"In the world of spuds today"
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jackssmirkingrevenge
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Crosman 2240 big bore musings with a balanced valve:
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Gippeto
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"Tube in tube" is an interesting idea. 
Maintaining stock dimensions for the most part?
Maintaining stock dimensions for the most part?
"It could be that the purpose of your life is to serve as a warning to others" – unknown
Liberalism is a mental disorder, reality is it's cure.
Liberalism is a mental disorder, reality is it's cure.
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jackssmirkingrevenge
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I figure 6061 with 1/16" wall thickness sleeved snugly inside should be more than enough for a 3000 psi working pressure."Tube in tube" is an interesting idea.
Yes, GGDT suggests that it should be ok for close to 500 fps for approx 75 grain 0.357" projectiles in a 6 inch barrels, though I doubt I would get more than 3 useful shots per fill. The other possibility I'm considering is adapting it for a 13 ci bottle similar to what Bob did here and using a longer barrel at approx 850 psi regulated for a larger and more consistent shot count.Maintaining stock dimensions for the most part?
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Air2theBrain
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Was just reading that article you linked Jack, can't believe the amount of shots he achieved on a single fill. 
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jackssmirkingrevenge
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The trick is the use of a regulated bottle, filled to 3000 psi but with an output of 850 psi. Ninja bottles in particular have easily adjustable regulators that can be taken down to around 450 psi, something to consider for a high performance QEV+3 Way Valve repeater.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Air2theBrain
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For sure...was just looking at regulators before. : )
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Gippeto
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In the event you don't have enough ideas (jackssmirkingrevenge wrote: The other possibility I'm considering is adapting it for a 13 ci bottle...
)...those with threads are intended to install into a 22xx tube. 
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Liberalism is a mental disorder, reality is it's cure.
Liberalism is a mental disorder, reality is it's cure.
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jackssmirkingrevenge
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That's a nice production like you got there! Does it use an empty CO2 capsule to seal?
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Gippeto
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Uses an oring to seal to the tube, so tube is pressurized and valve needs to be sealed and properly secured.
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Liberalism is a mental disorder, reality is it's cure.
Liberalism is a mental disorder, reality is it's cure.
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jackssmirkingrevenge
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Presumably this is only safe for regulated HPA within the constraints of the tube that is not normally pressurized.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Gippeto
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Co2, low pressure pcp (2000psi) or regulated. Wouldn't use or suggest using a factory 22xx tube beyond that.
Can't stress enough that valve needs to be properly secured.
http://www.airgunforum.ca/forums/topic69553.html
Walter did a hydrotest on a 2240 tube a while back, first sign of failure was associated with bearing stress on the tube wall where the valve was secured. Calculated yield strength was similar to 4130, but since we don't actually "know"...erring on the low side seems wise.
Can't stress enough that valve needs to be properly secured.
http://www.airgunforum.ca/forums/topic69553.html
Walter did a hydrotest on a 2240 tube a while back, first sign of failure was associated with bearing stress on the tube wall where the valve was secured. Calculated yield strength was similar to 4130, but since we don't actually "know"...erring on the low side seems wise.
"It could be that the purpose of your life is to serve as a warning to others" – unknown
Liberalism is a mental disorder, reality is it's cure.
Liberalism is a mental disorder, reality is it's cure.
ITWOST, it turns out a black square QEV (ebay special, 3/8" output, 1/2" everything else) happily handles 1700psi. Pilots rather violently too. Further testing will feature a functional chamber as opposed to a plug, probably about 100cc.
/sarcasm, /hyperbole
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jackssmirkingrevenge
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No video to share?Zeus wrote:ITWOST, it turns out a black square QEV (ebay special, 3/8" output, 1/2" everything else) happily handles 1700psi. Pilots rather violently too.
hectmarr wrote:You have to make many weapons, because this field is long and short life
Video when it's more than a vapour cloud making machine Jack, it's borrrrrriiiinnnngggg. And whenever I decide to break it, I do that into a lump of fittings on the output, so it'll be no more than a thud! But first I want to find out what a AA does with 1500psi up its kiester.
By the by, it turns out I had left the (buggered) core in the schrader, when I tried to pilot it, I got the traditional sprinker valve farting noise. I think that's gotta be the highest pressure valve fart I've encountered.
And if anyone has suggestions of things for me to try to break with HPA, I'm interested to hear them. On the list so far are a variety of PVC and black poly fittings, maybe a 3/2 valve (after testing how much pressure one will work at reliably). We all know stuff like slide valves just leak or seize up. Perhaps a pneumatic cylinder too, but I'm out of ideas otherwise.
By the by, it turns out I had left the (buggered) core in the schrader, when I tried to pilot it, I got the traditional sprinker valve farting noise. I think that's gotta be the highest pressure valve fart I've encountered.
And if anyone has suggestions of things for me to try to break with HPA, I'm interested to hear them. On the list so far are a variety of PVC and black poly fittings, maybe a 3/2 valve (after testing how much pressure one will work at reliably). We all know stuff like slide valves just leak or seize up. Perhaps a pneumatic cylinder too, but I'm out of ideas otherwise.
/sarcasm, /hyperbole
