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Crowley's First Co-ax - Update

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 04, 2008 3:40 am

Not bad at all, think what you could do if you fitted a cheapo 4x20 sacope ;)
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Unread postAuthor: MrCrowley » Fri Apr 04, 2008 3:50 am

jackssmirkingrevenge wrote:Not bad at all, think what you could do if you fitted a cheapo 4x20 sacope ;)

<A HREF="http://www.trademe.co.nz/Sports/Hunting-shooting/Scopes-mounts/Scopes/auction-148340016.htm">Way ahead of you, buddy</a> :D

I have don't have a whole lotta money to spend and that's the best scope I could find for a cheap price that I could get quickly.


I'm planning on a 12" 3/4" metal chamber, 24" 6mm barrel and at least 250psi :D

I'll mount it on a rifle stock with the scope too :)


I also bought some .224" bullets as they fit quite well. I got two types, 10 each:
Image
I got the #1455's Blitzkings and the JLK's Very Low Drag.

With testing at 5m, the blitzkings fly pretty damn straight, little tumble. The JLK's tumble quite a bit. But I was planning on using them for close up penetration shots :)


I've also got some .303's lying about, just the projectiles. Comparing them to the .224's is pretty much comparing the US M4A1's 5.56mm round to the AK's 7.62mm, big difference.


Edit: Oh and before anyone goes off at me for the scope, it's just for aesthetics really, and overall coolness 8)

And the bullets are just for fun, I doubt they'll penetrate anything a great deal, but it's a good story to tell friends :)
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 04, 2008 3:57 am

That's actually quite expensive compared to the prices you normally find such scopes at, but of course things in Kiwiland are different.

Do the bullets have an exposed lead base? If so, it should be fairly easy to drill a consistent 3.5mm diameter hole in the base to move the CG forward and cut down on tumble. For the same reason, avoid hollow/fibre tipped rounds. As regards to performance, as I've always said, for smaller calibres you do need pressures beyond 200 psi to get good results.
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Unread postAuthor: MrCrowley » Fri Apr 04, 2008 4:01 am

Yeah prices aren't exactly the best here.

With my .303 rounds they're tracer, so the base is open and filled with tracer stuff. I drilled a 3.5 or 4mm hole down it and removed all the tracer stuff and it did make a decent difference in flight.

Of course I drilled out the tracer compound after taking a blow-torch to it and having a burning red firework in my garage :D

Edit: Oh and the ROF of this thing is about 15 rounds a minute if I rushed, 10 on average. Because my blowgun has a backup side pilot, a small button, I can keep the QC connected.

I hold the trigger to fill the gun, muzzle load, then fire with the button on the side, which moves the gun less then if I used the trigger :)

Rinse, and repeat :roll:
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 04, 2008 4:05 am

Another option would be to epoxy a length of wooden dowel or something like a 6mm rollies filter to the base of the bullet, in the same style of the lead nose/fibre tail pioneered by Brenneke.

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Unread postAuthor: MrCrowley » Fri Apr 04, 2008 4:10 am

Yeah that would work too.

This is just going to be my plinker until I save up for a Gamo.
I've been looking at auctions for awhile and they're all pretty much the same brand.

So for a 1000fps air rifle, in .177 or .22 for around $350, what do you think is a goods brand to get aside from Gamo?

http://www.trademe.co.nz/browse/categor ... price_desc
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 04, 2008 5:39 am

Can you get 0.22 airgun pellets? If so, this might be a better idea for ammunition ;)

As to what what brand, you seem to be fairly limited in NZ. Norica and Gamo are Spanish while Hatsan is Turkish, neither are particularly well known for quality rifles. I would recommend something from Weihrauch (or the US Beeman clones of their models), RWS, Diana, Air Arms or BSA. These would probably be out of your budget new but a good second hand model would be just as good, rifles from the mentioned brands tend to be overengineered and if well cared for will last for several generations.
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