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 60 users online :: 2 registered, 0 hidden and 58 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

"In the world of spuds today"

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

Unread postAuthor: BigGrib » Sat Feb 23, 2008 6:54 pm

In the world of Spuds today, I've been thinking about making another advanced combustion, just to have another one around, but while I was being impatient I accidentally glued the 4 to 2 bushing in the coupler backwards and before I could do anything about it, the glue had set enough to where i couln't get it out. So that got me thinking and rather than throw away 6 bucks i decided to make it a co-axial launcher.

The only modification I'm going to have to do is hone the lip on the bushing out. I was planning on making it another camlock setup so I can interchange barrels but then that would kind of take away from the coaxial aspect of it unless I sleeve a GB barrel into the sch80 2". I was however wondering when making a co-axial combustion how do you support the barrel on the inside or do you just let it fly. my reason for this is that the barrel is gonna stick out at least 3 to 4 feet from the chamber and I dont want that extra weight screwing something up and tweaking it.
  • 0

Yea, that's definitely going to get you at least a tazer.

<a href="http://www.youtube.com/watch?v=AkMkGOpAF4s">DONT TAZE ME BRO.. DONT TAZE ME... AHHHH</a>
facebook.com/biggrib
User avatar
BigGrib
Colonel
Colonel
 
Posts: 652
Joined: Mon Oct 01, 2007 11:43 pm
Location: TriCities, WA
Reputation: 0

Unread postAuthor: DYI » Sat Feb 23, 2008 7:15 pm

In the world of spuds today, I tested 24 layer 2" alu. foil burst disks, which burst exactly when they were supposed to, at 160 psi. I have a video (as always, I document every firing of the SCTBDC), but it's nothing more exciting than 55 seconds of waiting followed by a loud boom and the camera falling over, so I'm not going to post it.
  • 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: Novacastrian » Sat Feb 23, 2008 7:20 pm

All of my co-ax's have no support for the barrel on the inside of the chamber, apart from my clear pneumo. *Goes to find pic*

Image

I suggest supporting it like this (look at the front of the chamber).
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: A a r o n » Sun Feb 24, 2008 1:48 am

In the world of spuds today...

Image


golfball gun time.
  • 0

User avatar
A a r o n
Specialist
Specialist
 
Posts: 55
Joined: Sat Jul 07, 2007 3:23 pm
Location: NJ
Reputation: 0

Unread postAuthor: Novacastrian » Sun Feb 24, 2008 2:06 am

A a r o n wrote:In the world of spuds today...

Image


golfball gun time.


That valve looks spectacular, don't you screw it up now- the valve gods will hurt you.
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: A a r o n » Sun Feb 24, 2008 2:28 am

I promise I won't screw it up. It's too beautiful to damage.




SDR 21 1.5" and Sch 40 1.5" have the same OD right?
  • 0

User avatar
A a r o n
Specialist
Specialist
 
Posts: 55
Joined: Sat Jul 07, 2007 3:23 pm
Location: NJ
Reputation: 0

Unread postAuthor: jook13 » Sun Feb 24, 2008 3:00 am

in other news I tried to make a piston valve for the first time. it was very un-impressive, but it still works... shoots about 18 feet at the most (at 250 psi). But, its a learning process, right?

All the jb weld is from when I tried to take it apart and fix it. Now it shoots the same as before and leaks.... :x :(
Image
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: MrCrowley » Sun Feb 24, 2008 3:06 am

That looks like a very weak JB-Weld mix, did you mix the portions evenly?

Also I find it best to leave JB-Weld to dry for atleast a week for it to reach full strength, nevermind the 24hours recommendation. How long did you leave yours?

JB-Kwik dries full strength within 24hours, so use that if you're impatient.
  • 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: jook13 » Sun Feb 24, 2008 3:10 am

sorry... I realised that it wasnt jb weld. That is an epoxy I had around the house. I know jb weld turns out much darker than that... my mistake, I use so much of each that I got confused...

I guess the point of my post was the gun wasnt worth starting a thread over but I wanted to show that I am trying pistons. I will get it right eventually (soon).
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: MrCrowley » Sun Feb 24, 2008 3:14 am

It is a small gun, what were you trying to shoot?
  • 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: jook13 » Sun Feb 24, 2008 3:19 am

a small 1/4 inch thick piece of potato. It didnt seem right because way more air left the schrader than the barrel when I triggered it. I had a small pilot volume (piston travels about 3/16 of an inch). I am guessing that the piston wasnt tight enough so too much air got around it.
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: MrCrowley » Sun Feb 24, 2008 3:22 am

Your piston must be too loose of a fit in the pipe, lacking lubricant or is getting jammed up a bit, or all three.
  • 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: jook13 » Sun Feb 24, 2008 3:24 am

yeah, It is plenty lubed, so I think its one of or both of the other two. oh well, I am only out like 15 bucks. and I learned a lot.
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: Hubb » Sun Feb 24, 2008 5:02 am

Some of my news:

I found that if you grind a lid to a Gatorade bottle, it fits perfectly in a 1 inch union and makes for a helluva burst disk. To seal, simply put a layer of teflon around the grinded lid.

I've also found that lots of my friends are more than willing to give me there Gatorade lids (I have about 50 so far).
  • 0

User avatar
Hubb
Major General
Major General
 
Posts: 2390
Joined: Mon May 28, 2007 8:39 am
Location: South Georgia
Reputation: 2

Unread postAuthor: DYI » Sun Feb 24, 2008 10:18 am

What pressure does it burst at in a 1" union? The only problem I can see arising is that while you can simply buy 100' rolls of aluminum foil, you have to get Gatorade lids from Gatorade bottles.
  • 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

PreviousNext

Return to General Spud Cannon Related

Who is online

Registered users: Bing [Bot], Yahoo [Bot]

cron
Reputation System ©'