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Rifled barrel?

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: wyz2285 » Sat Dec 04, 2010 4:37 pm

hard steel nails for center and a aluminum jacket 8)
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Unread postAuthor: jackssmirkingrevenge » Sat Dec 04, 2010 5:28 pm

wyz2285 wrote:hard steel nails for center and a aluminum jacket 8)


Oooh, are they going to space dinner :D

*ahem*

How about a diagram?
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Unread postAuthor: wyz2285 » Sun Dec 05, 2010 10:10 am

jackssmirkingrevenge wrote:
How about a diagram?
sure :)
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 05, 2010 10:28 am

This would be simpler to make and fly straighter:
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Unread postAuthor: wyz2285 » Sun Dec 05, 2010 10:54 am

Here is the finished product :P a smaller version of the real one(6mm not 8mm), a bit longer than the original design. mass concentrated in the front. Going to test it with the best air gun I have(the most accurate and has enough power to have a long range in this case 100m with normal air gun pellets) this weekend. Then i will make the real pellet of 8mm :D
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复件 P1010005.JPG
the gun
PC080021.JPG
PC080022.JPG
PC080023.JPG
PC080029.JPG
compare with a normal air gun pellet
PC080030.JPG
compare with a normal air gun pellet
Last edited by wyz2285 on Wed Dec 08, 2010 4:13 pm, edited 1 time in total.
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Unread postAuthor: saefroch » Sun Dec 05, 2010 12:06 pm

Sectional density. Want more sectional density in the front half. The way I understand it is if you decrease the inertia and increase the drag on one end, it's a lot easier for the projectile to pivot on its center of mass so the tail points back.

I may not even bother making the first one... but that's up to you. It'll certainly look awesome if you can make a design like that work. :D
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 05, 2010 3:39 pm

saefroch wrote:I may not even bother making the first one... but that's up to you. It'll certainly look awesome if you can make a design like that work. :D


Looks a bit like the JSB Predator, weird.

Image
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Unread postAuthor: wyz2285 » Sun Dec 05, 2010 5:39 pm

saefroch wrote:Sectional density. Want more sectional density in the front half. The way I understand it is if you decrease the inertia and increase the drag on one end, it's a lot easier for the projectile to pivot on its center of mass so the tail points back.
agreed. I will improve the design and take out some section density of the back. @JSR I did have in mind some similar ideas as that pellet when i designed it
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 16, 2011 8:44 pm

Just a heads up for those who really value accuracy and don't mind spending $100 on a barrel, these come in 2 foot lengths, in every established airgun calibre, with the choice of standard or polygonal rifling.
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Unread postAuthor: wyz2285 » Mon Jan 17, 2011 1:21 pm

Cool :D Thank you very much!!
And I have just received a lot of money form my birthday :D
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Unread postAuthor: Gippeto » Mon Jan 17, 2011 2:37 pm

Crosman barrels are still a better deal at $25. When carefully prepped, they deliver.

http://www.dlairgun.com/Crosman-Accessories.html
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