Edgun air tubes
Anyone know what material (7075-T6?) and the max pressure rating is on Eds tubes? Just curious as to the specs. I know he prefers to use socket head cap screws vs threads which I understand is a stronger solution.
Thanks
DT
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Dan
I fill both Lelya and Veles up to 240 bar.
My brother Brian …
Believe that i wanted to reply Eduard and tell him the same that you wrote. ..
Yes… exactly you hits my point. …
Ed I think Hemn is asking if it is possible for someone to make a regulator that is just as efficient at 300 bar as it is at 220 bar ? He is wondering what that would take to make such a regulator.
I have threads at Lelya and Veles reservoirs and test them the same way, no problem and no movements.
Ed
Thanks Ed. Can you take the Lelya to 250b with good results? I typically fill to about 210-220b.
Dan
So…what is the best solution for regulator to work at 300 bar correctly just how they perform well at 220 bar?
Do you think you have to use more powerful springs in the regulator??
In this case.. i think the reg will not work properly in lower pressure like below 200 bar.. am i make any sense??
If my opening is correct ..then what do you think??
I believe next challenge for bullpup rifles is producing the proper regulator that able to work for with 300 bar…. and which company can provide the maximum number of shoots for the customers. … ??
The best solution to use it down 250 bar, at least until you have acceess to the air tanks with the working pressure more then 300 bars. Otherwise you will fill your gun up to 300 bar once and then you will need to fill you tank again. So, why?
Ed…
So…what is the best solution for regulator to work at 300 bar correctly just how they perform well at 220 bar?
Do you think you have to use more powerful springs in the regulator??
In this case.. i think the reg will not work properly in lower pressure like below 200 bar.. am i make any sense??
If my opening is correct ..then what do you think??
I believe next challenge for bullpup rifles is producing the proper regulator that able to work for with 300 bar…. and which company can provide the maximum number of shoots for the customers. … ??
I have threads at Lelya and Veles reservoirs and test them the same way, no problem and no movements.
Ed
I found photo of 2006 at my computer of how it was 🙂 So old and funny how it was 10 years ago.
So, you can see the gauge and the reservoir testing:
Here is can see the maximum damage of the reservoir. As you see the tube is OK but the wholes for the screw head became ellipse out of circle. That was the only damage. Once, when we reached the pressure of 650 bar the plug moved back in those ellipce wholes and O-ring reached the whole and the water just went out and the pressure dropped down. The same could be with the air, you will get just blast of air out of that whole due to the O-ring broken and that’s it.
The limit in 200 or 220 bar was not for the tube, most for the regulators, as above 220-240 bar the regulator is not working correctly and the air efficiency “the volume of air spent per Jole of energy is very low. Yes, I could tell like other manufacturers that EDgun is working at 300 bars and bellow but I consider that as a kind of trick which doesn’t give user any advantage but instead is adv. no more.
At with all new guns which are made of the same material I don’t want to tell that the working pressure is 300 bar, why?
Hello Ed,
Thanks for answering and sharing your knowledge. That is a monster rig you have there. :suprisedn: You definitely don’t need glasses to see that gauge.
Good to see your tubes are way over engineered! Also interesting to see that the cap screws held tight and the aluminum deformed but everything held together. I wonder how threads would have performed?d Maybe not as good? Great design and material selection.
i completely understand why filling to 300b is a waste of air and energy even though your tubes can handle it no problem.
Thanks again Ed.
Dan
I do agree with brother Kayser…. unless one of the manufacturers come up with a decent regulator that able to wotk at 300 bar perfectly. ..otherwise. .i don’t like to treat with all current regulators at 300 bar… only wasting air…
Edit: i just saw Eds post.. see guys…i never say anything from my pocket. .. :biggrinn:
I have discussed this matter with Ed long time ago.. but as he posted now… he told me the same…. air consumption will be the same…
So…there is only one way….just create a new Regulator working with 300 bar correctly
From the beginning of making PCP guns I use Russian duralumin D16T (the West analogue is 20204 Т6) . The minimum thickness of the wall is 3.2 mm, that makes it able to carry up to 1’000 bar pressure by the theoretical calculations. I take samples from every new delivery of tubes to crush it by hydraulics test. My equipment doesn’t allow me to reach 1’000 bar pressure, maximum I can reach is 650 bar. For all that time I never was able to destroy it.
I found photo of 2006 at my computer of how it was 🙂 So old and funny how it was 10 years ago.
So, you can see the gauge and the reservoir testing:
Here is can see the maximum damage of the reservoir. As you see the tube is OK but the wholes for the screw head became ellipse out of circle. That was the only damage. Once, when we reached the pressure of 650 bar the plug moved back in those ellipce wholes and O-ring reached the whole and the water just went out and the pressure dropped down. The same could be with the air, you will get just blast of air out of that whole due to the O-ring broken and that’s it.
The limit in 200 or 220 bar was not for the tube, most for the regulators, as above 220-240 bar the regulator is not working correctly and the air efficiency “the volume of air spent per Jole of energy is very low. Yes, I could tell like other manufacturers that EDgun is working at 300 bars and bellow but I consider that as a kind of trick which doesn’t give user any advantage but instead is adv. no more.
At with all new guns which are made of the same material I don’t want to tell that the working pressure is 300 bar, why?
just the info I was looking for. Thanks again..
Bee,
I have filled the Colibri to 300 BAR. In simple terms from 300 bar to 220 bar (80 BAR) I got one magazine. From 220 bar to 150 bar yielded 3 Colibri magazines.(70 BAR). That was shooting the 18.1 at 890 FPS. Filling a gun to 300 BAR eats air off your main tank as well. I own a compressor so I don’t care but if you plan on a long day of target shooting you are better off keeping the gun below 250 especially if you don’t have a large supply tank. I think a listed “300 BAR” fill rating is a sales tactic.
Keyser, did you do any of the fill testing/shot count with the Colibri? So far we’ve been filling them to around 240 BAR, but was wondering if its worth going higher and stressing the gun? Heard they can take a 300 fill but I never did it..We are away from the air tanks when we hunt, so in my case it might be worth it..but will err on the side of caution..
218bee
Sounds good. Appreciate the feedback guys.
I was also curious, from an engineering standpoint, what the safety factor is on these tubes based on wall thickness and tube material. Mainly out of curiosity and to better understand the dynamic behind the design.
Regards,
DT
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I understand what he says but since I have no idea why it happens so, I have no ways to avoid it, thus have nothing to say about it 🙂