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 70 users online :: 6 registered, 0 hidden and 64 guests


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

Registered users: Bing [Bot], farcticox1, 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

Ignition height

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

Ignition height

Unread postAuthor: Scourch » Mon Jun 29, 2009 6:59 pm

How much of a difference would it make if my spark was higher in the combustion chamber then lower? If any at all.

One side of me is saying that the higher it is, the less pressure from the explosion there is from the spark point to the barrel. Then the other half of me is saying regardless of where the spark is, it will set of the gas all at once creating equal pressure. I don't know which side to believe lol. Help?
  • 0


Scourch
Private
Private
 
Posts: 6
Joined: Sun Jun 28, 2009 4:06 pm
Reputation: 0

Unread postAuthor: theBOOM » Mon Jun 29, 2009 7:48 pm

Well... id keep it in the middle of the chamber and in the middle of the diameter of your pipe... You should try to get as close to the radius as possible.. Im thinking that by doing this the "Explosion" can expand up and your chamber and across this way it would create 2 explosiones ... 1 going back and 1 going forth .... if your using a spark strip for ignition I would recommend you putting it in the middle :]

Just my thoughts

BOOM :twisted:
  • 0

User avatar
theBOOM
Major
Major
 
Posts: 374
Joined: Wed Jun 03, 2009 10:49 pm
Location: San Antonio, TX
Reputation: 0

Unread postAuthor: Scourch » Mon Jun 29, 2009 7:50 pm

Just a BBQ grill igniter crimped to some screws. Tested it out, spark is good. Just, it's up a little ways, a bit higher than the middle, I'd say.

I just would hate to have a poopy launch lol.
  • 0


Scourch
Private
Private
 
Posts: 6
Joined: Sun Jun 28, 2009 4:06 pm
Reputation: 0

Unread postAuthor: daberno123 » Mon Jun 29, 2009 8:46 pm

I highly doubt you'll be able to tell any difference unless you're shooting uniform projectiles over a chrony.
  • 0

User avatar
daberno123
Colonel
Colonel
 
Posts: 594
Joined: Mon Nov 19, 2007 5:56 pm
Location: Ohio
Reputation: 0

Unread postAuthor: starman » Tue Jun 30, 2009 3:08 am

Higher....lower??? What do you mean by that? Ideally keep them in the center of the chamber and equidistantly placed along its length. If you have 1 gap, place it in the center...2 gaps place them at the 1/4 mark and the 3/4 mark....3 gaps at the 1/6, center and 5/6 mark. These will allow the most efficient (fastest) simultaneous burning of the chamber with the spark sources available.
  • 0

User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Unread postAuthor: Scourch » Tue Jun 30, 2009 9:43 am

What I mean is, basically imagine a 2 foot long ABS pipe. Now I have two screws drilled into the pipe at an angle so that they come in to just barely meet, I don't know the gap distance but I do get a decent spark. Now just imagine where it is I have these screws screwed in on the pipe. Rather than it being more to the back of the chamber, say at the 1/4th mark, or even in the middle, it's a bit up someways. On a 2' pipe, we could assume the middle is at 1'. So my screws are drilled in approximately at the 1 1/2 mark or so.
  • 0


Scourch
Private
Private
 
Posts: 6
Joined: Sun Jun 28, 2009 4:06 pm
Reputation: 0

Return to Combustion Cannon Discussion

Who is online

Registered users: Bing [Bot], farcticox1, Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'