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 53 users online :: 5 registered, 0 hidden and 48 guests


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

Registered users: Bing [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

RPG (not dungeons and dragons you nerd)

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
Sponsored 
  • Author
    Message

Unread postAuthor: psycix » Fri May 16, 2008 5:02 am

I think you wont need a heat shield, its basically a combustion gun with water in the barrel. You dont need a heatshield for that too, unless you are going to stand in front of it.
Dont expect this construction to be powerfull. Combustion doesnt grant very much pressure and secondly, it lasts a short time.
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: magnum9987 » Fri May 16, 2008 2:05 pm

ok, their is no water. and secondly did you understand the scale I am building here? I said I'm building the combustion chamber to 5in diameter. I'm planning on using a huge volume of gasses and I do think the back blast could be harmful, just like standing too close to the barrel of a gun going off gives you powder burns.
  • 0

http://www.spudfiles.com/forums/viewtop ... Revolution in the absolute is not initiated by swords, guns, and bullets, but by words-
The New RobesPierre
User avatar
magnum9987
1st Lieutenant
1st Lieutenant
 
Posts: 274
Joined: Wed May 07, 2008 5:02 pm
Reputation: 0

Unread postAuthor: psycix » Sat May 17, 2008 2:49 pm

5 in? thats not "that" big
Ofcourse you should keep distance but doing so with common sense is enough.


No water? that means even less thrust!
Expect it to jump up a few feet, and then come down again...
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: magnum9987 » Sat May 17, 2008 6:41 pm

How is it going to combust with water down the gas shaft?
Plus I've seen kids playing with weak nerf launcers that use the same concept as mine and achieve distances up to 30 feet, plus the projectile weighed nearly 12 ounces, while the bottle I plan on launching is significantly lighter, and the pressure in mine is sure to be greater.
  • 0

http://www.spudfiles.com/forums/viewtop ... Revolution in the absolute is not initiated by swords, guns, and bullets, but by words-
The New RobesPierre
User avatar
magnum9987
1st Lieutenant
1st Lieutenant
 
Posts: 274
Joined: Wed May 07, 2008 5:02 pm
Reputation: 0

Unread postAuthor: Ultimate Weapon » Sun May 18, 2008 1:08 am

To be blunt and honest, magnum your idea (and you) are retarded and it will NOT work. Someone had to say it cause it's true.
  • 0


Ultimate Weapon
Private
Private
 
Posts: 15
Joined: Fri Feb 15, 2008 1:22 am
Reputation: 0

Unread postAuthor: daxspudder » Sun May 18, 2008 3:42 am

to be 100% honest, this is a really dumb post. i would rather read the "how tall are you" crap than this... if your gonna stand near the front of your gun magnum you deserve to get burned, and from the apparent degree of your intelligence you should skip the part where you build the gun and just soak yourself in gas and light a cigarette[/flame]

saying "hows it gonna combust with water down the gas shaft"(wtf is a "gas shaft") is like saying how does a gun shoot with lead in the barrel... its all about how smart you are, the collective you that is.

EDIT: i just reread your original post. okay all you doing is building a tiny spud gun with a cork in the barrel as ammo, then your putting a empty tank on the end that you incorrectly call a chamber, i think your idea will only shoot 20-30 feet at best, and there is no way in hell you could possibly get flash back from it, not unless your using o2 which would be entirely stupid in and of itself
  • 0

User avatar
daxspudder
Captain
Captain
 
Posts: 300
Joined: Thu Apr 24, 2008 10:22 pm
Reputation: 0

Unread postAuthor: psycix » Sun May 18, 2008 7:00 am

magnum9987 wrote:How is it going to combust with water down the gas shaft?
Plus I've seen kids playing with weak nerf launcers that use the same concept as mine and achieve distances up to 30 feet, plus the projectile weighed nearly 12 ounces, while the bottle I plan on launching is significantly lighter, and the pressure in mine is sure to be greater.


Well, very simple, you inject fuel, let it mix, and spark the ignitor.
It combusts.

Ever blank fired a normal combustion gun and felt the "recoil"?
This is the amount of force your rocket will get, and it will not be enough.

Try it out yourself. Grab a random combustion, put a rag in the barrel, fuel, mix, point barrel down and dont hold it. Set it against a tree or something.
It wont fly.
If your lucky it will jump a few inch from the ground and then fall over.

PVC is too heavy for this all, and if you are using lighter stuff, its not safe (you planning to use DWV bad boy?)
The size doesnt matter.

A "rocket" twice as large may have twice the propulsion force, but it also weighs twice the amount, so it wont come very far.

This idea of you may have seemed nice to you, but it will not work as planned. Accept that.
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: magnum9987 » Fri May 30, 2008 3:57 pm

First of all, That was uncalled for/.
Second I mean that the water would just go down the barrel and flow into the chamber (Which i will continue to call it god damn it!). So the presence of water is redundant.
THe chamber has a greater volume than the half liter water bottle, much more. The gases inside the chamber will go to the bottle. Water rockets take air pressure and because of the property of water (It doesn't expand) the air pressure pushes water out with a delay.

But i do realize with out water this could not work. So i'll turn it from an RPG to a mortar of sort. THe bottle would point upwards. A pipe comes out at a 90 degree angle then turns up for about 10 inches. Turns 90 degrees again and again and the chamber is 10in tall and 5 inches in diameter.
Because it goes vertical, it allows for water to be kept in the gun and allows for a necessary power increase.
  • 0

http://www.spudfiles.com/forums/viewtop ... Revolution in the absolute is not initiated by swords, guns, and bullets, but by words-
The New RobesPierre
User avatar
magnum9987
1st Lieutenant
1st Lieutenant
 
Posts: 274
Joined: Wed May 07, 2008 5:02 pm
Reputation: 0

Unread postAuthor: magnum9987 » Wed Jun 04, 2008 2:25 pm

Update of idea
Screw the mortar part. Instead i'll make it into a sort of rpg again. This time, the bottle itself is the chamber. A cork of some sort with a bbq ignitor plugs the neck. Their is a shaft that will put some distance between the shooter and the round, as well as a heat shield.

Another Idea
HUGE chamber: 8in diameter, 20in long. The bottle is attached directly to the bottle. An additional pipe stems out from a certain point that goes around the bottle, which will keep gases in a safe area.
  • 0

http://www.spudfiles.com/forums/viewtop ... Revolution in the absolute is not initiated by swords, guns, and bullets, but by words-
The New RobesPierre
User avatar
magnum9987
1st Lieutenant
1st Lieutenant
 
Posts: 274
Joined: Wed May 07, 2008 5:02 pm
Reputation: 0

Previous

Return to Combustion Cannon Discussion

Who is online

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

Reputation System ©'