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 43 users online :: 3 registered, 0 hidden and 40 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

tell me if this sounds like a good idea

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

tell me if this sounds like a good idea

Unread postAuthor: tater36 » Wed Apr 04, 2007 6:56 pm

Okay im gonna build a first combustion spud gun and im wondering if these specs sound good, a 4-5 foot ish barrel of 2" and a about 1' chamber of 3", a BBQ igniter for ignition and whatever i can get at a dollar store that will work for fuel. open to any suggestions that may make it better cause i havent got any parts yet! :D
  • 0

User avatar
tater36
Private First Class
Private First Class
 
Posts: 30
Joined: Tue Mar 27, 2007 9:02 pm
Reputation: 0

Unread postAuthor: hi » Wed Apr 04, 2007 7:01 pm

You would need about a 2 foot 3'' chamber or it wouldn't have enough power to push the tater out the barrel. you could have 1 1/2 foot 4'' chamber. other than that, ya it sounds good, thats about the size of mine.
  • 0

User avatar
hi
Major General
Major General
 
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm
Reputation: 0

Unread postAuthor: lukemc » Wed Apr 04, 2007 7:05 pm

the barrel would be a bit long because for a good Chamber:barrel ratio should be optimal .8:1 but for a nice muzzle flash and big bang a 1:1 works nice. so you could make your chamber longer or your barrel shorter.

nextly add a chamber fan they make it so much easier to clean the chamber so you dont have to run around with a spud gun over your head just to clean the chamber after shots and it also mixes fuel better resulting in a faster combustion that way it reaches peak pressure while the projectile is still i the barrel.

finaly make sure you put some kind of netting (wire of some kind) inbetween the chamber and barrel so projectiles like ice or something you drop into the barrel by mistake dosent fall into the chamber crushing the chamber fan
  • 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: subterranean » Wed Apr 04, 2007 7:08 pm

use the 1.5:1 c:b ratio by vloume

volume of a cylinder : pi x r^2 x hieght(length)
  • 0

User avatar
subterranean
Master Sergeant
Master Sergeant
 
Posts: 171
Joined: Sat Oct 21, 2006 11:39 am
Location: columbus, ohio
Reputation: 0

Return to Combustion Cannon Discussion

Who is online

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

Reputation System ©'