Hatsan Jet I/II Discussion

[ModFox]

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I am mainly interested in combining 2 Jet cylinders to make a longer single cylinder. The proper double male connecter should do the trick. Longer tubes would give support for an fx slug liner, which this needs for slugs for sure. Yet, before this I was looking for a smaller pcp tube applicable to true single hand pistols and I hereby direct anyone who doesn,t yet know to the new Velox, by Hatsan. Pretty sure everyone wants one. That tiny tube has countless uses.
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The Hatsan Jet 2 already has 2 tubes (80cc), one next to another.
What would you gain by connecting 2 tubes the way you want?

You can't reload tubes on the Jet 2. When you're out of fuel, you absolutely have to use a pump or compressor. Example... on very long treks, if you want a pellet gun with you, springers and breakbarrels arent going to do much for self defense due to reload times and other silliness. A pcp wont help if you have fuel issues... a pump breaks etc. With auxilliary live tubes it opens up a world of mobility. For a trek, a few tubes can be packed charged. Seems way better to me that hauling any sort of pump up the mountain. I can think of numerous situations where having a number of tubes beats a single (or dual) fixed setup. I mean a dual tank is useless if its bad. At least if one auxilliary loses integrity, you have a backup or two. "Weighing" all options, the lightest and most secure way to take a Jet, or any pcp for that matter, on a trek is with a few auxilliaries. I know there are various sized tank for this, but I do not like the idea of having a larger tank, personally. I need room in my pack, for one. All about mobility.
People do have issue actually swapping the live tubes but maybe I can figure out a way to make it easy.

Also, I'm looking at trying a slug barrel and it would help to have a support point.

i suppose another reason is I do want the double air capacity but dont want to trade off to a fixed tube. Would be ok with numerous shorter tubes but it is an upgrade to have the ability to combine them and extend shot count.

[avator]

You just know eventually someone is gonna do it.... a Jet 2 with double extended tubes.   

[ModFox]

Lols.
Definitely not me though. I know I'd just switch to a drop down tank or something at that point, and I would no longer want to use it. But tinkerers gonna tinker.

I actually really want to fit the Air Venturi Avenger smaller hidden tube to the Jet 1. It would likely be lighter than Jet tubes in series and is a single unit. The Avenger original should mod to a Jet 1, while the AvengeX should mod to a Jet 2 with a little more difficulty. The port hole and o rings on the AvengeX are not in the same locations as the Jet 2's, so I'm unsure yet. The Avenger original seems to have usable tubes though.

[Rat Sniper (AKA: PaulT58)]

Since I upgraded my .25 cal Jet from single cylinder to double cylinder, I have a second cylinder and a spare valve.  I had this idea of using the spare valve as a way to fill the spare cylinder off the gun since they are pretty tough to actually off the gun when fully charged!  I added some Permatex anti-seize grease to the threads of the valve on the gun and those on the spare valve.  Now I can fill the spare off the gun to 250 BAR and easily unscrew it from the spare valve.  A full cylinder is still difficult to unscrew from the gun, but one with only 100BAR in it comes off pretty easily with the anti-seize grease.  So, much easier to head out with 2 full cylinders and swap them in the field when needed.

[ModFox]

Since I upgraded my .25 cal Jet from single cylinder to double cylinder, I have a second cylinder and a spare valve.  I had this idea of using the spare valve as a way to fill the spare cylinder off the gun since they are pretty tough to actually off the gun when fully charged!  I added some Permatex anti-seize grease to the threads of the valve on the gun and those on the spare valve.  Now I can fill the spare off the gun to 250 BAR and easily unscrew it from the spare valve.  A full cylinder is still difficult to unscrew from the gun, but one with only 100BAR in it comes off pretty easily with the anti-seize grease.  So, much easier to head out with 2 full cylinders and swap them in the field when needed.

Legit. I think I would do the same. I'm currently onto a mod for a slug barrel and those don't come short, so I'm hoping to gain some barrel support by adding a longer single on the Jet1.

