually just lift the gun in horizontal position above water surface, after inserting the shaft in muzzle, and after some water is drained out push in the O-ring using the slider. But with use the gun in scuba, when under water, this idea having the shaft end filed as on image, might be a soultion.