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 38 users online :: 5 registered, 0 hidden and 33 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

chamber:barrel ratio?

Discuss miniature cannons built from things such as pill bottles and pen caps.
Sponsored 
  • Author
    Message

chamber:barrel ratio?

Unread postAuthor: JDP12 » Sat Apr 14, 2007 4:16 pm

Just wondered if anyone actually uses a chamber to barrel ratio, I calculated mine out, and in order to achieve a 1.5:1 ratio, my barrel would have to be 35 inches long, so it doesnt seem very practical. But would you just gain more power from having a shorter barrel and a bigger chamber then?
  • 0

User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: hi » Sat Apr 14, 2007 4:17 pm

it would be a lot louder, but yes, it would probably increase the performance a little.
  • 0

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

Unread postAuthor: SpudBlaster15 » Sat Apr 14, 2007 5:05 pm

Boilingleadbath's salt mine analogy would appear to apply to miniature launchers with (relatively) large chambers, and short barrels.

That is, with such a large volume of fuel to burn in order to produce the same chamber pressure as would occur in a properly sized chamber, the projectile will exit the barrel long before the pressure has built to any reasonable level.
  • 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: Scotty » Sat Jun 16, 2007 11:36 pm

A properly constructed and sealed gun with a proper ratio with always give far better results than if you just build a massive chamber and whack on a crayola twist barrel. It's all about what Spudblaster said about the projectile having enough time to accelerate with the shockwave generated by the detonation (or burning) of the fuel, if your use a barrel that is too short it wont speed up enough, too long and it will start to slow down before it exits the barrel. Build your guns properly and you will enjoy them much much more, you would end up modifying it anyway in which case you will save time and money by doing it right the first time. Remember measure twice and cut once!

Peace
Scotty
P.S. Spud you are not insane- just remote fire it :twisted:
  • 0


Scotty
Staff Sergeant
Staff Sergeant
 
Posts: 114
Joined: Tue Jan 09, 2007 3:00 am
Reputation: 0

Return to Miniature Cannon Discussion

Who is online

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

Reputation System ©'