I DO have a second Jet to mod, we'll see where that one goes. My initial plan was to mimic the EdGun Lelya 2.0.

[ModFox]

Wait.... so you can unscrew your Jet 2 tubes at less than 100 bar and replace one w a charged Jet 1 tube as ypu described? So the Jet 2 IS reloadable? Does each Jet 2 tube have a valve to hold air when its removed? I thought that was the main difference, that there is no way to swap a Jet 2 tube..  i should hqve known, but figured there was a valve missing from the Jet 2 tubes that would make it dangerous.

Im a newb.

[Rat Sniper (AKA: PaulT58)]

Wait.... so you can unscrew your Jet 2 tubes at less than 100 bar and replace one w a charged Jet 1 tube as ypu described? So the Jet 2 IS reloadable? Does each Jet 2 tube have a valve to hold air when its removed? I thought that was the main difference, that there is no way to swap a Jet 2 tube..  i should hqve known, but figured there was a valve missing from the Jet 2 tubes that would make it dangerous.

Im a newb.

Officially: No... Unofficially: Sorta...  I originally purchased two Jet 1s, one in .22 and one in .25.  I purchased the dual cylinder and converted the .25 Jet 1 to a Jet 2.

My .22 Jet 1 has the air cylinder that unscrews and is hot swappable.  Since you replace the single cylinder and valve when you change it to a Jet 2, I now have a spare single cylinder and valve with the screw on adapter.  What I did was screw the spare valve onto the spare cylinder and fill it with my air source.  I could then unscrew the spare cylinder and take it with me.  The cylinder unscrews from the spare valve much easier when under full pressure than it does from the gun, but only because you can get a better grip on the cylinder and valve than trying to grab the cylinder when it's attached to the gun.

Now, waving said that, there is only 1 or 2 screws that secures the valve to the gun and when under pressure, the valve holds air just fine.  So, technically, when you removed the dual cylinder from the Jet, the valves comes out with it.  Since the valve is sealed, you could undo the retaining screw(s), and pull the whole dual assembly and replace it with another while it's under pressure!  Hatsan says you can't, but I'm sure that's the lawyers giving their input.  As long as the cocking lever is back and the hammer is not resting on the valve stem there is no reason air would escape from the valve.  So replacing one dual cylinder assembly with another should be possible, while under pressure.

Disclosure:  I have not tried this and probably won't.  If you do, do so at your own risk. 

[ModFox]

Since the valve is sealed, you could undo the retaining screw(s), and pull the whole dual assembly and replace it with another while it's under pressure!



K I get that, but can you remove either tube from the valve body of the Jet2 while under pressure and actually use a spare tube from the Jet 1 leftover? I guess Im not seeing how to utilize a spare Jet1 tube that you've charged using the spare valve off the gun like you described. How do you actually use that tube?

[ModFox]

Since I upgraded my .25 cal Jet from single cylinder to double cylinder, I have a second cylinder and a spare valve.  I had this idea of using the spare valve as a way to fill the spare cylinder off the gun since they are pretty tough to actually off the gun when fully charged!  I added some Permatex anti-seize grease to the threads of the valve on the gun and those on the spare valve.  Now I can fill the spare off the gun to 250 BAR and easily unscrew it from the spare valve.  A full cylinder is still difficult to unscrew from the gun, but one with only 100BAR in it comes off pretty easily with the anti-seize grease.  So, much easier to head out with 2 full cylinders and swap them in the field when needed.

I see how the pressure gauge is set on a Jet 1 tube, somewhat protected inside its own little cavity so you don't unscrew it trying to wrestle off a live tube. That would be catastrophic.

It dawns on me that this cavity is an opportunity to design in a couple notches or something to allow a centrifical leverage device to be used. Even a small allen wrench can add leverage, if there were just maybe 2 or 3 places to insert it inside of that cavity yoi could gain leverage for hot swaps.

