funny project 100" 78" barrel
a friend “aero tech student” told me that if i were to use a tube for pushing out ‘light’ “tungsten carbide bearing” ball, it won’t be much difference between a 2meter barrel vs a 3 meter barrel.
is that true??
i’d thought no matter what, the friction is still less than high pressure air push behind the bullet?
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hahahaha artillary power is wot i’d want in an air rifle i can ever have it!!
hey, aren’t we still getting very positive air expansion ?? as in the high pressure gas is still much higher than the friction after say 2 meters?
No difference only if the god of physics is on vacation…
You will be subject to another meter of friction as well as more volume for the air charge to spread out and decrease it’s influence on the projectile…
3 meter barrel sounds like a heavy artillery air cannon… 😯
oh woops.
its a .25 cal
the valve volume is around 0.5 cu inches BUT is a bullpuped one that is connected (8mm dia port x 2) to a separate discharge tube with around 2Cu inches of volume
the gas is co2
longer barrel more power…IF the valve can provide air enough
you never talked about pressure…can you run 4500 psi….6000 psi..higher psi ?
helium, nitrogen or scuba air ?
size of tank, prechamber, pressure, dumpvalve….
That depends.
What cal. is the barrel?
What is the capacity/discharge speed of the exhaust valve?
To many variables missing to know if your friend is correct or not.
I would say that if the barrel is .177 cal. and the valve stores 1 cubic inch of air, he is correct. On the other hand, if the barrel is .50 cal. and the valve stores 24 cubic inches (a crazy figure to prove a point) of air that we assume can be discharged in roughly the same time it takes your tungsten bearing to travel down and out of your 3 meter barrel I think his answer may be wrong.
At some point friction loss will come into effect on both the projectile and the air itself but that is beyond my scope of late night guess-inering, though I am sure there are a few cats on here that can give you a proper answer to all of the above.
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Probably but maths would be in order…
.25″ is 31.67 sq mm (or 3.167e-05 sq m), multiply that by 3 meters and you have your barrel volume…