A word of caution
Remember, these are high pressure guns! More on this later, I have to get back to work right now.
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another reason we need to know why this failed.
makes me wonder about even carbon fiber units.
Walter
Would a tank dump blow up a plastic shroud?
Probably as the working pressure for most ABS pipe is 160psi so if the ends held and the pressure went to 1,000psi it would shatter. WAYYYY more explosive than the AAA aluminum shroud did.
Walter….
another reason we need to know why this failed.
makes me wonder about even carbon fiber units.
Walter
Would a tank dump blow up a plastic shroud?
Walter
I believe the usual material for a “unit” would be silicone…. but please keep that in the off Topic !
Well, under normal shooting not likely.
another reason we need to know why this failed.
makes me wonder about even carbon fiber units.
Walter
IMHO the shroud was just too thin for the pressure it saw.
I am betting the tank dumped and teh thin material failed with the pressure it got.
Again if we get the answers to the thickness and diameter we can calculate a burst pressure which all helps in understanding the failure and how to prevent reoccurence.
Without full disclosure we are only guessing.
Walter….
So, do you think that a plastic shroud would explode under normal shooting conditions. Say a wall thickness of 3/32″ made of abs plastic… ❓
Slow acceleration, cumulative velocity space travel via bb rifle – Be like an ion thruster.. but crap, lol
Even if he was outside and not attached to the craft he’d have thrusters of some kind that could take care of that problem. If he doesn’t… then he’s in a world of shit.
I agree it wouldnt be alot of backward force, but, the movement that force created wouldnt stop unless it was countered. One shot could propel you all the way to the moon, REALLY SLOW ). I also ASSumed that the shooter would be outside of the ship with just his suit and the gun.
No need, Yeah it would push the shooter back…. but a minuscule amount if you compare the amount of force pushing the pellet compared to the equal force pushing back the spaceman, his suit, the gun and his space craft.
Now if the tank dumped…. then you might notice it depending on the size of the spaceship.
Walter – I expect some formula’s and working examples on my desk by 2300hrs.
Airguns in space, that sounds like a ton of fun. Higher velocities and no pellet drop. I guess you would need a valve system that vented in two directions though eh?
I think he shot it in outer space…..
I don’t buy the deiseling suggestion.
IMHO the shroud was just too thin for the pressure it saw.
I am betting the tank dumped and teh thin material failed with the pressure it got.
Again if we get the answers to the thickness and diameter we can calculate a burst pressure which all helps in understanding the failure and how to prevent reoccurence.
Without full disclosure we are only guessing.
Walter….
The material fails and the energy release IS catastrophic.
At a full 3000psi, yeah I can see it, but would the amount of air released in a normal shot be enough to create the pressure required to blow that thing apart like it did… That is where I was headed…
If you know the interior volume and the opening diameter at the end could you extrapolate how much pressure would be required to plug the hole enough with air and pellet to make the thing blow up? The air would probably have to be moving past the speed of sound to dynamically change it’s movement properties enough to fill the hole. Like a typical jet inlet gets clogged at the speed of sound with air and will stall…
Do we know if he used a pump, I was thinking of the same thing regarding lubrication from the pump atomized in the air tank…
Tony, can you measure the wall at the split?_________________
and the inside diameter of the shroud?______________________
That will give us a clue as to the pressure required to fail.
Be good to know the real story and that is why I was asking the OP how many shots per fill he was getting. If this is a tank dump the shroud could have seen around 1,000psi or so.
To those that think a vessel split won’t rip apart and just leak out the pressure this is a good example of how it really happens.
The material fails and the energy release IS catastrophic.
I sure hope we can find out the most plausible explanations and sooner rather than later.
Walter….
What do you think about the dust bomb effect? Lots of tiny particles of a usually slow-burning substance gets distributed in the air. This allows millions of times more surface area to be exposed, and with only a small ignition source, it sets off a chain reaction of small burning particles, creating an enormous pressure wave. (Google it, the videos are insane)
I think this might be possible because Euin Jins come coated in a thick layer of what appears to be motor oil, which could be aerosolized in the shroud over a number of shots and then set off by a “diesel” shot or even lead flashing into incandescence from the friction in the barrel.
I also believe this may be implicated because of the conspicuous explosion like “banana peel” effect of the shroud unraveling, which is indicative of high pressure.
By the way, I can personally attest to having serious dieseling in a PCP, when I recieved my TSS, I used an AF handpump that looked like it was coated everywhere inside with a light petroleum oil and when I did a test shot at night, I saw a small flash on my fist shot and the gun smoked like crazy…So with the right combo of heavy pellets and lube, it can happen (I know WOK will somehow twist that statement into something dirty) 😯
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I’m gonna have me some fun this weekend! 😉