Tomba - All in One barrel sealing

[tromic]

I used slightly different knot than on the picture above:



and a constrictor knot:

 

[tromic]

Tomba - new names:
...

"S" type Tomba like Tomba650S is actually only one, for 6.5 mm shaft. It is not convenient to make it for larger diameter of the shaft. It would be too bulky-heavy (with the same cone angle-4 deg). It would be possible to make it but each diameter of the shaft would require different cone angle for the slider to maintain about the same length which should be pushed in adapter, and same OD of the slider, which is about 12 mm.

 

[tromic]

Stop ring on the picture is not very thin. It is 11 mm OD and 4 mm long.

Here the O-ring might be pushed in sealing position with the slider. O-ring is 16 x 8 x 4 mm for 7 mm shaft, so it should be squeezed to seal the 7 mm shaft.

 

[zmajmr]

[ame=http://www.youtube.com/watch?v=A4XrDJp1gv4]Tomba700 - YouTube[/ame]

 

[zmajmr]

[ame=http://www.youtube.com/watch?v=wRNP526xpxM]Plastic slider & how to tie knot - YouTube[/ame]

 

[tromic]

Plastic slider & how to tie knot - YouTube

 

[tromic]

This might be a better solution than a knot:

[ame=http://youtu.be/HiOzEELTWp4]Simple Splicing in Spectwelve Dyneema Core with Push Fids - YouTube[/ame]

 

[Vlanik]

This might be a better solution than a knot:

Simple Splicing in Spectwelve Dyneema Core with Push Fids - YouTube

I so fasten

 

[tromic]

I so fasten

How had you made a needle-tool? Have you a picture?

 

[Vlanik]

How had you made a needle-tool? Have you a picture?

medical needles for blood transfusion and needles for droppers

 

[tromic]

medical needles for blood transfusion and needles for droppers

Thanks, Vlanik! But you do not use line slider with your gun? Where do you use that loop on your gun?

 

[Vlanik]

so I fasten линь to harpoon

 

[tromic]

It is not a good idea to tie mono line to the Tomba700 slider using a knot. That would not be reliable or would be too tight on the neck of the slider so the slider would not slide smoothly. Maybe you might use a crimping tool with mono? My idea was to use a piece of deenyma (spectra) 1-1,5 mm and a mono after it.

 

[tromic]

I wondered which is currently the best vacuum kit for a shaft with a slider. I believed, based on my measurement, that it might be Tomba and I was right. An Italian guy (kalama at www.pescasubacquea.net - pesca subacquea: foto, video, prede, tecniche, apnea, attrezzature, sicurezza) did some tests with the kits he had on his guns, from Mamba, STC, LGS and found Tomba to be the best in shooting performance. This was one of his last comments on a forum:

"... ps attualmente la palma di miglio kit sottovuoto testato da me tra mamba, stc, lgs, va al Tomba"

I already told that Tomba700 was even better in performance that TombaF700 (free shaft Tomba). Not a significant difference, but was better. TombaF700 is more reliable than Tomba700, (it is more simple), and maybe easier to use.
My opinion is that the best and the most reliable free shaft vacuum systems (between STC, Evo-Air, TomabaF, Tovarich) are TombaF and Tovarich. TombaF is easier to maintain, to change O-ring in muzzle despite O-ring is deeper in muzzle.

 

[tromic]

This might be a new model Tomba700Ti. Without cone shapes, using titanium stop ring.



The idea is actually not new:
http://forums.deeperblue.com/pneuma...mba-all-one-barrel-sealing-21.html#post835956
#315



Just minor modifications. What I do not like is length of about 30 mm. More length, more drag. So Tomba700 might be still better. But I will know that only after measurement.

 

[tromic]

This might be an another version of Tomba:

 

[tromic]

Another possibility:

 

[tromic]

There are a lot of possibilities. Which one to choose? Which is the best?

 

[tromic]

I am not quite sure that this last transformation would work as supposed to.
How soon would the O-ring be pushed in sealing position? It should be pushed deeper by friction to the shaft and vacuum. Maybe some water might enter the barrel before good sealing happen. Also the shape is not very hydrodynamic. There are tiny steps on the back end.

 

[tromic]

This is similar to drawing before, but is more simple (one part less) and uses 10 x 6 x 2 mm O-ring instead of 11 x 6 x 2,5 mm. Metal ring would be made in titanium, 10 mm OD.