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 70 users online :: 4 registered, 0 hidden and 66 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Mile shooting cannon?

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

Unread postAuthor: Gun Freak » Mon Mar 29, 2010 8:39 pm

Do a little research on the wiki.
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: saefroch » Mon Mar 29, 2010 8:41 pm

You can find plans for pneumatics just searching around on the internet. I have a good engineering brain and have figured out how to build a hybrid, combustion-piloted piston hybrid, REAL piston hybrid, and normal metered combustion. I have not the resources to build much beyond what I have which is a simple pneumatic. If you can demonstrate that you have the common sense and respect for high-powered spudguns, I know that there are those who will help you out with diagrams, plans, supply lists and the like.
  • 0

User avatar
saefroch
Major General
Major General
 
Posts: 1679
Joined: Mon Jun 08, 2009 8:47 am
Location: U.S.A.- See Map
Country: United States (us)
Reputation: 0

Unread postAuthor: DYI » Mon Mar 29, 2010 8:59 pm

Depending on what you have access to, this bet could easily cost more than $500 to win, and would result in a heavy, awkward, loud cannon that would be rather expensive to operate. Also, good luck hitting close enough to the target area to see the splash with binoculars...

To start you on your quest, the cheapest way to do it is with a high pressure pneumatic using a rupture disk valve. In the long run, a hybrid would be cheaper due to its lack of reliance on expensive compressed gases.
  • 0

Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
User avatar
DYI
Lieutenant General
Lieutenant General
 
Posts: 2861
Joined: Sat Jul 07, 2007 8:18 pm
Location: The People's Republic of Canuckistan
Country: Turks and Caicos Islands (tc)
Reputation: 9

Unread postAuthor: reedfe » Mon Mar 29, 2010 9:14 pm

ok so i've read up on burst disks and unions but i'm still not understanding it. can you clarify on how a union works?
  • 0

User avatar
reedfe
Corporal
Corporal
 
Posts: 78
Joined: Wed Feb 03, 2010 9:00 pm
Reputation: 0

Unread postAuthor: Moonbogg » Mon Mar 29, 2010 9:14 pm

A .22 rifle can travel over a mile I thought. But about the spud gun, yeah man, check it out...immagine a cannon with enough force to send something that far, then immagine it failing upon ignition. What you have is a HUGE hand grenade. I would go with a large burst disc hybrid made out of high strength steel and remote detonate it from about 50 yards away behind a blast shield. It would have to be large and high mix. Thats very dangerous and would have to cost a decent penny to be anywhere near safe. Will your dad hire an engineer and pay the money to have it manufactured just to lose a bet? I doubt it.
  • 0

User avatar
Moonbogg
Major General
Major General
 
Posts: 1375
Joined: Mon Oct 13, 2008 10:20 pm
Location: whittier, CA USA
Reputation: 0

Unread postAuthor: reedfe » Mon Mar 29, 2010 9:16 pm

lol so this idea is impractical, expensive, and unsafe. i don't like the sound of that
  • 0

User avatar
reedfe
Corporal
Corporal
 
Posts: 78
Joined: Wed Feb 03, 2010 9:00 pm
Reputation: 0

Unread postAuthor: Moonbogg » Mon Mar 29, 2010 9:21 pm

reedfe wrote:lol so this idea is impractical, expensive, and unsafe. i don't like the sound of that


Now you're thinking.

EDIT: There is no reason you can't still build something totally impressive. Don't do it on a bet. It will motivate you to go beyond your comfort zone and you could end up with a magnificent FAIL.
  • 0

User avatar
Moonbogg
Major General
Major General
 
Posts: 1375
Joined: Mon Oct 13, 2008 10:20 pm
Location: whittier, CA USA
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: DYI » Mon Mar 29, 2010 9:43 pm

A .22 rifle can travel over a mile I thought. But about the spud gun, yeah man, check it out...immagine a cannon with enough force to send something that far, then immagine it failing upon ignition. What you have is a HUGE hand grenade. I would go with a large burst disc hybrid made out of high strength steel and remote detonate it from about 50 yards away behind a blast shield. It would have to be large and high mix. Thats very dangerous and would have to cost a decent penny to be anywhere near safe. Will your dad hire an engineer and pay the money to have it manufactured just to lose a bet? I doubt it.



Speaking of hand grenades, a modern one would be 500kJ to 1MJ energy, released in microseconds, generating millions of psi shock pressure, and specifically designed to throw fragments.

Compare to this thing, running perhaps 50kJ potential energy stored in a relatively low pressure gas, or generated by combustion reaching one or two thousand psi in several milliseconds. The energy density is vastly lower, and the (much more malleable) container's mass considerably greater. So it's more like a TINY hand grenade, with the fragments removed and the RDX replaced with black powder.

With a decent SCH 80 seamless steel body and appropriate fittings, a 1 mile pneumatic or hybrid is no more of a threat than a properly maintained water heater, so long as you don't stand downrange :roll: .

