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A place to ask general spud cannon related questions.
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Unread postAuthor: wyz2285 » Wed May 15, 2013 8:23 am

Anybody uses Autodesk Inventor pro 2014?
I need somebody how can teach me a little (can't find answer in the tutorials)
Per example how can I place a spring using constrain in the assembly format?
I can attach the file but don't know how.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: wyz2285 » Mon Jun 03, 2013 4:29 pm

2C4H10 + 13O2 = 8CO2 + 10H2O
I was trying to figure out the energy output of this commonly used reaction.
So it should be the energy of the formation of the 8CO2 + 10H2O minors the energy used in the dissociation of the 2C4H10 + 13O2 right?
Then it should be: 21148-11612=9536kJ per 2 mole of C4H10, witch equals to 4768kJ per mole. Right?
Now I'm trying to see how much energy I've put into a 210ml 10x hybrid, 3.2%x0.21x10= 0.0672l
According to Advogadro's law 1 mole occupies 22.41l, then 0.0672/22.41=0.003 mole. 0.003x4768=14.304kJ.
Of course I know real life is different from pure theory but did I done the calculations right?
Then why propane is better than butane?
5O2 + C3H8 = 4H2O + 3CO2
Energy: 8162-6472 = 1690kJ per mole, 4.2%x0.21x10= 0.0039
0.0039x1690= 6.65kJ
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: ramses » Mon Jun 03, 2013 5:52 pm

The logic holds, didn't check the math. I assume your mix number is 10?

There is also a non-trivial amouunt of energy in the fact that the gas is above ambient pressure. It is not the simple pv energy equation, as the gas actually cools when you expand it so quickly. There is no easy way to model this (that I know of, taking thermo next semester), but an old version of GGDT did it.
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Unread postAuthor: wyz2285 » Mon Jun 03, 2013 5:54 pm

mix10, so it's the same amount of potential energy as a chamber with 10 times more volume at atmospheric pressure right?
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: ramses » Wed Jun 05, 2013 10:13 pm

the same amount of chemical energy, but there is also 'mechanical' energy in the compressed gas. This is the amount of energy that would be released if you simply opened the valve. ie, a if your cannon was a pneumatic with 9 bar of gauge pressure in the chamber.
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Unread postAuthor: wyz2285 » Thu Jun 13, 2013 9:45 am

I have a rough idea about how this might work, but I'd like to hear about other ideas :)
[youtube]https://www.youtube.com/watch?v=mltWqrBCPJY[/youtube]
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: finland66 » Thu Jun 13, 2013 12:47 pm

Just short guestion

How much good guality air quick connection can hold pressure.
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Unread postAuthor: wyz2285 » Thu Jun 13, 2013 1:08 pm

Witch type? oTop quality standard compressor quick connection wouldn't work pass 400 psi without damage the components, while a decent paintball quick connection takes 3000 psi :roll:
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: finland66 » Thu Jun 13, 2013 1:22 pm

Okay i meant normal compressor connection.
I cant get m hands on paintball connector but I need something for unreg co2 system any ideas
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Unread postAuthor: wyz2285 » Thu Jun 13, 2013 1:25 pm

Ebay and paintball connects
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: finland66 » Thu Jun 13, 2013 2:19 pm

No change to ebay :cry:
Mayby I can find them on my country but MAYBY or hydraulic connectors but they can easily cost lot of money.
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Unread postAuthor: wyz2285 » Thu Jun 13, 2013 2:52 pm

From your username I assume you're from Finland? If you're and you say you can't find a deal on ebay or can't find paintball stuff in your country, you're not looking hard enough.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: wyz2285 » Tue Aug 27, 2013 4:30 am

I'm looking for a new chronograph.
this one measures both in mps and fps, rof and muzzle energy, but use a lot batteries, can't be fold and haven't find any review about it.
classic chrony slightly more expensive, only measures mps but less batteries also fordable.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 27, 2013 4:45 am

wyz2285 wrote:fordable.


You're betraying your Asian roots :D

You can easily find online converters for muzzle velocity and energy.

https://billstclair.com/energy.html

For rate of fire, well there's always Audacity.
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Unread postAuthor: wyz2285 » Tue Aug 27, 2013 5:13 am

You can easily find online converters for muzzle velocity and energy.

https://billstclair.com/energy.html

For rate of fire, well there's always Audacity.
Obviously as a soon to be college freshman I know how to calculate the energy myself, but it's convenient to have a computer with audacity and both M1 and F1 chrony in one package :wink:
Found a video of the first chronograph measuring real bullets so it'll probably work for my hybrid so I'm more likely to buy it rather than the chrony.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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