The sleakness of the tube is great, and it fits so snugg to the barrel shroud, but for the Jet1 there just isnt an easy way to get leverage so I may work on that concept. I found a custom pcp tube maker, offers a titanium tube with your choice of end fittings, 300 bar. I figure I can then find a way to customize the end piece that accepts the guage. All that would be needed is two small holes so it could accept a tool. The tool I have in mind is for grinding wheels and sometimes circ saws, for blade swaps. You would uncrew the guage housing first but youd be able to have true leverage as long as the threads were in reverse. Thats a total custom build, but doable. Then I'd be regulating down from 300bar, but that seems ok. In theory thats ideal if I could regulate.

[Rat Sniper (AKA: PaulT58)]

I only use the spare cylinder on the Jet 1.  The dual tubes on the Jet 2 are not individually removable, they only come off as an assembly that includes the valve.

The single cylinders have a valve built into them, the tubes used with the Dual Tube assembly do not.

[Insanity]

Paul do you have some pics of both? It may help show the difference.

[Rat Sniper (AKA: PaulT58)]

Paul do you have some pics of both? It may help show the difference.

I do, but not removed from the gun.  The top picture is the Jet 1 in .22 and the Jet 1 that was converted to a Jet 2 in .25.

The bottom picture is the valve I removed from the .25 Jet.  It's shown without the air cylinder attached, so you can see the threads where the air cylinder screws onto it. 

The Jet 2 does not have that threaded adapter.  I have not taken the dual cylinder assembly apart, but I'm assuming the threads are on the inside diameter of the cylinder wall just like most air cylinders.  I suppose you might be able to modify the dual cylinder assembly so that both air cylinders could be screwed on, but it would increase the weight tremendously, and I don't know if the threaded adapter on the valve can even be fitted to the Dual Cylinder block. 

The whole purpose of my post was to show a Jet 1 could easily be converted to a Jet 2 and the spare valve could be used as a fill adapter for the left over single air cylinder. 

[avator]

Wonder if a guy could buy a half dozen or so of those foster caps?

[Rat Sniper (AKA: PaulT58)]

Wonder if a guy could buy a half dozen or so of those foster caps?

Next best thing:

https://a.co/d/7mdAONG

And they are harder to lose!


Edit
Link not showing up...

[avator]

I'll look for 5/16 rubber screw caps at Lowes when I go for springs while I'm in Troy this month.

[ModFox]

Thanks for the input on this stuff.
I feel like I need to dissassemble a Jet 2 tubes and valve setup fully. I would make it my next video, but the next one in line is a good video showing a full teardown of the Jet. If I can get a Jet2 dual tube setup on the cheap I will prolly make that dissasembly part of the same video.

 It may be that since they wont have inner valves on the Jet 2 tubes, each of those could be added in line to a seperate Jet1 tube. Keeping the same foster fitting on my jet 1, I would be able to replace the Jet2's terminal foster valve with a guage. I kinda need all the parts in front of me. Does anyone have a Jet2 dual cylinder thay want to part with?

[ModFox]

Anyone ever tried this type of stuff w their buttstock? I found that extra inch in the rear is essential for me, guess I'm too big at 5'11". It really makes a huge difference. The lower portion is a great balancing mod. It feels waaaaaaay better in one arm that way. I like larger, heavier rears. I mean, I like big butts and I cannot lie. It just flows better for me when pulling up to aim. i like it to be touching my inner elbow. Feels more like an extension of my arm that way and I get way faster sighting..

[ModFox]

So I take it noone has done much to their Jet buttstock.... seems everyone just accepts it like bad cafeteria food? All the effort to shoot good powerful shots with close shot strings etc... and literally everyone is using something sized for a juvenile? Its ALMOST unbelievable.
 

[Back_Roads]

 Set mine up in compact mode, also a bottle not as compact but short LOP, for shooting from tight places.

[avator]

It's all a matter of personal preference.