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 54 users online :: 5 registered, 0 hidden and 49 guests


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

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

Whats the best C:B ratio for a combustion Cannon?

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

Whats the best C:B ratio for a combustion Cannon?

Unread postAuthor: amentic » Wed Apr 12, 2006 10:44 pm

Im building my first combustion cannon and i got a 2" PVC pipe for my barrel and a 4" pipe for my chamber. I want my barrel to be 48" (4 feet) long and i was wondering what i should have my chamber cut to. I got it cut at 24" right now but i dont know if it should be any shorter. any suggestions?

I cut it at 24" cuz i heard that a 1:1 volume ratio was the best, but i also heard that 1.5:1 was best and also that .7:1 was best. its a big difference in length so i would like to know what anyone would think would work. Thanks guys. :shock:
  • 0


amentic
Private
Private
 
Posts: 3
Joined: Wed Apr 12, 2006 9:57 am
Location: Fargo ND
Reputation: 0

Unread postAuthor: iamthewalrus » Wed Apr 12, 2006 11:17 pm

i think u want about a 10" chamber
  • 0

i got connections with the modfia, watch who ur talkin to noob.


talk to me on AIM at iamthwalrus3
User avatar
iamthewalrus
Colonel
Colonel
 
Posts: 559
Joined: Mon Feb 28, 2005 9:28 pm
Location: Iowa (SO BORING!!)
Reputation: 0

Unread postAuthor: Rambo » Wed Apr 12, 2006 11:58 pm

Teoreticly the most efficient ratio is C:B 0.5:1 .This way the gun is very quiet.
  • 0

User avatar
Rambo
Colonel
Colonel
 
Posts: 509
Joined: Sun Jan 15, 2006 2:07 pm
Reputation: 0

Unread postAuthor: MisterSteve124 » Thu Apr 13, 2006 9:28 am

Why do people want the gun quiet? Thats one of the best parts the Big Boom.
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: FiveseveN » Thu Apr 13, 2006 5:03 pm

Some use their cannons in combat simulation (where you wouldn't like to give away your position) or in urban areas (some neighbours may not find the Big Boom quite as entertaining). To make it louder, make the ratio smaller than 0.8/1 and/or add a burst disk. A burst disk adds a lot of boom. Par example, in my gun it goes from "fart" to "firecracker" :lol:
Also, C:B ratios depend on fuel, altitude, temperature, ignition position etc. What works for some may not work for others.
  • 0

User avatar
FiveseveN
Captain
Captain
 
Posts: 337
Joined: Fri Oct 14, 2005 5:48 am
Location: Nowhere
Reputation: 0

Unread postAuthor: Shrimphead » Thu Apr 13, 2006 7:41 pm

Umm, ya Rambo, the most effecient is from .6:1-.8:1. A .5 c:b ratio will make it quieter but also less powerful.

@ Amentic- Trying to figure out the right ratio is only useful in two circumstances:
1. To find the best barrel length for a certain chamber size. If you already know how long you want your barrel to be, then just make sure that your chamber volume is at least 80% of your barrel volume.
2. To minimize the sound that the gun creates for the reasons that FiveseveN stated. If one were to make a tp gun, then they would want it to be quiet.
  • 0

Controlled insanity = Genius
Life flies when you're being dumb.
User avatar
Shrimphead
Colonel
Colonel
 
Posts: 509
Joined: Thu Nov 17, 2005 7:42 pm
Reputation: 0

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'