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 72 users online :: 5 registered, 0 hidden and 67 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

the big bang

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

Unread postAuthor: shud_b_rite » Thu Jul 19, 2007 11:47 pm

MrCrowley wrote:
I had jeans and a hoody on so I was well protected.


Lol, yea mate thats the kiwi way, I bet you had jandals on too. Who needs proper safety gear anyway.

Na talking seriously now, I would atleast wear glasses and maybe even a cup, even if it was wrapped in 2 blankets and underwater. But depending on how deep you sink it you probably wont need them.
  • 0

Airbeds... so many different uses
User avatar
shud_b_rite
1st Lieutenant
1st Lieutenant
 
Posts: 290
Joined: Tue Jan 30, 2007 7:10 pm
Location: Auckland, New Zealand
Reputation: 0

Unread postAuthor: Pilgrimman » Fri Jul 20, 2007 2:01 am

The water ought to be sufficient for absorbing force. As water can't be compressed, it takes a lot of force to move it. Lift a 5 gallon bucket of water. That's pretty heavy, huh? Short of a solid fuel explosion, no amount of air pressure will blast water around in a dangerous fashion.
  • 0

User avatar
Pilgrimman
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 481
Joined: Thu Jun 28, 2007 1:10 pm
Location: Grants Pass, OR
Reputation: 0

Unread postAuthor: Redcoat » Fri Jul 20, 2007 3:39 am

That sounds AWESOME!! :headbang: :headbang: :headbang: :headbang: :headbang: just make sure you take the cannon back out of the water so we can see what happened to it.would be interesting i guess. :D
  • 0

Poo.
User avatar
Redcoat
Brigadier General
Brigadier General
 
Posts: 836
Joined: Tue Feb 13, 2007 1:07 am
Location: Sydney ,Australia
Reputation: 0

Unread postAuthor: frankrede » Fri Jul 20, 2007 4:47 am

Pilgrimman wrote:The water ought to be sufficient for absorbing force. As water can't be compressed, it takes a lot of force to move it. Lift a 5 gallon bucket of water. That's pretty heavy, huh? Short of a solid fuel explosion, no amount of air pressure will blast water around in a dangerous fashion.

What about a pressure washer?
Those are deadly!
ha
  • 0

Current project: Afghanistan deployment
User avatar
frankrede
Lieutenant General
Lieutenant General
 
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Reputation: 0

Unread postAuthor: spudbud101 » Fri Jul 20, 2007 4:59 am

Awesome! At least give us a good quality video.
  • 0

Rawr.
User avatar
spudbud101
Sergeant First Class
Sergeant First Class
 
Posts: 138
Joined: Wed Jun 28, 2006 11:35 pm
Location: Colorado
Reputation: 0

Unread postAuthor: Pilgrimman » Fri Jul 20, 2007 1:02 pm

@frankrede

Pressure washers use a lower volume of water, don't they? So they take less force to propel water at lethal velocity. Although I've heard stories of people who have hit their hand, and the skin got punctured, and their hand literally ballooned with water! :shock:
  • 0

User avatar
Pilgrimman
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 481
Joined: Thu Jun 28, 2007 1:10 pm
Location: Grants Pass, OR
Reputation: 0

Unread postAuthor: spudthug » Fri Jul 20, 2007 2:05 pm

dude if you sink this thing under water you arent even going to hear it..it will go fwoomp and a bunch of huge bubbles will come up...

beleive me ive done things like this before.. i got a 4 inch peice of pipe and two endcaps.. i glues it together tapped a 1/4 hole through the endcap. i hooked a hose up to the quarter inch hole and put my remote coil on the other end.. i tied like 5 huge ass rocks to it and threw it in my fishing hole (6-8 ft deep). i let the c02 rip full pressure and it took about 3 seconds to explode...all that happenned wass a fwoooomp and a crap load of bubble...the plastic came up in like 50 million pieces and floated down stream..
  • 0

4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
User avatar
spudthug
Brigadier General
Brigadier General
 
