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I am resisting the temptation to ask if people think this might be enough medicine for squirrels. I am resisting the temptation to ask if people think this might be enough medicine for squirrels. Hey Bob you just convinced me you really are crazy! Man it sounds like you are shooting a dam cannon not an air rifle lol Please do NOT ask me to make that one quiet! Take
care and be safe with that thing, Neil.
care and be safe with that thing, Neil.
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I laughed my ass off when you shot that pumpkin. I hope there is something left of your hog after you shoot it...... Reminds me of a scene in spaceballs when John Candy said "they gone to plaid". Well my friend......youve gone to plaid!!!
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It was friendly enough for my backyard .
With some spring and/or valve tweaking, it could probably squeeze out more FPE, but is there any reason to? Well hell yes, because it's great fun!
But of course that's up to Bob.
Tedd
.With some spring and/or valve tweaking, it could probably squeeze out more FPE, but is there any reason to? Well hell yes, because it's great fun!
But of course that's up to Bob.
Tedd
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Boy am I glad I am not your neighbor Tedd if that is what you shoot in your back yard, lol My wife thinks my small air guns are obnoxious, I think she would have a fit if I were to start shooting something like that in our back field. That is a beast of a gun! I hate to think what it will do to the animal on the receiving end, those slugs really opened up, they would make one big hole in anything it hits.
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I got a similar peak power curve that day with my XP .452 using helium.
A 128 grain bullet gave 1410 FPS and 565 FPE, with only 3600 PSI, and only a 23-inch barrel, with standard spring and valve. It was basically a single "dump" shot with an end pressure of 850 PSI.
I'm guessing that different helium PSI and spring/valve tuning could result in 3 useful shots, at lower power, but still more powerful than regular air.
Tedd
A 128 grain bullet gave 1410 FPS and 565 FPE, with only 3600 PSI, and only a 23-inch barrel, with standard spring and valve. It was basically a single "dump" shot with an end pressure of 850 PSI.
I'm guessing that different helium PSI and spring/valve tuning could result in 3 useful shots, at lower power, but still more powerful than regular air.
Tedd
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That velocity is incredible, to get that type of power from an air rifle is nothing short of amazing, Neil.
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I have one of those slugs on the shelf in my office, when people see it they can't beleave that an airgun can shoot a slug that big. I wil have to show them this video! I have a 457 extreme big bore and I could not beleave the difference between air and helium. This is my kind of back yard friendly!
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My backyard is 100mm friendly! (Home made Black Powder Cannon shooting large block chevy pistons)
Not nearly as accurate though.
Thurmond
Not nearly as accurate though.
Thurmond
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Some one school me on Helium, Why is it putting that much power in an air gun,
If you tried to shoot it in a regular PCP what would happen?
I do think it a little over kill for sparrows, Sure would save me a lot of time on the clean up of sparrow parts,
In my area when I was trying to get a 6000 psi nitrogen tank they (lots of shops) Thought I was nuts.
If I went back and tried to get Helium they would send me to the funny farm,
Mike
If you tried to shoot it in a regular PCP what would happen?
I do think it a little over kill for sparrows, Sure would save me a lot of time on the clean up of sparrow parts,
In my area when I was trying to get a 6000 psi nitrogen tank they (lots of shops) Thought I was nuts.
If I went back and tried to get Helium they would send me to the funny farm,
Mike
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T3PRanchIF you have an Elephant pest problem I would have to agree!
Thurmond
You should see the size of the rats! The elephant's are like ants in comparison!
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Helium is much smaller and lighter than nitrogen, which is the predominant composition of air, in addition to oxygen and carbon dioxide. So at any given relative pressure to air, it can move more rapidly, including the energy required to overcome static inertia. That translates into more energy behind the projectile, essentially. Here is a cool interactive periodic table of elements: http://www.ptable.com
ok, probably not that cool to most
ok, probably not that cool to most
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Prouzy
Thanks, Pretty well what I was thinking , Just could not go back further in my schooling to figure it out,
Pretty crazy stuff.
Mike
Thanks, Pretty well what I was thinking , Just could not go back further in my schooling to figure it out,
Pretty crazy stuff.
Mike
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iride-- on the diffeience due to He:
for practical purposes, the size of the gas molecule does not matter, only the mass does.
The ideal gas law approximates all gases at a set volume, temperature, and pressure as having the same number of molecules. Helium is monoatomic, molecular weight about 4. Air is about 80% nitrogen, 20% oxygen; both are pairs of atoms. Nsub2 and Osub2 have weights of approximately 28 and 32 respectively.The effecive molecular weight of air is thus about 29. The average kinetic energies of a volume of He and of air are equal, so we have :
Mass He(velocity He)^2=mass air(velocity of air)^2
4(v He}^2=29(v air}^2
If we call the velocity of the air molecules 1, we get
4(v He)^2=29
v(He)^2=29/4= 7.25
v(He)=2.7 times the speed of air
So helium has the same energy to impart as a matching volume of air, but does it faster, yielding a more effecient transfer of energy.
for practical purposes, the size of the gas molecule does not matter, only the mass does.
The ideal gas law approximates all gases at a set volume, temperature, and pressure as having the same number of molecules. Helium is monoatomic, molecular weight about 4. Air is about 80% nitrogen, 20% oxygen; both are pairs of atoms. Nsub2 and Osub2 have weights of approximately 28 and 32 respectively.The effecive molecular weight of air is thus about 29. The average kinetic energies of a volume of He and of air are equal, so we have :
Mass He(velocity He)^2=mass air(velocity of air)^2
4(v He}^2=29(v air}^2
If we call the velocity of the air molecules 1, we get
4(v He)^2=29
v(He)^2=29/4= 7.25
v(He)=2.7 times the speed of air
So helium has the same energy to impart as a matching volume of air, but does it faster, yielding a more effecient transfer of energy.
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Yes. This is why the speed of sound in Helium is 3x higher, and why it makes voices squeeky.
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