The real threat is that of wasting time and money by pushing forward on a project beyond one's abilities. As Moonbogg said, build something more "practical" to get you started. See where it goes from there.
  • 0

Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
User avatar
DYI
Lieutenant General
Lieutenant General
 
Posts: 2861
Joined: Sat Jul 07, 2007 8:18 pm
Location: The People's Republic of Canuckistan
Country: Turks and Caicos Islands (tc)
Reputation: 9

Unread postAuthor: POLAND_SPUD » Mon Mar 29, 2010 10:01 pm

I would say that it is possible... I ggdted a simple burst disk gun built from 1.75" pipes... at 400 psi, with a 150cm long chamber, 500 cm long barrel you can achieve over 1 km with 0.5kg projectile

you could probably get much more with the use of a sabot...
but yeah as DYI has pointed out it is very far form being practical
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: deathbyDWV » Mon Mar 29, 2010 11:04 pm

I would suggest something like my big pneumatic...
http://www.spudfiles.com/forums/4in-coaxial-cannon-updatestand-t18237.html

At 100psi you should get nearly 1/2 mile with a bouncey ball. More with a dart (which I've never done) but I think you'd get nearly 3/4 mile...
  • 0

Life's too short to mark off the items on your wish list...
User avatar
deathbyDWV
Colonel
Colonel
 
Posts: 576
Joined: Sat May 16, 2009 4:02 pm
Location: Owasso, OK
Reputation: 2

Unread postAuthor: Moonbogg » Mon Mar 29, 2010 11:52 pm

DYI wrote:
A .22 rifle can travel over a mile I thought. But about the spud gun, yeah man, check it out...immagine a cannon with enough force to send something that far, then immagine it failing upon ignition. What you have is a HUGE hand grenade. I would go with a large burst disc hybrid made out of high strength steel and remote detonate it from about 50 yards away behind a blast shield. It would have to be large and high mix. Thats very dangerous and would have to cost a decent penny to be anywhere near safe. Will your dad hire an engineer and pay the money to have it manufactured just to lose a bet? I doubt it.



Speaking of hand grenades, a modern one would be 500kJ to 1MJ energy, released in microseconds, generating millions of psi shock pressure, and specifically designed to throw fragments.

Compare to this thing, running perhaps 50kJ potential energy stored in a relatively low pressure gas, or generated by combustion reaching one or two thousand psi in several milliseconds. The energy density is vastly lower, and the (much more malleable) container's mass considerably greater. So it's more like a TINY hand grenade, with the fragments removed and the RDX replaced with black powder.

With a decent SCH 80 seamless steel body and appropriate fittings, a 1 mile pneumatic or hybrid is no more of a threat than a properly maintained water heater, so long as you don't stand downrange :roll: .

The real threat is that of wasting time and money by pushing forward on a project beyond one's abilities. As Moonbogg said, build something more "practical" to get you started. See where it goes from there.


The point is if you are close to a failing chamber like that, or even if an end cap blows off, it might as well be a hand grenade because you can be just as dead.
  • 0

User avatar
Moonbogg
Major General
Major General
 
Posts: 1375
Joined: Mon Oct 13, 2008 10:20 pm
Location: whittier, CA USA
Reputation: 0

Unread postAuthor: Technician1002 » Tue Mar 30, 2010 1:27 am

I've tried to range test golf balls, but I can never find them. I need to get some with some sort of homing beacon in them. This summer I am planning on drilling a few to add LED lights or mini glow sticks for some night tracking and retrieval. With a GPS, I'll be able to get some better distance measurements with golfballs.

Apples that don't explode on launch are good for about 600 feet. They are not as aerodynamic as golf balls.
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: CpTn_lAw » Tue Mar 30, 2010 2:45 am

I've shot a 30" arrow at 6x with the hybrid, in a 1,5 ft barrel, horizontal shot. (saboted) It did fly fast, actually we didn't see it , but about half a second later, it landed 150 meters downrange in the water. Now, HGDT gives almost 60% more initial speed with a 3 feet barrel. The recoil was quite noticeable though.... I have a video i'll edit right away of a similar shot, at 5x, with heavier arrow.

I think one mile is possible, with a good angle, an arrow, and a high power spudgun, either pneumatic or hybrid.
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Unread postAuthor: Ragnarok » Tue Mar 30, 2010 12:36 pm

D_Hall wrote:It's not that bad... There are several golf ball launchers on this site that should be able to do on the order of 1/3ish mile...

Several?

Mathematically speaking, a golfball needs to be pulling about 500 m/s at the muzzle in order to be capable of the ~536 metres that equates to.
I know there are a handful of golfball hybrids that are up to that velocity, but they're not exactly numerous.

Any of them could do a 1/2 mile+ with a saboted dart (I'd even lay money on a full mile but until I study the problem I'm just going with my gut, nothing more).

Quite easily. Although I never intend to do it because of how dangerous it is, I've got a prototype dart on my desk that would come down about three miles away if I fired it for distance - and that's from a far less powerful launcher.

Any golfball launcher that had the power to put a golfball a 1/3rd of a mile could easily put a good saboted dart five miles or more.
  • 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: Gippeto » Tue Mar 30, 2010 1:24 pm

Ragnarok wrote:... I've got a prototype dart on my desk that would come down about three miles away if I fired it for distance - and that's from a far less powerful launcher.
.


How about a picture then? :)
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

PreviousNext

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'