Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 44 users online :: 6 registered, 0 hidden and 38 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

HEAL 320psi 20mm copper cannon (now with damage videos)

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

Unread postAuthor: nivekatoz » Mon Nov 12, 2007 8:33 pm

You should use a aluminum barrel...You can get sch 80 pipe any lenght at ( onlinemetals.com) sch 40 3/4 in x2-3 feet long or sch 80.....
  • 0


nivekatoz
2nd Lieutenant
2nd Lieutenant
 
Posts: 237
Joined: Sat Nov 25, 2006 7:05 pm
Reputation: 0

Unread postAuthor: Zen/// » Mon Nov 12, 2007 8:48 pm

You should use a aluminum barrel...


Wtf why should he this gun is near perfect as is and a aluminum barrel will ruin it's "copperyness".

There is no known advantage of using a alumninum barrel over a copper one.

And aluminum is more expensive any way.

Online metals.com? plumbing supply.com? were your last two posts.

What are you? A spam Bot?
  • 0

User avatar
Zen///
1st Lieutenant
1st Lieutenant
 
Posts: 278
Joined: Sat Oct 27, 2007 3:49 pm
Location: In a foxhole sniping,Calgary, Canada
Reputation: 0

Unread postAuthor: VH_man » Mon Nov 12, 2007 8:59 pm

And aluminum is more expensive any way.


UMMM, explain to me why 10 feet of 2 inch copper is..... 150 bucks..........

aluminum is way cheaper.
  • 0

User avatar
VH_man
Major General
Major General
 
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Reputation: 1

Unread postAuthor: Ragnarok » Mon Nov 12, 2007 9:11 pm

Alas, I don't have the opportunity to order from the US. I live in England (That is England as in a part of Great Britain or the UK, not "New England") so I can't order cross atlantic
Still, copper works very well for this job, and I wouldn't want to change to an aluminium barrel - as Zen said, it would destroy the "balance" of the launcher.

@Zen: Near perfect? Bloody hell, I'm cooking on gas with this launcher - it's had a very good reception.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: Zen/// » Mon Nov 12, 2007 9:20 pm

aluminum is way cheaper.


WTF!!! I thought copper was cheaper!!!
I spent (a large amount of money) on my copper gun thinking that I was saving money over a aluminumm one!!!!!!!
  • 0

User avatar
Zen///
1st Lieutenant
1st Lieutenant
 
Posts: 278
Joined: Sat Oct 27, 2007 3:49 pm
Location: In a foxhole sniping,Calgary, Canada
Reputation: 0

Unread postAuthor: Solar » Tue Nov 13, 2007 4:14 pm

Aluminum is the most abundant metal in the entire universe. It had better be cheaper!
  • 0

User avatar
Solar
Colonel
Colonel
 
Posts: 512
Joined: Tue May 17, 2005 11:53 pm
Country: United States (us)
Reputation: 11

Unread postAuthor: spanerman » Tue Nov 13, 2007 4:17 pm

well its not :shock:
  • 0

Image

spanerman
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 438
Joined: Sun Sep 17, 2006 2:54 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: mtronic » Tue Nov 13, 2007 6:14 pm

This vid was awesome, made my day. Again, very nice work.
  • 0

Always out numbered....
never out gunned
User avatar
mtronic
1st Lieutenant
1st Lieutenant
 
Posts: 292
Joined: Sat Jun 23, 2007 6:21 am
Location: everywhere at once
Reputation: 0

Unread postAuthor: sandman » Tue Nov 13, 2007 6:16 pm

Solar wrote:Aluminum is the most abundant metal in the entire universe.
Actually lithium is if you want to get technical.
  • 0


sandman
Colonel
Colonel
 
Posts: 672
Joined: Thu Mar 15, 2007 6:59 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Tue Nov 13, 2007 8:13 pm

sandman wrote:Actually lithium is if you want to get technical.


Or is it iron ?
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: Zen/// » Tue Nov 13, 2007 8:28 pm

@Zen: Near perfect? Bloody hell, I'm cooking on gas with this launcher - it's had a very good reception.


Well saying it's nice/cool won't get us anything, since it's your launcher.
  • 0

User avatar
Zen///
1st Lieutenant
1st Lieutenant
 
Posts: 278
Joined: Sat Oct 27, 2007 3:49 pm
Location: In a foxhole sniping,Calgary, Canada
Reputation: 0

Unread postAuthor: Ragnarok » Tue Nov 13, 2007 10:41 pm

Well, compliments get you more videos... in fact, given the decent response, there will indeed be another one, but longer, more reliably edited, and with a bigger budget (The budget for the last one summed to a couple of quid for batteries for the camera, and a few rounds of ammo from my stash).
It's going to be a pretty comprehensive video, showing damage, penetration, accuracy, and a few other things.

I'll also do a couple of upgrades to HEAL to give it a little more power, as well as taking of those efficiency suggestions JSR sometimes has to their practical extremes. Dead space could be pinched slightly, and the piston and pilot volume might be adjusted a bit, which would also shorten the launcher slightly (gotta love soldered copper. Couldn't do half of the changes with cemented PVC) - time to really earn that "High Efficency".

Expect the video in the fortnight leading up to Christmas.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: MrCrowley » Wed Nov 14, 2007 2:49 am

Personally I think you should get rid of the ball valve on the barrel, with your other safety, you don't really need it.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: Ragnarok » Wed Nov 14, 2007 5:55 am

I've had the suggestion before, but I take safety seriously, and it doesn't have any real negative impact on performance - so I'm not one to risk an accident.
The other safety is useful, but the barrel safety is the only one I can be sure will absolutely 100% stop the launcher firing when I don't want it to. There are other problems that might arise that the trigger safety will have no control over.

There are however other improvements I can make in that area...
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: Ragnarok » Wed Nov 21, 2007 11:11 am

More talking about planned changes to HEAL I'm afraid, however they're good ones.

I can work on valve flow, piston design, pilot volume and dead volume a little, but this will do only so much.

The pilot volume and dead volume are already pretty good - there is some work that can be done, not much though without major changes that would affect other things. These changes only equate to relatively small amount more power, maybe a couple of percent.
The valve flow can be improved. It's better than any other valve I've made in this size, but I believe I can still get more and cleaner flow through the valve. This is the main improvement I can make in the valve area, and hopefully it would add a significant few percent to power.
Piston design needs to remain largely unchanged, but I may be able to decrease back flow a little more, and trim a tiny amount off the weight.

Still, all these changes are small game, only adding so much, as I spent quite enough time before working on things like this to get them good in the first place.
The big change I'm hoping to make is a transition up to 25 bar (360psi) pressure, rather than the 21 bar (305 psi) I normally work at (22 bar [320 psi] is possible, but very hard to achieve). I have a plan to get the pressure from a 120 psi compressor - I'll say more later.

With the extra pressure and the changes, HEAL should be able to give a lot more than it already does. I'm still a long way short of 4 figure muzzle energies, but to get 1000J (let alone 1000 ft-lbs.) with a hand-held cannon in a low bore size would be nigh on impossible.

I'll also make some longer (but less portable) barrels for really blasting something.

Any thoughts?
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

PreviousNext

Return to Pneumatic Cannon Database

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'