Posts: 936
Joined: Mon Feb 26, 2007 9:02 pm
Location: johnsonburg, Pa USA
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: SpudBlaster15 » Fri Jul 20, 2007 2:17 pm

If you suspend it about one foot below the surface of the water, and replace the sprinkler valve with a PVC plug, you should get a nice bang and a blast of water.
  • 0

People should not be afraid of their governments. Governments should be afraid of their people.
User avatar
SpudBlaster15
Major General
Major General
 
Posts: 2385
Joined: Wed Oct 18, 2006 11:12 pm
Location: Canada
Country: Poland (pl)
Reputation: 3

Unread postAuthor: spudbud101 » Fri Jul 20, 2007 3:01 pm

Just suspend it over the lake.
  • 0

Rawr.
User avatar
spudbud101
Sergeant First Class
Sergeant First Class
 
Posts: 138
Joined: Wed Jun 28, 2006 11:35 pm
Location: Colorado
Reputation: 0

Unread postAuthor: lukemc » Fri Jul 20, 2007 3:10 pm

you wont get an accurate result. you have to compensate for the water pressure on the pipe. did any one see the mythbusters episode where they droped a grenade in a bucket of water to see if it supressed the result? it worked very well the water slowed the grenade frags considerably

here is a water pressure calculator. link

at 6 feet there is about 17 psi or pressure on the pipe
  • 0

"Those who are different change the world. Those who are the same keep it that way"
User avatar
lukemc
Colonel
Colonel
 
Posts: 565
Joined: Sun Feb 25, 2007 8:48 am
Location: NY
Reputation: 0

Unread postAuthor: MrCrowley » Fri Jul 20, 2007 5:33 pm

He just wants to see at what pressure it expoldes at right... So by having 17PSI of pressure on the outside of the gun when submerged is that going to effect the pressure the gun explodes at?
  • 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: Gepard » Fri Jul 20, 2007 5:36 pm

Yes......of course it will.........

Michael
  • 0


Gepard
Captain
Captain
 
Posts: 342
Joined: Mon Jun 18, 2007 11:12 am
Reputation: 0

Unread postAuthor: DYI » Fri Jul 20, 2007 5:45 pm

I think that if it was under 6 feet of water it should burst at 17 psi higher than it would if it wasn't in water. Taking the burst pressure and subtracting 17 shouldn't be too difficult, and the water adds a lot of safety. Suspending it over the lake would kind of defeat the purpose of sinking it in the first place, wouldn't it?
On a side note, the concept of the water jet cutter illustrates how almost anything that is moving quickly enough can do significant damage. (and have you ever seen a light gas gun firing miniscule chunks of plastic at inch thick aluminum plate?)
  • 0

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: lukemc » Fri Jul 20, 2007 6:52 pm

the the 17 psi pressure on the outside will effect the burst pressure... by 17 psi so just subtract
  • 0

"Those who are different change the world. Those who are the same keep it that way"
User avatar
lukemc
Colonel
Colonel
 
Posts: 565
Joined: Sun Feb 25, 2007 8:48 am
Location: NY
Reputation: 0

Unread postAuthor: Hailfire753 » Fri Jul 20, 2007 7:16 pm

Just suspend in balistics gel! :lol:

Actually, you could make a wood box, but replace one side with bullet-proof glass. ....Or, just a couple sheets of clear plastic you can find at home depot. Of course, this is a lot less safe, but you would get an accurate test, and a BIIIG explosion!

....Orrrrr you could take your gun to a clear field, attach the compressor to a reaaally long extension cord, and sit behind a clear plastic sheet, with the camera. Then, just plug in your extension cord, film, and wait.

...Or a cross between the box and empty field methods
  • 0

UPDATED MARCH '08
field-legal paintball semi
User avatar
Hailfire753
Captain
Captain
 
Posts: 348
Joined: Thu Jun 28, 2007 11:50 pm
Location: Near Philadelphia, PA
Reputation: 0

PreviousNext

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'