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Mythbuster Air Cannons

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: boyntonstu » Fri Apr 01, 2011 12:28 pm

Labtecpower wrote:None, i guess. But the way you present yourself on this forum is very negative I think.

Why not have fun & talk about launchers :)



What launchers have you made?

Have you seen mine?

Copper Air Rifle Components and Assembly

I will be glad to answer any of your questions.
[youtube]http://www.youtube.com/watch?v=qku0i8LqZws[/youtube]
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Unread postAuthor: jrrdw » Fri Apr 01, 2011 12:28 pm

Thread cleaned, stay on topic. No threadjacking, start or reply to your own.
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Unread postAuthor: boyntonstu » Fri Apr 01, 2011 12:32 pm

Why not have fun & talk about launchers Smile

Indeed.
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Unread postAuthor: Labtecpower » Fri Apr 01, 2011 12:40 pm

@Boyntonstu:

What launchers have you made?

You can find my cannons in the list on the bottom. If you have any questions, ask me :) (I dont think you need to)

I suggest you make the same list as I did. If everyone does something like that, we get a nice cannon database.
If JSR did so, it would get a mess.

I can remember the Trom-Boyne, BoyntonButterfly, BoyntonBanger, ..
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Unread postAuthor: boyntonstu » Fri Apr 01, 2011 1:49 pm

Labtecpower wrote:@Boyntonstu:

What launchers have you made?

You can find my cannons in the list on the bottom. If you have any questions, ask me :) (I dont think you need to)

I suggest you make the same list as I did. If everyone does something like that, we get a nice cannon database.
If JSR did so, it would get a mess.

I can remember the Trom-Boyne, BoyntonButterfly, BoyntonBanger, ..


OK

I shoot my copper at 650 psi.

What is the highest pressure that you have used?

At 650 psi my cannon has the energy of a .38 Police Special.

That was my baseline goal.
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Unread postAuthor: Labtecpower » Fri Apr 01, 2011 2:01 pm

232 psi is the highest i've used. That was with my copper gun.

My 6 mm is good for much more, but I don't have a suitable compressor.

The QDV launcher uses about 100 psi, and is really powerful at that pressure. (1000 joules) I want to take it to 250 psi.
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Unread postAuthor: mark.f » Fri Apr 01, 2011 2:20 pm

boyntonstu wrote:I shoot my copper at 650 psi.

What is the highest pressure that you have used?

At 650 psi my cannon has the energy of a .38 Police Special.

That was my baseline goal.


Oh yeah? Well I fill my copper cannon to 432 torr per feet per minute.

At 432 torr per feet per minute, it has the same muzzle energy as a .22 Hornet with 570 tons per mm<sup>2</sup> divided by time.

So, my baseline goal was to have a .22 LR traveling at 573 cannons per torr to generate a kinetic force of 793 feet per ton per square minute.

Actual measured results point towards a figure of 23 cannons when firing at 75 tons per minute per .22 LR, so I guess I have to do some more testing or buy a better microwave.
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Unread postAuthor: boyntonstu » Fri Apr 01, 2011 2:32 pm

mark.f wrote:
boyntonstu wrote:I shoot my copper at 650 psi.

What is the highest pressure that you have used?

At 650 psi my cannon has the energy of a .38 Police Special.

That was my baseline goal.


Oh yeah? Well I fill my copper cannon to 432 torr per feet per minute.

At 432 torr per feet per minute, it has the same muzzle energy as a .22 Hornet with 570 tons per mm<sup>2</sup> divided by time.

So, my baseline goal was to have a .22 LR traveling at 573 cannons per torr to generate a kinetic force of 793 feet per ton per square minute.

Actual measured results point towards a figure of 23 cannons when firing at 75 tons per minute per .22 LR, so I guess I have to do some more testing or buy a better microwave.


Nicely said.
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